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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Oct. 19, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	VICR
Entity Registrant Name	VICOR CORP
Entity Central Index Key	0000751978
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Smaller Reporting Company	false
Emerging Growth Company	false
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		28,408,092
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,758,218

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 68,206	$ 44,230
Accounts receivable, less allowance of $252 in 2018 and $159 in 2017	45,052	34,487
Inventories, net	43,444	36,499
Other current assets	3,900	3,616
Total current assets	160,602	118,832
Long-term deferred tax assets, net	184	210
Long-term investments, net	2,613	2,525
Property, plant and equipment, net	41,465	41,356
Other assets	2,801	2,801
Total assets	207,665	165,724
Current liabilities:
Accounts payable	13,106	9,065
Accrued compensation and benefits	9,159	9,891
Accrued expenses	2,384	2,989
Sales allowances	567
Accrued severance and other charges	325
Income taxes payable	708	300
Deferred revenue	4,442	5,791
Total current liabilities	30,691	28,036
Long-term deferred revenue	249	303
Contingent consideration obligations	470	678
Long-term income taxes payable	195	195
Other long-term liabilities	100	93
Total liabilities	31,705	29,305
Commitments and contingencies (Note 12)
Vicor Corporation stockholders' equity:
Additional paid-in capital	192,373	181,395
Retained earnings	122,090	93,605
Accumulated other comprehensive loss	(516)	(478)
Treasury stock, at cost	(138,927)	(138,927)
Total Vicor Corporation stockholders' equity	175,540	136,114
Noncontrolling interest	420	305
Total equity	175,960	136,419
Total liabilities and equity	207,665	165,724
Class B Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	118	118
Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	$ 402	$ 401

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 252	$ 159

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net revenues	$ 78,035	$ 56,888	$ 217,500	$ 169,059
Cost of revenues	39,031	31,745	112,402	94,334
Gross margin	39,004	25,143	105,098	74,725
Operating expenses:
Selling, general and administrative	15,280	14,500	46,493	43,059
Research and development	10,691	10,543	33,220	33,482
Severance and other charges (credits)	(10)		340
Total operating expenses	25,961	25,043	80,053	76,541
Income (loss) from operations	13,043	100	25,045	(1,816)
Other income (expense), net:
Total unrealized gains on available-for-sale securities, net	32	34	88	91
Less: portion of gains recognized in other comprehensive income (loss)	(30)	(31)	(82)	(82)
Net credit gains recognized in earnings	2	3	6	9
Other income (expense), net	230	306	612	985
Total other income (expense), net	232	309	618	994
Income (loss) before income taxes	13,275	409	25,663	(822)
Less: Provision for income taxes	227	371	724	539
Consolidated net income (loss)	13,048	38	24,939	(1,361)
Less: Net income attributable to noncontrolling interest	36	49	124	83
Net income (loss) attributable to Vicor Corporation	$ 13,012	$ (11)	$ 24,815	$ (1,444)
Net income (loss) per common share attributable to Vicor Corporation:
Basic	$ 0.32	$ 0.00	$ 0.62	$ (0.04)
Diluted	$ 0.32	$ 0.00	$ 0.61	$ (0.04)
Shares used to compute net income (loss) per common share attributable to Vicor Corporation:
Basic	40,120	39,288	39,769	39,177
Diluted	41,124	39,288	40,645	39,177

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2018

Sep. 30, 2017

Statement of Comprehensive Income [Abstract]

Consolidated net income (loss)

$ 13,048

$ 38

$ 24,939

$ (1,361)

Foreign currency translation (losses) gains, net of tax

^[1]

(156)

(16)

(129)

Unrealized gains on available-for-sale securities, net of tax

^[1]

Other comprehensive income (loss)

(126)

(47)

170

Consolidated comprehensive income (loss)

12,922

24,892

(1,191)

Less: Comprehensive income attributable to noncontrolling interest

115

Comprehensive income (loss) attributable to Vicor Corporation

$ 12,897

$ 6

$ 24,777

$ (1,280)

[1]

The deferred tax assets associated with cumulative foreign currency translation gains and cumulative unrealized gains on available-for-sale securities are completely offset by a tax valuation allowance as of September 30, 2018 and 2017. Therefore, there is no income tax benefit (provision) recognized for the three and nine months ended September 30, 2018 and 2017.

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Recognized income tax benefit (provision)	$ 0	$ 0	$ 0	$ 0

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating activities:
Consolidated net income (loss)	$ 13,048	$ 38	$ 24,939	$ (1,361)
Adjustments to reconcile consolidated net income (loss) to net cash provided by operating activities:
Depreciation and amortization	2,331	2,244	6,870	6,590
Stock-based compensation expense, net	688	731	2,604	1,272
Provision for doubtful accounts			91	8
Decrease in long-term income taxes payable				(5)
Increase in other long-term liabilities			7	90
Decrease in long-term deferred revenue			(54)	(53)
Gain on disposal of equipment			(45)	(15)
Deferred income taxes			26	17
Credit gain on available-for-sale securities	(2)	(3)	(6)	(9)
Change in current assets and liabilities, net			(11,590)	(5,896)
Net cash provided by operating activities			22,842	638
Investing activities:
Additions to property, plant and equipment			(6,894)	(10,164)
Proceeds from sale of equipment			45	15
Increase in other assets			(92)	(17)
Net cash used for investing activities			(6,941)	(10,166)
Financing activities:
Proceeds from issuance of Common Stock			8,378	2,510
Payment of contingent consideration obligations			(208)	(175)
Net cash provided by financing activities			8,170	2,335
Effect of foreign exchange rates on cash			(95)	(41)
Net increase (decrease) in cash and cash equivalents			23,976	(7,234)
Cash and cash equivalents at beginning of period	44,230	56,170	44,230	56,170
Cash and cash equivalents at end of period	$ 68,206	$ 48,936	$ 68,206	$ 48,936

Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	1. Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of Vicor Corporation and its consolidated subsidiaries (collectively, the “Company”) have been prepared in accordance with generally accepted accounting principles for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, these interim financial statements do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for any other interim period or the year ending December 31, 2018. The balance sheet at December 31, 2017 presented herein has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 filed by the Company with the Securities and Exchange Commission on March 9, 2018 (“2017 Form 10-K”).

Recently Adopted Accounting Standard

9 Months Ended

Sep. 30, 2018

Text Block [Abstract]

Recently Adopted Accounting Standard

2. Recently Adopted Accounting Standard

In May 2014, the Financial Accounting Standards Board (“FASB”) issued new guidance for revenue recognition (“Topic 606”), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The new guidance, which includes several amendments, replaces most of the prior revenue recognition guidance under U.S. Generally Accepted Accounting Principles. The Company adopted the new guidance as of January 1, 2018 using the modified retrospective method, as applied to all contracts. As a result, the Company has changed its accounting policy for revenue recognition, as detailed below. The most significant impacts of the adoption were on the timing of recognition of sales to the Company’s stocking distributors and including the additional required disclosures under the new standard. Through December 31, 2017, the Company deferred revenue and the related cost of sales on shipments to stocking distributors until the distributors resold the products to their customers. Upon adoption, the Company is no longer permitted to defer revenue until sale by the stocking distributor to the end customer, but rather, is required to estimate the effects of returns and allowances provided to stocking distributors and record revenue at the time of sale to the stocking distributor. In addition, the Company modified the accounting for a contractual arrangement due to a reassessment of the number of performance obligations in the arrangement, and adjusted for the timing of certain royalty revenue. The cumulative effect of adopting this guidance, recorded as an increase to the balance of retained earnings as of January 1, 2018, was approximately $3,670,000. The comparative information for the three and nine months ended September 30, 2017, including disclosures, has not been restated and continues to be reported under the accounting standards in effect for that period.

The following tables summarize the impacts of adopting the new revenue recognition guidance on certain components of the Company’s condensed consolidated financial statements (in thousands):

a) Consolidated Balance Sheet Items


	As of September 30, 2018
	As reported		Adjustments			Balances without adoption of Topic 606
Accounts receivable, net	$	45,052	$	(24	)	$	45,028
Inventories, net		43,444		(128	)		43,316
Total assets		207,665		(152	)		207,513

Income taxes payable		708		(25	)		683
Deferred revenue		4,442		4,911			9,353
Sales allowances		567		(497	)		70
Total liabilities		31,705		4,389			36,094

Retained earnings		122,090		(4,541	)		117,549
Total equity		175,960		(4,541	)		171,419
Total liabilities and equity		207,665		(152	)		207,513

b) Consolidated Statement of Operations Items


	Three Months Ended September 30, 2018
	As reported		Adjustments			Balances without adoption of Topic 606
Net revenues	$	78,035	$	(1,026	)	$	77,009
Cost of revenues		39,031		(575	)		38,456

Gross margin		39,004		(451	)		38,553

Income before income taxes		13,275		(451	)		12,824
Provision for income taxes		227		(7	)		220
Consolidated net income		13,048		(444	)		12,604
Net income attributable to Vicor Corporation		13,012		(444	)		12,568

	Nine Months Ended September 30, 2018
	As reported		Adjustments			Balances without adoption of Topic 606
Net revenues	$	217,500	$	(2,427	)	$	215,073
Cost of revenues		112,402		(1,531	)		110,871

Gross margin		105,098		(896	)		104,202

Income before income taxes		25,663		(896	)		24,767
Provision for income taxes		724		(25	)		699
Consolidated net income		24,939		(871	)		24,068
Net income attributable to Vicor Corporation		24,815		(871	)		23,944

The impact of the adoption of the new revenue recognition standard on the unaudited consolidated statements of comprehensive income (loss) and cash flows for the three and nine months ended September 30, 2018 was not material.

Revenue Recognition

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue Recognition

3. Revenue Recognition

Prior to January 1, 2018

Product revenue was recognized in the period when persuasive evidence of an arrangement with a customer existed, the products were shipped and title was transferred to the customer, the price was fixed or determinable, and collection was considered probable.

The Company deferred revenue and the related cost of sales on shipments to stocking distributors until the distributors resold the products to their customers. The agreements with these stocking distributors allowed them to receive price adjustment credits or to return qualifying products for credit, as determined by the Company, in order to reduce the amounts of slow-moving, discontinued, or obsolete product from their inventory. These stocking distributors were also granted price adjustment credits in the event of a price decrease subsequent to the date the product was shipped and invoiced to the stocking distributor. Given the uncertainties associated with the levels of price adjustment credits to be granted to stocking distributors, the sales price to the stocking distributor was not fixed or determinable until the stocking distributor resold the products to its customers. Therefore,

the Company deferred revenue and the related cost of sales on shipments to stocking distributors until the stocking distributors resold the products to their customers. Accordingly, the Company’s revenue fully reflected end-customer purchases and was not impacted by stocking distributor inventory levels. Agreements with stocking distributors limited returns of qualifying product to the Company to a certain percentage of the value of the Company’s shipments to that stocking distributor during the prior quarter. In addition, stocking distributors were allowed to return unsold products if the Company terminated the relationship with the stocking distributor. Title to the inventory transferred to the stocking distributor at the time of shipment or delivery to the stocking distributor. Payment from the stocking distributors were due in accordance with the Company’s standard payment terms. These payment terms were not contingent upon the stocking distributors’ sale of the products to their end-customers. Upon title transfer to stocking distributors, the Company reduced inventory for the cost of goods shipped, the margin (i.e., revenues less cost of revenues) was recorded as deferred revenue, and an account receivable was recorded. As of December 31, 2017, the Company had gross deferred revenue of approximately $4,659,000 and gross deferred cost of revenues of approximately $2,135,000 under agreements with stocking distributors.

The Company evaluated revenue arrangements with potential multi-element deliverables to determine if there were more than one unit of accounting. A deliverable constituted a separate unit of accounting when it had standalone value and there were no customer-negotiated refund or return rights for the undelivered elements. The Company entered into arrangements containing multiple elements that could include a combination of non-recurring engineering services (“NRE”), prototype units, and production units. The Company determined NRE and prototype units represented one unit of accounting and production units represented a separate unit of accounting, based on an assessment of the respective standalone value. The Company deferred revenue recognition for NRE and prototype units until completion of the final milestone under the NRE arrangement, which was generally the delivery of the prototype. Recognition generally took place within six to twelve months of the initiation of the arrangement. Revenue for the production units was recognized upon shipment, consistent with other product revenue summarized above.

License fees were recognized as earned. The Company recognized revenue on such arrangements only when the contract was signed, the license term had begun, all obligations had been delivered to the customer, and collection was probable.

Subsequent to January 1, 2018

Revenue is recognized when control of the promised goods or services is transferred to a customer, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. Sales, value add, and other taxes collected concurrent with revenue-producing activities are excluded from revenue. The expected costs associated with product warranties continue to be recognized at the time product revenue is recognized. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of revenues.

The Company’s primary source of net revenue comes from the sale of products, which are modular power components and power systems for converting, regulating and controlling electric current. The principal customers for the Company’s power converters and systems are large original equipment manufacturers and the original design manufacturers and contract manufacturers serving them, and smaller, lower volume users, which are broadly distributed across several major market areas. The Company recognizes revenue for product sales at a point in time following the transfer of control of such products to the customer, which typically occurs upon shipment or delivery, depending on the terms of the underlying contract. As noted above, the Company previously deferred revenue and the related cost of revenues on shipments to stocking distributors until the distributors resold the products to their customers. The Company now records revenue for such transactions at the time of sale to the stocking distributor. The Company establishes sales allowances for estimated future product returns including distributor returns and price adjustment credits, primarily based upon historical and anticipated rates of product returns and allowances.

Certain contracts with customers contain multiple performance obligations, which typically may include a combination of NRE, prototype units, and production units. For these contracts, the individual performance obligations are accounted for separately if they are distinct. Generally, the Company has determined the NRE and prototype units represent one distinct performance obligation and the production units represent a separate distinct performance obligation. For such arrangements, revenue is allocated to each performance obligation based on its relative standalone selling price, based on prices charged to customers or using the expected cost plus a margin approach. The Company defers revenue recognition for NRE and prototype units until the point in time at which the final milestone under the NRE arrangement is completed and control is transferred to the customer, which is generally the delivery of the prototype. Revenue for production units is recognized upon shipment or delivery, consistent with product revenue summarized above.

The Company licenses its intellectual property under right to use licenses, in which royalties due to the Company are based upon a percentage of the licensee’s sales. The Company utilizes the exception under the revenue recognition guidance for the recognition of sales- or usage-based royalties, in which the royalties are not recognized until the later of when 1) the customer’s subsequent sales or usages occur, or 2) the performance obligation to which some or all of the sales- or usage-based royalty has been allocated is satisfied or partially satisfied.

Accounts receivable includes amounts billed and currently due from customers. The amounts due are stated at their estimated realizable value. The Company’s payment terms vary by the type and location of its customers and the products or services offered, although terms generally include a requirement of payment within 30 to 60 days. The Company maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments, based on assessments of customers’ credit-risk profiles and payment histories. If the financial condition of the Company’s customers were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required. The Company does not require collateral from its customers, although there have been circumstances when the Company has required cash in advance (i.e., a partial down-payment) to facilitate orders in excess of a customer’s established credit limit. To date, such amounts have not been material.

The Company records deferred revenue, which represents a contract liability, when cash payments are received or due in advance of performance under a contract with a customer. During the three and nine months ended September 30, 2018, under Topic 606, the Company recognized revenue of approximately $471,000 and $781,000, respectively, that was included in deferred revenue at the beginning of each respective period.

The Company applies the practical expedient allowed under the new guidance for the incremental costs of obtaining a contract for sales commissions, which are expensed when incurred because the amortization period is generally less than one year. These costs are included in selling, general and administrative expenses.

The Company also applies another practical expedient allowed under the new guidance and does not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.

The following tables present the Company’s net revenues disaggregated by geography based on the location of the customer, by reportable segment, (in thousands):


	Three Months Ended September 30, 2018
	BBU		VI Chip		Picor		Total
United States	$	20,508	$	8,265	$	887	$	29,660
Europe		7,013		1,119		68		8,200
Asia Pacific		22,136		11,252		5,326		38,714
All other		1,369		92		—		1,461

	$	51,026	$	20,728	$	6,281	$	78,035


	Nine Months Ended September 30, 2018
	BBU		VI Chip		Picor		Total
United States	$	55,794	$	24,035	$	1,873	$	81,702
Europe		16,615		2,861		249		19,725
Asia Pacific		64,223		33,544		14,566		112,333
All other		3,380		317		43		3,740

	$	140,012	$	60,757	$	16,731	$	217,500

The following tables present the Company’s net revenues disaggregated by the category of revenue, by reportable segment, (in thousands):


	Three Months Ended September 30, 2018
	BBU		VI Chip		Picor		Total
Direct customers, contract manufacturers and non-stocking distributors	$	44,269	$	17,853	$	5,655	$	67,777
Stocking distributors, net of sales allowances		6,236		1,254		519		8,009
Non-recurring engineering		513		1,604		90		2,207
Royalties		8		8		8		24
Other		—		9		9		18

	$	51,026	$	20,728	$	6,281	$	78,035


	Nine Months Ended September 30, 2018
	BBU		VI Chip		Picor		Total
Direct customers, contract manufacturers and non-stocking distributors	$	123,147	$	52,787	$	15,137	$	191,071
Stocking distributors, net of sales allowances		15,934		5,673		1,251		22,858
Non-recurring engineering		885		2,224		270		3,379
Royalties		46		46		46		138
Other		—		27		27		54

	$	140,012	$	60,757	$	16,731	$	217,500

The following table presents the changes in certain contract assets and (liabilities) (in thousands):


	September 30, 2018			December 31, 2017			Increase (decrease)
Accounts receivable	$	45,052		$	34,487		$	10,565
Deferred revenue		(2,735	)		(5,015	)		2,280
Deferred expenses		315			377			(62	)
Customer prepayments		(1,707	)		(776	)		(931	)
Sales allowances		(567	)		—			(567	)

The increase in accounts receivable was primarily due to an increase in net revenues of approximately $19,264,000 in the third quarter of 2018 compared to the fourth quarter of 2017. The decrease in deferred revenue was primarily due to the adoption of the new revenue recognition guidance, as the balances related to stocking distributors were reversed as part of the transition adjustment recorded as of January 1, 2018 (see Note 2 to the Condensed Consolidated Financial Statements). The increase in sales allowances was due to the establishment of new allowances, in connection with the new revenue recognition guidance, for potential returns and price adjustment credits on sales to stocking distributors.

Deferred expenses are included in Other current assets, and customer prepayments are included in Deferred revenue, in the accompanying Condensed Consolidated Balance Sheets, respectively.

Long-Term Investments

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Long-Term Investments

4. Long-Term Investments

As of September 30, 2018 and December 31, 2017, the Company held one auction rate security with a par value of $3,000,000, purchased through and held in custody by a broker-dealer affiliate of Bank of America, N.A., that has experienced failed auctions (the “Failed Auction Security”) since February 2008. The Failed Auction Security held by the Company is Aaa/AA+ rated by major credit rating agencies, is collateralized by student loans, and is guaranteed by the U.S. Department of Education under the Federal Family Education Loan Program. Management is not aware of any reason to believe the issuer of the Failed Auction Security is presently at risk of default. Through September 30, 2018, the Company has continued to receive interest payments on the Failed Auction Security in accordance with the terms of its indenture. Management believes the Company ultimately should be able to liquidate the Failed Auction Security without significant loss primarily due to the overall quality of the issue held and the collateral securing the substantial majority of the underlying obligation. However, current conditions in the auction rate securities market have led management to conclude the recovery period for the Failed Auction Security exceeds 12 months. As a result, the Company continued to classify the Failed Auction Security as long-term as of September 30, 2018.

The following is a summary of available-for-sale securities (in thousands):


September 30, 2018	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Failed Auction Security	$	3,000	$	—	$	387	$	2,613


December 31, 2017	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Failed Auction Security	$	3,000	$	—	$	475	$	2,525

As of September 30, 2018, the Failed Auction Security had been in an unrealized loss position for greater than 12 months.

The cost and estimated fair value of the Failed Auction Security on September 30, 2018, by contractual maturity, is shown below (in thousands):


	Cost		Estimated Fair Value
Due in twenty to forty years	$	3,000	$	2,613

Based on the fair value measurements described in Note 5, the fair value of the Failed Auction Security on September 30, 2018, with a par value of $3,000,000, was estimated by the Company to be approximately $2,613,000. The gross unrealized loss of $387,000 on the Failed Auction Security consists of two types of estimated loss: an aggregate credit loss of $42,000 and an aggregate temporary impairment of $345,000. In determining the amount of credit loss, the Company compared the present value of cash flows expected to be collected to the amortized cost basis of the security, considering credit default risk probabilities and changes in credit ratings as significant inputs, among other factors (See Note 5).

The following table represents a rollforward of the activity related to the credit loss recognized in earnings on the Failed Auction Security for the nine months ended September 30 (in thousands):


	2018			2017
Balance at the beginning of the period	$	48		$	59
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized		(6	)		(9	)

Balance at the end of the period	$	42		$	50

At this time, the Company has no intent to sell the impaired Failed Auction Security and does not believe it is more likely than not the Company will be required to sell this security. If current market conditions deteriorate further, the Company may be required to record additional unrealized losses. If the credit rating of the security deteriorates, the Company may be required to adjust the carrying value of the investment through impairment charges recorded in the Condensed Consolidated Statements of Operations, and any such impairment adjustments may be material.

Based on the Company’s ability to access cash and cash equivalents and its expected operating cash flows, management does not anticipate the current lack of liquidity associated with the Failed Auction Security held will affect the Company’s ability to execute its current operating plan.

Fair Value Measurements

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

5. Fair Value Measurements

The Company accounts for certain financial assets at fair value, defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions market participants would use in pricing an asset or liability. A three-level hierarchy is used to show the extent and level of judgment used to estimate fair value measurements.

Assets and liabilities measured at fair value on a recurring basis included the following as of September 30, 2018 (in thousands):


	Using
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value as of September 30, 2018
Cash equivalents:
Money market funds	$	9,542	$	—	$	—		$	9,542
Long-term investments:
Failed Auction Security		—		—		2,613			2,613
Liabilities:
Contingent consideration obligations		—		—		(470	)		(470	)

Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 2017 (in thousands):


	Using
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value as of December 31, 2017
Cash equivalents:
Money market funds	$	9,279	$	—	$	—		$	9,279
Long-term investments:
Failed Auction Security		—		—		2,525			2,525
Liabilities:
Contingent consideration obligations		—		—		(678	)		(678	)

As of September 30, 2018, there was insufficient observable auction rate security market information available to determine the fair value of the Failed Auction Security using Level 1 or Level 2 inputs. As such, the Company’s investment in the Failed Auction Security was deemed to require valuation using Level 3 inputs. Management, after consulting with advisors, valued the Failed Auction Security using analyses and pricing models similar to those used by market participants (i.e., buyers, sellers, and the broker-dealers responsible for execution of the Dutch auction pricing mechanism by which each issue’s interest rate was set). Management utilized a probability weighted discounted cash flow (“DCF”) model to determine the estimated fair value of this security as of September 30, 2018. The major assumptions used in preparing the DCF model were similar to those described in Note 5 — Fair Value Measurements in the Notes to the Consolidated Financial Statements contained in the Company’s 2017 Form 10-K.

Quantitative information about Level 3 fair value measurements as of September 30, 2018 is as follows (dollars in thousands):


	Fair Value		Valuation Technique		Unobservable Input	Weighted Average
Failed Auction Security	$	2,613		Discounted cash flow	Cumulative probability of earning the maximum rate until maturity		0.06	%
					Cumulative probability of principal return prior to maturity		94.80	%
					Cumulative probability of default		5.15	%
					Liquidity risk premium		5.00	%
					Recovery rate in default		40.00	%

The change in the estimated fair value calculated for the investment valued on a recurring basis utilizing Level 3 inputs (i.e., the Failed Auction Security) for the nine months ended September 30, 2018 was as follows (in thousands):


Balance at the beginning of the period	$	2,525
Credit gain on available-for-sale securities included in Other income (expense), net		6
Gain included in Other comprehensive income		82

Balance at the end of the period	$	2,613

The Company has classified its contingent consideration obligations as Level 3 because the fair value for these liabilities was determined using unobservable inputs. The liabilities were based on estimated sales of legacy products over the period of royalty payments at the royalty rate, discounted using the Company’s estimated cost of capital.

The change in the estimated fair value calculated for the liabilities valued on a recurring basis utilizing Level 3 inputs (i.e., the Contingent consideration obligations) for the nine months ended September 30, 2018 was as follows (in thousands):


Balance at the beginning of the period	$	678
Payments		(208	)

Balance at the end of the period	$	470

There were no transfers between Level 1 and Level 2 of the fair value hierarchy during the nine months ended September 30, 2018.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Stock-Based Compensation

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

6. Stock-Based Compensation

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards and awards granted under the Vicor Corporation 2017 Employee Stock Purchase Plan (“ESPP”) as of their grant date. Stock-based compensation expense was as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of revenues	$	58	$	53	$	173	$	125
Selling, general and administrative		474		466		1,973		861
Research and development		156		212		458		286

Total stock-based compensation	$	688	$	731	$	2,604	$	1,272

The increase in stock-based compensation between the nine-month periods ended September 30, 2018 and 2017 was due to an increase in stock options granted between July 1, 2017 and September 30, 2018.

Compensation expense by type of award was as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Stock options	$	503	$	689	$	2,101	$	1,230
ESPP		185		42		503		42

Total stock-based compensation	$	688	$	731	$	2,604	$	1,272

Net Income (Loss) per Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Net Income (Loss) per Share

7. Net Income (Loss) per Share

The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share amounts):


	Three Months Ended September 30,					Nine Months Ended September 30,
	2018		2017			2018		2017
Numerator:
Net income (loss) attributable to Vicor Corporation	$	13,012	$	(11	)	$	24,815	$	(1,444	)

Denominator:
Denominator for basic net income (loss) per share-weighted average shares (1)		40,120		39,288			39,769		39,177
Effect of dilutive securities:
Employee stock options (2)		1,004		—			876		—

Denominator for diluted net income (loss) per share — adjusted weighted-average shares and assumed conversions		41,124		39,288			40,645		39,177

Basic net income (loss) per share	$	0.32	$	(0.00	)	$	0.62	$	(0.04	)

Diluted net income (loss) per share	$	0.32	$	(0.00	)	$	0.61	$	(0.04	)

(1)	Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.

(2)

Options to purchase 54,818 and 47,573 shares of Common Stock for the three and nine months ended September 30, 2018, respectively, and 1,452,808 shares of Common Stock for the three and nine months ended September 30, 2017, respectively, were not included in the calculation of net income (loss) per share as the effect would have been antidilutive.

Inventories

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Inventories

8. Inventories

Inventories are valued at the lower of cost (determined using the first-in, first-out method) or net realizable value. Fixed production overhead is allocated to the inventory cost per unit based on the normal capacity of the production facilities. Abnormal production costs, including fixed cost variances from normal production capacity, if any, are charged to cost of revenues in the period incurred. All shipping and handling costs incurred in connection with the sale of products are included in cost of revenues.

The Company provides reserves for inventories estimated to be excess, obsolete or unmarketable. The Company’s estimation process for assessing net realizable value is based upon its known backlog, projected future demand, historical consumption and expected market conditions. If the Company’s estimated demand and/or market expectation were to change or if product sales were to decline, the Company’s estimation process may cause larger inventory reserves to be recorded, resulting in larger charges to cost of revenues.

Inventories were as follows (in thousands):


	September 30, 2018		December 31, 2017
Raw materials	$	34,328	$	27,400
Work-in-process		3,864		3,596
Finished goods		5,252		5,503

Net balance	$	43,444	$	36,499

Product Warranties

9 Months Ended

Sep. 30, 2018

Guarantees and Product Warranties [Abstract]

Product Warranties

9. Product Warranties

The Company generally offers a two-year warranty for all of its products, though it has extended the warranty period to three years for certain military grade products sold after January 1, 2017. The Company is party to a limited number of supply agreements with certain customers contractually committing the Company to warranty and indemnification requirements exceeding those to which the Company has been exposed in the past. The Company provides for the estimated cost of product warranties at the time product revenue is recognized. Factors influencing the Company’s warranty reserves include the number of units sold, historical and anticipated rates of warranty returns, and the cost per return. The Company periodically assesses the adequacy of warranty reserves and adjusts the amounts as necessary. Warranty obligations are included in “Accrued expenses” in the accompanying Condensed Consolidated Balance Sheets.

Product warranty activity was as follows (in thousands):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Balance at the beginning of the period	$	326		$	244		$	290		$	214
Accruals for warranties for products sold in the period		6			126			139			321

Fulfillment of warranty obligations		(17	)		(82	)		(94	)		(179	)
Revisions of estimated obligations		(58	)		—			(78	)		(68	)

Balance at the end of the period	$	257		$	288		$	257		$	288

Severance and Other Charges	9 Months Ended
Severance and Other Charges	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Severance and Other Charges	10. Severance and Other Charges In May 2018, the Company’s management authorized the closure of its Granite Power Technologies, Inc. (“GPT”) subsidiary, of the Brick Business Unit (“BBU”) segment, by the end of 2018. GPT, located in Manchester, N.H., is one of three Vicor Custom Power (“VCP”) entities. Certain of GPT’s products will continue to be manufactured and sold by the two remaining VCP entities. As a result, the Company recorded a pre-tax charge of $350,000 in the second quarter of 2018, for the cost of severance and other employee-related costs involving cash payments based on each employee’s respective length of service. This was recorded as “Severance and other charges” in the Condensed Consolidated Statement of Operations. The related liability is presented as “Accrued severance and other charges” in the Condensed Consolidated Balance Sheets. Adjustments to reduce the liability recorded during the third quarter of 2018 were due to certain GPT employees accepting positions with Vicor, severance payments made to employees who have left GPT after the authorization of the closure, and to increase the liability for an early termination fee under GPT’s lease.

Income Taxes

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

11. Income Taxes

The tax provision is based on the estimated annual effective tax rate for the year, which includes estimated federal, state and foreign income taxes on the Company’s projected pre-tax income (loss).

The provision for income taxes and the effective income tax rates were as follows (dollars in thousands):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Provision for income taxes	$	227		$	371		$	724		$	539
Effective income tax rate		1.7	%		90.7	%		2.8	%		65.6	%

The effective tax rate was lower than the statutory tax rate in 2018 due to the utilization of net operating carryforwards and tax credits that were previously fully reserved. The provisions for income taxes in each 2017 period were primarily due to estimated foreign income taxes and for estimated state taxes in jurisdictions in which the Company does not have net operating loss carryforwards. No tax benefit could be recognized for the majority of the Company’s losses during the 2017 periods due to a full valuation allowance against all net domestic deferred tax assets.

On December 22, 2017, the U.S. government enacted comprehensive tax legislation, referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act makes broad and complex changes to the U.S. tax code, including, but not limited to: (1) reducing the U.S. federal corporate tax rate from 35% to 21%; (2) elimination of the corporate alternative minimum tax (“AMT”) and changing how existing AMT credits can be realized; (3) changing rules related to the usage and limitation of net operating loss carryforwards created in tax years beginning after December 31, 2017; and (4) implementing a territorial tax system, which generally eliminates the U.S. federal income tax on dividends from foreign subsidiaries, and imposes a one-time transition tax on certain earnings of foreign subsidiaries previously untaxed in the United States.

Certain impacts of the Tax Act would generally require accounting to be completed in the period of enactment. However, in response to the complexities of the Tax Act, the Securities and Exchange Commission (“SEC”) issued guidance through Staff Accounting Bulletin No. 118 to provide companies with relief. Specifically, when the initial accounting for items under the Tax Act is incomplete, the guidance allows companies to include provisional amounts when reasonable estimates can be made. The SEC has provided up to a one-year measurement period for companies to finalize the accounting for the impact of the new legislation and the Company expects to finalize the accounting in the fourth quarter. The Company has recognized the provisional tax impacts related to the re-measurement ofits deferred tax assets and liabilities, and one-time transition tax, for the year ended December 31, 2017. The ultimate impact may differ from these provisional amounts due to, among other things, additional analysis, changes in interpretations and assumptions the Company has made, additional regulatory guidance that may be issued, and actions the Company may take as a result of the Tax Act. There have been no material changes to the provisional tax impacts referred to above during 2018.

As of September 30, 2018, the Company continues to maintain a valuation allowance of approximately $28,541,000 against all domestic net deferred tax assets. Management assesses the need for the valuation allowance on a quarterly basis. In assessing the need for a valuation allowance, the Company considers all positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax planning strategies, and past financial performance. Due to improving financial results, the Company may release all or a portion of the valuation allowance in the near-term. The release of the valuation allowance, however, as well as the exact timing and the amount of such release continues to be subject to, among other things, the Company’s level of profitability, revenue growth, and expectations regarding future profitability. Since the Company was in a significant cumulative loss position as of December 31, 2017, and until actual operating results continue to be consistently positive, it will continue to maintain the full valuation allowance on its domestic deferred tax assets. If and when the Company determines the valuation allowance should be released (i.e., reduced), the adjustment would result in a tax benefit reported in that period’s consolidated statements of operations, the effect of which would be an increase in reported net income, and the adjustment could likely be material.

In May 2017, the Company received notice from the Internal Revenue Service that its federal corporate tax return for tax year 2015 had been selected for examination. The examination was completed in May 2018 resulting in no tax liability to the Company. In January 2018, the Company received notice from the New York State Department of Taxation that its New York State tax returns for tax years 2014 through 2016 were selected for audit. The audit was completed in the third quarter of 2018, resulting in an immaterial assessment.

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	12. Commitments and Contingencies At September 30, 2018, the Company had approximately $9,512,000 of capital expenditure commitments. The Company is the defendant in a patent infringement lawsuit originally filed on January 28, 2011 by SynQor, Inc. (“SynQor”) in the U.S. District Court for the Eastern District of Texas (the “Texas Action”). The complaint, as amended in September 2011, alleges that the Company’s products, including but not limited to, unregulated bus converters used in intermediate bus architecture power supply systems, infringe SynQor’s U.S. patent numbers 7,072,190, 7,272,021, 7,564,702, and 8,023,290 (“the ‘190 patent”, “the ‘021 patent”, “the ‘702 patent”, and “the ‘290 patent”, respectively). SynQor’s complaint sought an injunction against further infringement and an award of unspecified compensatory and enhanced damages, interest, costs and attorney fees. The Company has denied that its products infringe any of the SynQor patents, asserted that the SynQor patents are invalid, and asserted that the ‘290 patent is unenforceable due to inequitable conduct by SynQor or its agents during the examination of the ‘290 patent at the United States Patent and Trademark Office (“USPTO”). The Company also asserted counterclaims seeking damages against SynQor for deceptive trade practices and tortious interference with prospective economic advantage arising from SynQor’s attempted enforcement of its patents against the Company. On May 23, 2016, after extensive discovery, the Texas Action was stayed by the court pending completion of certain inter partes reexamination proceedings at the USPTO (including any appeals from such proceedings to the Federal Circuit (as defined below)) concerning the SynQor patents, which are described below. In response to the Texas Action, the Company initiated inter partes reexamination proceedings at the USPTO challenging the validity of certain claims of the SynQor patents asserted in the Texas Action, including all claims that were asserted against the Company by SynQor. The current status of these proceedings is as follows. Regarding the ‘190 patent, the United States Court of Appeals for the Federal Circuit (the “Federal Circuit”) issued a decision on March 13, 2015, determining that certain claims were invalid, and remanding the matter to the Patent Trial and Appeal Board (“PTAB”) of the USPTO for further proceedings. On May 2, 2016, the PTAB issued a decision determining that all but one of the remaining claims of the ‘190 patent were invalid and remanding the remaining claim to a patent examiner for further examination. On June 22, 2017, the examiner issued a determination under 37 C.F.R. § 41.77(d), finding that the remaining claim of the ‘190 patent was unpatentable. That decision is expected to be further reviewed by the PTAB pursuant to 37 C.F.R. § 41.77(f). On May 2, 2016, the PTAB also issued decisions finding all challenged claims of SynQor’s ‘021 patent invalid and upholding the validity of all challenged claims of SynQor’s ‘702 and ‘290 patents. On August 30, 2017, the Federal Circuit issued rulings with regard to PTAB’s reexamination decisions for the ‘021, ‘702 and ‘290 patents. With respect to the ‘021 patent, the Federal Circuit affirmed the PTAB’s determination that all of the challenged claims of the ‘021 patent were invalid. The Federal Circuit remanded the case to the PTAB for further consideration of the patentability of certain claims that had been added by amendment during the reexamination. With respect to the ‘702 patent, the Federal Circuit affirmed the PTAB’s determination that all of the challenged claims of the ‘702 patent were patentable. With respect to the ‘290 patent, the Federal Circuit vacated the PTAB’s decision upholding the patentability of the ‘290 patent claims, and remanded the case to the PTAB for further consideration. On October 31, 2017, the Company filed a request with the USPTO for ex parte reexamination of the ‘702 patent, based on different prior art references than had been at issue in the previous inter partes reexamination of the ‘702 patent. On December 6, 2017, the USPTO issued a decision granting the Company’s request and initiating ex parte reexamination of the ‘702 patent. On March 21, 2018, the USPTO issued a non-final office action finding all of the challenged claims of the ‘702 patent to be unpatentable. On May 14, 2018, SynQor filed a petition asking the USPTO to vacate its prior decision granting the Company’s request for ex parte reexamination. No action has been taken on the petition to date. On September 12, 2018, the USPTO issued a final office action finding all of the challenged claims of the ‘702 patent to be unpatentable. The Company continues to monitor the progress of this proceeding. On August 6, 2018, the Company filed a request with the USPTO for ex parte reexamination of the ‘190 patent, based on different prior art references than had been at issue in the previous inter partes reexamination of the ‘190 patent. On September 11, 2018, SynQor filed a petition asking the USPTO to reject the Company’s request on the ground that it presented substantially the same prior art or arguments presented to the USPTO in the prior Inter Partes Reexamination of the ‘190 patent. There have been no substantive actions taken in this reexamination proceeding to date. The Company continues to believe none of its products, including its unregulated bus converters, infringe any valid claim of the asserted SynQor patents, either alone or when used in an intermediate bus architecture implementation. The Company believes SynQor’s claims lack merit and, therefore, continues to vigorously defend itself against SynQor’s patent infringement allegations. The Company does not believe a loss is probable for this matter. If a loss were to be incurred, however, the Company cannot estimate the amount of possible loss or range of possible loss at this time. In addition to the SynQor matter, the Company is involved in certain other litigation and claims incidental to the conduct of its business. While the outcome of lawsuits and claims against the Company cannot be predicted with certainty, management does not expect any current litigation or claims will have a material adverse impact on the Company’s financial position or results of operations.

Picor Merger	9 Months Ended
Picor Merger	Sep. 30, 2018
Business Combinations [Abstract]
Picor Merger	13. Picor Merger On May 25, 2018, the Company’s Board of Directors unanimously approved the merger of the Company with Picor Corporation (“Picor”), a subsidiary of Vicor, fully consolidated for financial reporting purposes, in which the Company was the majority stockholder. The merger was completed as of May 30, 2018, at which time the separate corporate existence of Picor ceased. To effect the merger, holders of Picor Common Stock and Picor stock options received an equivalent value of Vicor Common Stock and Vicor stock options, respectively, which caused the Picor Corporation Amended and Restated 2001 Stock Option and Incentive Plan, and options outstanding thereunder, to be assumed and restated by Vicor. While Picor’s subsidiary status and corporate form ceased to exist upon the closing of the merger, the operations previously conducted by Picor, which are now conducted by Vicor, continue to be managed and remain categorized as a segment for financial reporting purposes. There was no net impact on the Company’s consolidated financial statements nor any impact on the Company’s segment reporting for the three and nine months ended September 30, 2018 as a result of the merger.

Segment Information

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Segment Information

14. Segment Information

The Company has organized its business segments according to its key product lines. The BBU segment designs, develops, manufactures, and markets the Company’s legacy lines of DC-DC converters and configurable products, and also includes the entities comprising Vicor Custom Power and the BBU operations of Vicor Japan Company, Ltd. (“VJCL”). The VI Chip segment includes VI Chip Corporation, which designs, develops, manufactures, and markets many of the Company’s advanced power component products. The VI Chip segment also includes the VI Chip business conducted in Japan through VJCL. The Picor segment, which consists of the operations of the Company’s former subsidiary Picor Corporation (see Note 13, above), designs, develops, manufactures, and markets integrated circuits for use in a variety of power management and power system applications. The Picor segment develops integrated circuits for use in the Company’s BBU and VI Chip modules, to be sold as complements to the Company’s BBU and VI Chip products, or for sale to third parties for separate (i.e., stand-alone) applications.

The Company’s Chief Executive Officer (i.e., the chief operating decision maker) evaluates performance and allocates resources based on segment revenues and segment operating income (loss). The operating income (loss) for each segment includes selling, general, and administrative and research and development expenses directly attributable to the segment. Certain of the Company’s indirect overhead costs, which include corporate selling, general, and administrative expenses, are allocated among the segments based upon an estimate of costs associated with each segment. Assets allocated to each segment are based upon specific identification of such assets, which include accounts receivable, inventories, fixed assets and certain other assets. The Corporate segment consists of those operations and assets shared by all segments. The costs of certain centralized executive and administrative functions are recorded in this segment, as are certain shared assets, most notably cash and cash equivalents, deferred tax assets, long-term investments, the Company’s facilities in Massachusetts, real estate, and other assets. The Company’s accounting policies and method of presentation for segments are consistent with that used throughout the Condensed Consolidated Financial Statements.

The following table provides segment financial data as of and for the three months ended September 30 (in thousands):


	BBU		VI Chip			Picor		Corporate			Eliminations (1)			Total
2018:
Net revenues	$	51,026	$	21,525		$	8,587	$	—		$	(3,103	)	$	78,035
Income (loss) from operations		10,444		1,304			1,579		(284	)		—			13,043
Total assets		268,520		44,262			13,500		83,865			(202,482	)		207,665
Depreciation and amortization		858		913			200		360			—			2,331

2017:
Net revenues	$	38,529	$	14,745		$	6,360	$	—		$	(2,746	)	$	56,888
Income (loss) from operations		2,007		(2,952	)		1,359		(314	)		—			100
Total assets		227,408		33,021			11,934		64,864			(171,151	)		166,076
Depreciation and amortization		971		712			188		373			—			2,244

The following table provides segment financial data as of and for the nine months ended September 30 (in thousands):


	BBU		VI Chip			Picor		Corporate			Eliminations (1)			Total
2018:
Net revenues	$	140,012	$	63,125		$	25,983	$	—		$	(11,620	)	$	217,500
Income (loss) from operations		16,710		3,669			6,037		(1,371	)		—			25,045
Total assets		268,520		44,262			13,500		83,865			(202,482	)		207,665
Depreciation and amortization		2,652		2,560			587		1,071			—			6,870

2017:
Net revenues	$	115,141	$	42,835		$	19,553	$	—		$	(8,470	)	$	169,059
Income (loss) from operations		5,962		(10,761	)		3,825		(842	)		—			(1,816	)
Total assets		227,408		33,021			11,934		64,864			(171,151	)		166,076
Depreciation and amortization		2,944		2,000			558		1,088			—			6,590

(1)

The elimination for net revenues is principally related to inter-segment sales by Picor to BBU and VI Chip and for inter-segment sales by VI Chip to BBU. The elimination for total assets is principally related to inter-segment accounts receivable due to BBU for the funding of VI Chip and Picor operations.

Impact of Recently Issued Accounting Standards	9 Months Ended
Impact of Recently Issued Accounting Standards	Sep. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Impact of Recently Issued Accounting Standards	15. Impact of Recently Issued Accounting Standards In August 2018, the Financial Accounting Standards Board (“FASB”) issued guidance which modifies the disclosure requirements on fair value measurements under Topic 820, Fair Value Measurements (“Topic 820”). Certain disclosure requirements under Topic 820 were removed, others modified, and certain disclosures have been added. The changes that will impact the Company primarily pertain to those affecting Level 3 fair value measurements. The new guidance is effective for all entities for annual and interim periods in fiscal years beginning after December 15, 2019, with early adoption permitted. It is required to be applied on a retrospective approach with certain elements being adopted prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. The Company has not yet determined the impact this new guidance will have on its consolidated financial statements and related disclosures. In June 2018, the FASB issued new guidance, Improvements to Nonemployee Share-Based Payment Accounting, which more closely aligns the accounting for share-based payments to non-employees with the accounting for share-based payments to employees. This new guidance is effective for public business entities for annual and interim periods in fiscal years beginning after December 15, 2018, with early adoption permitted. The Company early-adopted the new standard on July 1, 2018. The adoption of this new guidance did not have a material impact on its consolidated financial statements and related disclosures. In May 2017, the FASB issued guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718, Compensation — Stock Compensation. The new guidance is effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted. The Company adopted the new standard on January 1, 2018. The adoption of this new guidance did not have a material impact on its consolidated financial statements and related disclosures. In August 2016, the FASB issued guidance to clarify how certain cash receipts and cash payments should be presented in the statement of cash flows. These include debt prepayment, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, distributions received from equity method investees and beneficial interests in securitization transactions. The new guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. The Company adopted the new standard on January 1, 2018. The adoption of this new guidance did not have a material impact on its consolidated financial statements and related disclosures. In June 2016, the FASB issued new guidance which will require measurement and recognition of expected credit losses on certain types of financial instruments. It also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The new guidance is effective for interim and annual reporting periods beginning after December 15, 2019, with early adoption permitted. It is required to be applied on a modified-retrospective approach with certain elements being adopted prospectively. The Company does not expect the adoption of the new guidance will have a material impact on its consolidated financial statements and related disclosures. Lease Accounting In February 2016, the FASB issued new guidance for lease accounting, which will require lessees to recognize leases on the balance sheet and disclose key information about leasing arrangements. The new guidance establishes a right-of-use model (“ROU”) that will require a lessee to recognize a ROU asset and a lease liability on the balance sheet for all leases with a term longer than twelve months. Leases will be classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the income statement. For lessors, the guidance modifies the classification criteria and accounting for sales-type and direct financing leases. The majority of the Company’s leases are for certain of its office and manufacturing space. The Company is a party to one arrangement as the lessor, for its former Westcor facility located in Sunnyvale, California. The new standard is effective for the Company as of January 1, 2019, with early adoption permitted. The Company plans to adopt the new guidance on its effective date. The new standard must be adopted using a modified retrospective transition approach, applying the guidance to all leases existing at the date of initial application. An entity may choose to use either (1) its effective date or (2) the beginning of the earliest comparative period presented in the financial statements as its date of application. The Company plans to adopt the new standard on January 1, 2019 and use the effective date as our date of initial application. As a result, financial information will not be updated and the disclosures required under the new standard will not be provided for dates and periods before January 1, 2019. The new standard provides a number of optional practical expedients. The Company expects to elect the ‘package of practical expedients’, which permits companies to not reassess under the new standard lease identification, lease classification and initial direct costs. The Company does not plan to elect the use-of-hindsight or the practical expedient pertaining to land easements, the latter not being applicable. The Company has developed an implementation plan and continues to gather information, including compiling an inventory of all leasing arrangements and performing initial calculations, to assess the impact of the new standard on its financial statements. While the Company believes this new standard will have a material impact on the financial statements, particularly the balance sheet and disclosures, a quantification of the potential impact has not yet been completed. Other new pronouncements issued but not effective until after September 30, 2018 are not expected to have a material impact on the Company’s consolidated financial statements.

Recently Adopted Accounting Standard (Policies)	9 Months Ended
Recently Adopted Accounting Standard (Policies)	Sep. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Recently Adopted Accounting Standard	2. Recently Adopted Accounting Standard In May 2014, the Financial Accounting Standards Board (“FASB”) issued new guidance for revenue recognition (“Topic 606”), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The new guidance, which includes several amendments, replaces most of the prior revenue recognition guidance under U.S. Generally Accepted Accounting Principles. The Company adopted the new guidance as of January 1, 2018 using the modified retrospective method, as applied to all contracts. As a result, the Company has changed its accounting policy for revenue recognition, as detailed below. The most significant impacts of the adoption were on the timing of recognition of sales to the Company’s stocking distributors and including the additional required disclosures under the new standard. Through December 31, 2017, the Company deferred revenue and the related cost of sales on shipments to stocking distributors until the distributors resold the products to their customers. Upon adoption, the Company is no longer permitted to defer revenue until sale by the stocking distributor to the end customer, but rather, is required to estimate the effects of returns and allowances provided to stocking distributors and record revenue at the time of sale to the stocking distributor. In addition, the Company modified the accounting for a contractual arrangement due to a reassessment of the number of performance obligations in the arrangement, and adjusted for the timing of certain royalty revenue. The cumulative effect of adopting this guidance, recorded as an increase to the balance of retained earnings as of January 1, 2018, was approximately $3,670,000. The comparative information for the three and nine months ended September 30, 2017, including disclosures, has not been restated and continues to be reported under the accounting standards in effect for that period.
Impact of Recently Issued Accounting Standards	In August 2018, the Financial Accounting Standards Board (“FASB”) issued guidance which modifies the disclosure requirements on fair value measurements under Topic 820, Fair Value Measurements (“Topic 820”). Certain disclosure requirements under Topic 820 were removed, others modified, and certain disclosures have been added. The changes that will impact the Company primarily pertain to those affecting Level 3 fair value measurements. The new guidance is effective for all entities for annual and interim periods in fiscal years beginning after December 15, 2019, with early adoption permitted. It is required to be applied on a retrospective approach with certain elements being adopted prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. The Company has not yet determined the impact this new guidance will have on its consolidated financial statements and related disclosures. In June 2018, the FASB issued new guidance, Improvements to Nonemployee Share-Based Payment Accounting, which more closely aligns the accounting for share-based payments to non-employees with the accounting for share-based payments to employees. This new guidance is effective for public business entities for annual and interim periods in fiscal years beginning after December 15, 2018, with early adoption permitted. The Company early-adopted the new standard on July 1, 2018. The adoption of this new guidance did not have a material impact on its consolidated financial statements and related disclosures. In May 2017, the FASB issued guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718, Compensation — Stock Compensation. The new guidance is effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted. The Company adopted the new standard on January 1, 2018. The adoption of this new guidance did not have a material impact on its consolidated financial statements and related disclosures. In August 2016, the FASB issued guidance to clarify how certain cash receipts and cash payments should be presented in the statement of cash flows. These include debt prepayment, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, distributions received from equity method investees and beneficial interests in securitization transactions. The new guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. The Company adopted the new standard on January 1, 2018. The adoption of this new guidance did not have a material impact on its consolidated financial statements and related disclosures. In June 2016, the FASB issued new guidance which will require measurement and recognition of expected credit losses on certain types of financial instruments. It also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The new guidance is effective for interim and annual reporting periods beginning after December 15, 2019, with early adoption permitted. It is required to be applied on a modified-retrospective approach with certain elements being adopted prospectively. The Company does not expect the adoption of the new guidance will have a material impact on its consolidated financial statements and related disclosures. Lease Accounting In February 2016, the FASB issued new guidance for lease accounting, which will require lessees to recognize leases on the balance sheet and disclose key information about leasing arrangements. The new guidance establishes a right-of-use model (“ROU”) that will require a lessee to recognize a ROU asset and a lease liability on the balance sheet for all leases with a term longer than twelve months. Leases will be classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the income statement. For lessors, the guidance modifies the classification criteria and accounting for sales-type and direct financing leases. The majority of the Company’s leases are for certain of its office and manufacturing space. The Company is a party to one arrangement as the lessor, for its former Westcor facility located in Sunnyvale, California. The new standard is effective for the Company as of January 1, 2019, with early adoption permitted. The Company plans to adopt the new guidance on its effective date. The new standard must be adopted using a modified retrospective transition approach, applying the guidance to all leases existing at the date of initial application. An entity may choose to use either (1) its effective date or (2) the beginning of the earliest comparative period presented in the financial statements as its date of application. The Company plans to adopt the new standard on January 1, 2019 and use the effective date as our date of initial application. As a result, financial information will not be updated and the disclosures required under the new standard will not be provided for dates and periods before January 1, 2019. The new standard provides a number of optional practical expedients. The Company expects to elect the ‘package of practical expedients’, which permits companies to not reassess under the new standard lease identification, lease classification and initial direct costs. The Company does not plan to elect the use-of-hindsight or the practical expedient pertaining to land easements, the latter not being applicable. The Company has developed an implementation plan and continues to gather information, including compiling an inventory of all leasing arrangements and performing initial calculations, to assess the impact of the new standard on its financial statements. While the Company believes this new standard will have a material impact on the financial statements, particularly the balance sheet and disclosures, a quantification of the potential impact has not yet been completed. Other new pronouncements issued but not effective until after September 30, 2018 are not expected to have a material impact on the Company’s consolidated financial statements.

Recently Adopted Accounting Standard (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Standards Update 2014-09 [Member]

Summary of Cumulative Effect of Adoption on Consolidated Statement of Operations

The following tables summarize the impacts of adopting the new revenue recognition guidance on certain components of the Company’s condensed consolidated financial statements (in thousands):

a) Consolidated Balance Sheet Items


	As of September 30, 2018
	As reported		Adjustments			Balances without adoption of Topic 606
Accounts receivable, net	$	45,052	$	(24	)	$	45,028
Inventories, net		43,444		(128	)		43,316
Total assets		207,665		(152	)		207,513

Income taxes payable		708		(25	)		683
Deferred revenue		4,442		4,911			9,353
Sales allowances		567		(497	)		70
Total liabilities		31,705		4,389			36,094

Retained earnings		122,090		(4,541	)		117,549
Total equity		175,960		(4,541	)		171,419
Total liabilities and equity		207,665		(152	)		207,513

b) Consolidated Statement of Operations Items


	Three Months Ended September 30, 2018
	As reported		Adjustments			Balances without adoption of Topic 606
Net revenues	$	78,035	$	(1,026	)	$	77,009
Cost of revenues		39,031		(575	)		38,456

Gross margin		39,004		(451	)		38,553

Income before income taxes		13,275		(451	)		12,824
Provision for income taxes		227		(7	)		220
Consolidated net income		13,048		(444	)		12,604
Net income attributable to Vicor Corporation		13,012		(444	)		12,568

	Nine Months Ended September 30, 2018
	As reported		Adjustments			Balances without adoption of Topic 606
Net revenues	$	217,500	$	(2,427	)	$	215,073
Cost of revenues		112,402		(1,531	)		110,871

Gross margin		105,098		(896	)		104,202

Income before income taxes		25,663		(896	)		24,767
Provision for income taxes		724		(25	)		699
Consolidated net income		24,939		(871	)		24,068
Net income attributable to Vicor Corporation		24,815		(871	)		23,944

Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2018

Summary of Net Revenues Disaggregated by Geography

The following tables present the Company’s net revenues disaggregated by geography based on the location of the customer, by reportable segment, (in thousands):


	Three Months Ended September 30, 2018
	BBU		VI Chip		Picor		Total
United States	$	20,508	$	8,265	$	887	$	29,660
Europe		7,013		1,119		68		8,200
Asia Pacific		22,136		11,252		5,326		38,714
All other		1,369		92		—		1,461

	$	51,026	$	20,728	$	6,281	$	78,035


	Nine Months Ended September 30, 2018
	BBU		VI Chip		Picor		Total
United States	$	55,794	$	24,035	$	1,873	$	81,702
Europe		16,615		2,861		249		19,725
Asia Pacific		64,223		33,544		14,566		112,333
All other		3,380		317		43		3,740

	$	140,012	$	60,757	$	16,731	$	217,500

The following tables present the Company’s net revenues disaggregated by the category of revenue, by reportable segment, (in thousands):


	Three Months Ended September 30, 2018
	BBU		VI Chip		Picor		Total
Direct customers, contract manufacturers and non-stocking distributors	$	44,269	$	17,853	$	5,655	$	67,777
Stocking distributors, net of sales allowances		6,236		1,254		519		8,009
Non-recurring engineering		513		1,604		90		2,207
Royalties		8		8		8		24
Other		—		9		9		18

	$	51,026	$	20,728	$	6,281	$	78,035


	Nine Months Ended September 30, 2018
	BBU		VI Chip		Picor		Total
Direct customers, contract manufacturers and non-stocking distributors	$	123,147	$	52,787	$	15,137	$	191,071
Stocking distributors, net of sales allowances		15,934		5,673		1,251		22,858
Non-recurring engineering		885		2,224		270		3,379
Royalties		46		46		46		138
Other		—		27		27		54

	$	140,012	$	60,757	$	16,731	$	217,500

Accounting Standards Update 2014-09 [Member]

Summary of Changes in Certain Contract Assets and Liabilities

The following table presents the changes in certain contract assets and (liabilities) (in thousands):


	September 30, 2018			December 31, 2017			Increase (decrease)
Accounts receivable	$	45,052		$	34,487		$	10,565
Deferred revenue		(2,735	)		(5,015	)		2,280
Deferred expenses		315			377			(62	)
Customer prepayments		(1,707	)		(776	)		(931	)
Sales allowances		(567	)		—			(567	)

Long-Term Investments (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-Sale Securities

The following is a summary of available-for-sale securities (in thousands):


September 30, 2018	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Failed Auction Security	$	3,000	$	—	$	387	$	2,613


December 31, 2017	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Failed Auction Security	$	3,000	$	—	$	475	$	2,525

Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturities

The cost and estimated fair value of the Failed Auction Security on September 30, 2018, by contractual maturity, is shown below (in thousands):


	Cost		Estimated Fair Value
Due in twenty to forty years	$	3,000	$	2,613

Rollforward of Credit (Gain) Loss Recognized in Earnings on Failed Auction Security

The following table represents a rollforward of the activity related to the credit loss recognized in earnings on the Failed Auction Security for the nine months ended September 30 (in thousands):


	2018			2017
Balance at the beginning of the period	$	48		$	59
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized		(6	)		(9	)

Balance at the end of the period	$	42		$	50

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis included the following as of September 30, 2018 (in thousands):


	Using
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value as of September 30, 2018
Cash equivalents:
Money market funds	$	9,542	$	—	$	—		$	9,542
Long-term investments:
Failed Auction Security		—		—		2,613			2,613
Liabilities:
Contingent consideration obligations		—		—		(470	)		(470	)

Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 2017 (in thousands):


	Using
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value as of December 31, 2017
Cash equivalents:
Money market funds	$	9,279	$	—	$	—		$	9,279
Long-term investments:
Failed Auction Security		—		—		2,525			2,525
Liabilities:
Contingent consideration obligations		—		—		(678	)		(678	)

Quantitative Information about Level 3 Fair Value Measurements

Quantitative information about Level 3 fair value measurements as of September 30, 2018 is as follows (dollars in thousands):


	Fair Value		Valuation Technique		Unobservable Input	Weighted Average
Failed Auction Security	$	2,613		Discounted cash flow	Cumulative probability of earning the maximum rate until maturity		0.06	%
					Cumulative probability of principal return prior to maturity		94.80	%
					Cumulative probability of default		5.15	%
					Liquidity risk premium		5.00	%
					Recovery rate in default		40.00	%

Change in Estimated Fair Values Calculated for Investment Valued on Recurring Basis Utilizing Level 3 Inputs


Balance at the beginning of the period	$	2,525
Credit gain on available-for-sale securities included in Other income (expense), net		6
Gain included in Other comprehensive income		82

Balance at the end of the period	$	2,613

Change in Estimated Fair Value Calculated for Liabilities Valued on Recurring Basis Utilizing Level 3 Inputs


Balance at the beginning of the period	$	678
Payments		(208	)

Balance at the end of the period	$	470

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation Expense

Stock-based compensation expense was as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of revenues	$	58	$	53	$	173	$	125
Selling, general and administrative		474		466		1,973		861
Research and development		156		212		458		286

Total stock-based compensation	$	688	$	731	$	2,604	$	1,272

Summary of Compensation Expense by Type of Award

Compensation expense by type of award was as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Stock options	$	503	$	689	$	2,101	$	1,230
ESPP		185		42		503		42

Total stock-based compensation	$	688	$	731	$	2,604	$	1,272

Net Income (Loss) per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Net Income (Loss) Per Share

The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share amounts):


	Three Months Ended September 30,					Nine Months Ended September 30,
	2018		2017			2018		2017
Numerator:
Net income (loss) attributable to Vicor Corporation	$	13,012	$	(11	)	$	24,815	$	(1,444	)

Denominator:
Denominator for basic net income (loss) per share-weighted average shares (1)		40,120		39,288			39,769		39,177
Effect of dilutive securities:
Employee stock options (2)		1,004		—			876		—

Denominator for diluted net income (loss) per share — adjusted weighted-average shares and assumed conversions		41,124		39,288			40,645		39,177

Basic net income (loss) per share	$	0.32	$	(0.00	)	$	0.62	$	(0.04	)

Diluted net income (loss) per share	$	0.32	$	(0.00	)	$	0.61	$	(0.04	)

(1)	Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.

(2)

Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories were as follows (in thousands):


	September 30, 2018		December 31, 2017
Raw materials	$	34,328	$	27,400
Work-in-process		3,864		3,596
Finished goods		5,252		5,503

Net balance	$	43,444	$	36,499

Product Warranties (Tables)

9 Months Ended

Sep. 30, 2018

Guarantees and Product Warranties [Abstract]

Product Warranty Activity

Product warranty activity was as follows (in thousands):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Balance at the beginning of the period	$	326		$	244		$	290		$	214
Accruals for warranties for products sold in the period		6			126			139			321

Fulfillment of warranty obligations		(17	)		(82	)		(94	)		(179	)
Revisions of estimated obligations		(58	)		—			(78	)		(68	)

Balance at the end of the period	$	257		$	288		$	257		$	288

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Provision for Income Taxes and Effective Income Tax Rates

The provision for income taxes and the effective income tax rates were as follows (dollars in thousands):


	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Provision for income taxes	$	227		$	371		$	724		$	539
Effective income tax rate		1.7	%		90.7	%		2.8	%		65.6	%

Segment Information (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Segment Financial Data

The following table provides segment financial data as of and for the three months ended September 30 (in thousands):


	BBU		VI Chip			Picor		Corporate			Eliminations (1)			Total
2018:
Net revenues	$	51,026	$	21,525		$	8,587	$	—		$	(3,103	)	$	78,035
Income (loss) from operations		10,444		1,304			1,579		(284	)		—			13,043
Total assets		268,520		44,262			13,500		83,865			(202,482	)		207,665
Depreciation and amortization		858		913			200		360			—			2,331

2017:
Net revenues	$	38,529	$	14,745		$	6,360	$	—		$	(2,746	)	$	56,888
Income (loss) from operations		2,007		(2,952	)		1,359		(314	)		—			100
Total assets		227,408		33,021			11,934		64,864			(171,151	)		166,076
Depreciation and amortization		971		712			188		373			—			2,244

The following table provides segment financial data as of and for the nine months ended September 30 (in thousands):


	BBU		VI Chip			Picor		Corporate			Eliminations (1)			Total
2018:
Net revenues	$	140,012	$	63,125		$	25,983	$	—		$	(11,620	)	$	217,500
Income (loss) from operations		16,710		3,669			6,037		(1,371	)		—			25,045
Total assets		268,520		44,262			13,500		83,865			(202,482	)		207,665
Depreciation and amortization		2,652		2,560			587		1,071			—			6,870

2017:
Net revenues	$	115,141	$	42,835		$	19,553	$	—		$	(8,470	)	$	169,059
Income (loss) from operations		5,962		(10,761	)		3,825		(842	)		—			(1,816	)
Total assets		227,408		33,021			11,934		64,864			(171,151	)		166,076
Depreciation and amortization		2,944		2,000			558		1,088			—			6,590

(1)

Recently Adopted Accounting Standard - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adopting guidance, increase in retained earnings	$ 122,090		$ 93,605
Adjustments [Member] \| Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adopting guidance, increase in retained earnings	$ (4,541)	$ 3,670

Recently Adopted Accounting Standard - Summary of Cumulative Effect of Adoption on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017
Item Effected [Line Items]
Accounts receivable, net	$ 45,052
Inventories, net	43,444		$ 36,499
Total assets	207,665		165,724	$ 166,076
Income taxes payable	708		300
Deferred revenue	4,442		5,791
Sales allowances	567
Total liabilities	31,705		29,305
Retained earnings	122,090		93,605
Total equity	175,960		136,419
Total liabilities and equity	207,665		$ 165,724
Accounting Standards Update 2014-09 [Member]
Item Effected [Line Items]
Sales allowances	567
Accounting Standards Update 2014-09 [Member] \| Adjustments [Member]
Item Effected [Line Items]
Accounts receivable, net	(24)
Inventories, net	(128)
Total assets	(152)
Income taxes payable	(25)
Deferred revenue	4,911
Sales allowances	(497)
Total liabilities	4,389
Retained earnings	(4,541)	$ 3,670
Total equity	(4,541)
Total liabilities and equity	(152)
Accounting Standards Update 2014-09 [Member] \| Balances without adoption of Topic 606 [Member]
Item Effected [Line Items]
Accounts receivable, net	45,028
Inventories, net	43,316
Total assets	207,513
Income taxes payable	683
Deferred revenue	9,353
Sales allowances	70
Total liabilities	36,094
Retained earnings	117,549
Total equity	171,419
Total liabilities and equity	$ 207,513

Recently Adopted Accounting Standard - Summary of Cumulative Effect of Adoption on Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Item Effected [Line Items]
Net revenues	$ 78,035	$ 56,888	$ 217,500	$ 169,059
Cost of revenues	39,031	31,745	112,402	94,334
Gross margin	39,004	25,143	105,098	74,725
Income before income taxes	13,275	409	25,663	(822)
Provision for income taxes	227	371	724	539
Consolidated net income	13,048	38	24,939	(1,361)
Net income attributable to Vicor Corporation	13,012	$ (11)	24,815	$ (1,444)
Accounting Standards Update 2014-09 [Member] \| Adjustments [Member]
Item Effected [Line Items]
Net revenues	(1,026)		(2,427)
Cost of revenues	(575)		(1,531)
Gross margin	(451)		(896)
Income before income taxes	(451)		(896)
Provision for income taxes	(7)		(25)
Consolidated net income	(444)		(871)
Net income attributable to Vicor Corporation	(444)		(871)
Accounting Standards Update 2014-09 [Member] \| Balances without adoption of Topic 606 [Member]
Item Effected [Line Items]
Net revenues	77,009		215,073
Cost of revenues	38,456		110,871
Gross margin	38,553		104,202
Income before income taxes	12,824		24,767
Provision for income taxes	220		699
Consolidated net income	12,604		24,068
Net income attributable to Vicor Corporation	$ 12,568		$ 23,944

Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 2,735	$ 2,735		$ 5,015
Customer payment period	0 years	0 years
Increase in revenue		$ (54)	$ (53)
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Deferred revenue	$ (2,280)	(2,280)
Deferred revenue current	471	$ 781
Accounting Standards Update 2014-09 [Member] \| Balances without adoption of Topic 606 [Member]
Disaggregation of Revenue [Line Items]
Deferred revenue				4,659
Gross deferred cost of revenue				$ 2,135
Accounting Standards Update 2014-09 [Member] \| Adjustments [Member]
Disaggregation of Revenue [Line Items]
Increase in revenue	$ 19,264
Minimum [Member]
Disaggregation of Revenue [Line Items]
Recognition period		6 months
Customer payment period		30 days
Maximum [Member]
Disaggregation of Revenue [Line Items]
Recognition period		12 months
Customer payment period		60 days

Revenue Recognition - Summary of Net Revenues Disaggregated by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 78,035	$ 56,888	$ 217,500	$ 169,059
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	29,660		81,702
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,200		19,725
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	38,714		112,333
All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,461		3,740
BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	51,026		140,012
BBU [Member] \| United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	20,508		55,794
BBU [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	7,013		16,615
BBU [Member] \| Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	22,136		64,223
BBU [Member] \| All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,369		3,380
VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	20,728		60,757
VI Chip [Member] \| United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,265		24,035
VI Chip [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,119		2,861
VI Chip [Member] \| Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	11,252		33,544
VI Chip [Member] \| All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	92		317
Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,281		16,731
Picor [Member] \| United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	887		1,873
Picor [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	68		249
Picor [Member] \| Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 5,326		14,566
Picor [Member] \| All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue			$ 43

Revenue Recognition - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 78,035	$ 56,888	$ 217,500	$ 169,059
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	67,777		191,071
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,009		22,858
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,207		3,379
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	24		138
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	18		54
BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	51,026		140,012
BBU [Member] \| Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	44,269		123,147
BBU [Member] \| Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,236		15,934
BBU [Member] \| Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	513		885
BBU [Member] \| Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	8		46
VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	20,728		60,757
VI Chip [Member] \| Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	17,853		52,787
VI Chip [Member] \| Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,254		5,673
VI Chip [Member] \| Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,604		2,224
VI Chip [Member] \| Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	8		46
VI Chip [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	9		27
Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,281		16,731
Picor [Member] \| Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,655		15,137
Picor [Member] \| Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	519		1,251
Picor [Member] \| Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	90		270
Picor [Member] \| Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	8		46
Picor [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 9		$ 27

Revenue Recognition - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 45,052	$ 34,487
Deferred revenue	(2,735)	(5,015)
Deferred expenses	315	377
Customer prepayments	(1,707)	$ (776)
Sales allowances	(567)
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Accounts receivable	10,565
Deferred revenue	2,280
Deferred expenses	(62)
Customer prepayments	(931)
Sales allowances	$ (567)

Long-Term Investments - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Unrealized Losses On Short Term And Long Term Investments [Line Items]
Minimum period for which failed auction securities been in unrealized loss position	12 months
Failed Auction Security [Member]
Unrealized Losses On Short Term And Long Term Investments [Line Items]
Amortized cost of securities	$ 3,000,000	$ 3,000,000
Period for which failed auction securities been in unrealized loss position	Exceeds 12 months
Estimated Fair Value	$ 2,613,000	2,525,000
Gross Unrealized Losses	387,000	475,000
Aggregate credit loss	42,000	$ 48,000	$ 50,000	$ 59,000
Aggregate temporary impairment loss	$ 345,000

Long-Term Investments - Summary of Available-for-Sale Securities (Detail) - Failed Auction Security [Member] - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Cost	$ 3,000,000	$ 3,000,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	387,000	475,000
Estimated Fair Value	$ 2,613,000	$ 2,525,000

Long-Term Investments - Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturity (Detail) $ in Thousands	Sep. 30, 2018 USD ($)
Available-for-sale Securities, Debt Maturities [Abstract]
Due in twenty to forty years, Cost	$ 3,000
Due in twenty to forty years, Estimated Fair Value	$ 2,613

Long-Term Investments - Rollforward of Credit (Gain) Loss Recognized in Earnings on Failed Auction Security (Detail) - Failed Auction Security [Member] - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Balance at the beginning of the period	$ 48,000	$ 59,000
Reductions in the amount related to credit gain for which other-than- temporary impairment was not previously recognized	(6,000)	(9,000)
Balance at the end of the period	$ 42,000	$ 50,000

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Contingent Consideration Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Liabilities, fair value on recurring basis	$ (470)	$ (678)
Failed Auction Security [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	2,613	2,525
Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	9,542	9,279
Recurring [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	9,542	9,279
Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Contingent Consideration Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Liabilities, fair value on recurring basis	(470)	(678)
Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Failed Auction Security [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	$ 2,613	$ 2,525

Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) - Failed Auction Security [Member] - Significant Unobservable Inputs (Level 3) [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	$ 2,613
Valuation Technique	Discounted cash flow
Cumulative Probability of Earning Maximum Rate Until Maturity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Cumulative probability of earning the maximum rate until maturity
Weighted Average Interest Rate	0.06%
Cumulative Probability of Principal Return Prior to Maturity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Cumulative probability of principal return prior to maturity
Weighted Average Interest Rate	94.80%
Cumulative Probability of Default [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Cumulative probability of default
Weighted Average Interest Rate	5.15%
Liquidity Risk Premium [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Liquidity risk premium
Weighted Average Interest Rate	5.00%
Recovery Rate in Default [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Recovery rate in default
Weighted Average Interest Rate	40.00%

Fair Value Measurements - Change in Estimated Fair Values Calculated for Investment Valued on Recurring Basis Utilizing Level 3 Inputs (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Fair Value Disclosures [Abstract]
Balance at the beginning of the period	$ 2,525
Credit gain on available-for-sale securities included in Other income (expense), net	6
Gain included in Other comprehensive income	82
Balance at the end of the period	$ 2,613

Fair Value Measurements - Change in Estimated Fair Value Calculated for Liabilities Valued on Recurring Basis Utilizing Level 3 Inputs (Detail) - Significant Unobservable Inputs (Level 3) [Member] - Contingent Consideration Obligations [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at the beginning of the period	$ 678
Payments	(208)
Balance at the end of the period	$ 470

Fair Value Measurements - Additional Information (Detail)	Sep. 30, 2018 USD ($)
Fair Value Disclosures [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 688	$ 731	$ 2,604	$ 1,272
Cost of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	58	53	173	125
Selling, General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	474	466	1,973	861
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 156	$ 212	$ 458	$ 286

Stock-Based Compensation - Summary of Compensation Expense by Type of Award (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 688	$ 731	$ 2,604	$ 1,272
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	503	689	2,101	1,230
ESPP [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 185	$ 42	$ 503	$ 42

Net Income (Loss) per Share - Computation Of Basic And Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income (loss) attributable to Vicor Corporation	$ 13,012	$ (11)	$ 24,815	$ (1,444)
Denominator:
Denominator for basic net income (loss) per share-weighted average shares	40,120	39,288	39,769	39,177
Effect of dilutive securities:
Employee stock options	1,004		876
Denominator for diluted net income (loss) per share - adjusted weighted-average shares and assumed conversions	41,124	39,288	40,645	39,177
Basic net income (loss) per share	$ 0.32	$ 0.00	$ 0.62	$ (0.04)
Diluted net income (loss) per share	$ 0.32	$ 0.00	$ 0.61	$ (0.04)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Income (Loss) per Share - Computation Of Basic And Diluted Net Income (Loss) Per Share (Parenthetical) (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Options to purchase shares of Common Stock not included in the computation of diluted income (loss) per share	54,818	1,452,808	47,573	1,452,808

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 34,328	$ 27,400
Work-in-process	3,864	3,596
Finished goods	5,252	5,503
Net balance	$ 43,444	$ 36,499

Product Warranties - Additional Information (Detail)		9 Months Ended
Product Warranties - Additional Information (Detail)	Jan. 01, 2017	Sep. 30, 2018
Product Warranty Liability [Line Items]
Product warranty period		2 years
Military Grade Products [Member]
Product Warranty Liability [Line Items]
Extended warranty period	3 years

Product Warranties - Product Warranty Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Guarantees [Abstract]
Balance at the beginning of the period	$ 326	$ 244	$ 290	$ 214
Accruals for warranties for products sold in the period	6	126	139	321
Fulfillment of warranty obligations	(17)	(82)	(94)	(179)
Revisions of estimated obligations	(58)		(78)	(68)
Balance at the end of the period	$ 257	$ 288	$ 257	$ 288

Severance and Other Charges - Additional Information (Detail) $ in Thousands	3 Months Ended
	Jun. 30, 2018 USD ($)
Schedule Of Sale Of Subsidiary [Abstract]
Severance charges	$ 350

Income Taxes - Provision for Income Taxes and Effective Income Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 227	$ 371	$ 724	$ 539
Effective income tax rate	1.70%	90.70%	2.80%	65.60%

Income Taxes - Additional Information (Detail) - USD ($)			9 Months Ended
	Jan. 31, 2018	Dec. 22, 2017	Sep. 30, 2018	May 31, 2017
Income Tax Disclosure [Line Items]
Tax benefit recognized			$ 0
U.S. federal corporate tax rate		35.00%	21.00%
Valuation allowance, deferred tax assets			$ 28,541,000
Income tax liability				$ 0
Internal Revenue Service (IRS) [Member]
Income Tax Disclosure [Line Items]
Open tax year	2015
New York State Department of Taxation [Member]
Income Tax Disclosure [Line Items]
Open tax year	2014 2015 2016

Commitments and Contingencies - Additional Information (Detail)	Sep. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Capital expenditure commitments	$ 9,512,000

Segment Information - Segment Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 78,035	$ 56,888	$ 217,500	$ 169,059
Income (loss) from operations	13,043	100	25,045	(1,816)
Total assets	207,665	166,076	207,665	166,076	$ 165,724
Depreciation and amortization	2,331	2,244	6,870	6,590
BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	51,026		140,012
VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	20,728		60,757
Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	6,281		16,731
Operating Segments [Member] \| BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	51,026	38,529	140,012	115,141
Income (loss) from operations	10,444	2,007	16,710	5,962
Total assets	268,520	227,408	268,520	227,408
Depreciation and amortization	858	971	2,652	2,944
Operating Segments [Member] \| VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	21,525	14,745	63,125	42,835
Income (loss) from operations	1,304	(2,952)	3,669	(10,761)
Total assets	44,262	33,021	44,262	33,021
Depreciation and amortization	913	712	2,560	2,000
Operating Segments [Member] \| Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	8,587	6,360	25,983	19,553
Income (loss) from operations	1,579	1,359	6,037	3,825
Total assets	13,500	11,934	13,500	11,934
Depreciation and amortization	200	188	587	558
Operating Segments [Member] \| Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(284)	(314)	(1,371)	(842)
Total assets	83,865	64,864	83,865	64,864
Depreciation and amortization	360	373	1,071	1,088
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	(3,103)	(2,746)	(11,620)	(8,470)
Total assets	$ (202,482)	$ (171,151)	$ (202,482)	$ (171,151)