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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	Apr. 19, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Registrant Name	VICOR CORP
Entity Central Index Key	0000751978
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	VICR
Entity Emerging Growth Company	false
Entity Small Business	false
Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		28,506,334
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,758,218

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 66,614	$ 70,557
Accounts receivable, less allowance of $131 in 2019 and $224 in 2018	41,705	43,673
Inventories, net	51,589	47,370
Other current assets	3,880	3,460
Total current assets	163,788	165,060
Long-term deferred tax assets, net	266	265
Long-term investments, net	2,546	2,526
Property, plant and equipment, net	55,642	50,432
Other assets	2,762	2,785
Total assets	225,004	221,068
Current liabilities:
Accounts payable	11,177	16,149
Accrued compensation and benefits	9,410	10,657
Accrued expenses	2,166	2,631
Operating lease liabilities	1,678
Sales allowances	617	548
Accrued severance and other charges	49	234
Income taxes payable	182	710
Deferred revenue	5,454	5,069
Total current liabilities	30,733	35,998
Long-term deferred revenue	214	232
Contingent consideration obligations	378	408
Long-term income taxes payable	240	238
Long-term operating lease liabilities	2,747	102
Total liabilities	34,312	36,978
Commitments and contingencies (Note 12)
Vicor Corporation stockholders' equity:
Additional paid-in capital	195,799	193,457
Retained earnings	133,286	129,000
Accumulated other comprehensive loss	(436)	(394)
Treasury stock, at cost	(138,927)	(138,927)
Total Vicor Corporation stockholders' equity	190,243	183,656
Noncontrolling interest	449	434
Total equity	190,692	184,090
Total liabilities and equity	225,004	221,068
Class B Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	118	118
Total equity	118	118
Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	$ 403	$ 402

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts receivable, allowance	$ 131	$ 224

Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Income Statement [Abstract]

Net revenues

$ 65,725

$ 65,269

Cost of revenues

34,639

35,058

Gross margin

31,086

30,211

Operating expenses:

Selling, general and administrative

15,373

15,399

Research and development

11,220

11,126

Total operating expenses

26,593

26,525

Income from operations

4,493

3,686

Other income (expense), net:

Total unrealized gains on available-for-sale securities, net

Less: portion of gains recognized in other comprehensive income

(19)

(21)

Net credit gains recognized in earnings

Other income (expense), net

238

428

Total other income (expense), net

239

430

Income before income taxes

4,732

4,116

Less: Provision for income taxes

426

134

Consolidated net income

4,306

3,982

Less: Net income attributable to noncontrolling interest

Net income attributable to Vicor Corporation

$ 4,286

$ 3,943

Net income per common share attributable to Vicor Corporation:

Basic

$ 0.11

$ 0.10

Diluted

$ 0.10

Shares used to compute net income per common share attributable to Vicor Corporation:

Basic

^[1]

40,229

39,479

Diluted

41,029

40,167

[1]	Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.

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

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Statement of Comprehensive Income [Abstract]

Consolidated net income

$ 4,306

$ 3,982

Foreign currency translation (losses) gains, net of tax

^[1]

(66)

242

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

^[1]

Other comprehensive (loss) income

(47)

263

Consolidated comprehensive income

4,259

4,245

Less: Comprehensive income attributable to noncontrolling interest

Comprehensive income attributable to Vicor Corporation

$ 4,244

$ 4,187

[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 March 31, 2019 and 2018. Therefore, there is no income tax benefit (provision) recognized for the three and three months ended March 31, 2019 and 2018.

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Section 50
-Paragraph 1A
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 6: http://www.xbrl.org/2003/role/exampleRef
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-Name Accounting Standards Codification
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3000-108585

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 55
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686

+ Details

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Consolidated net income	$ 4,306	$ 3,982
Adjustments to reconcile consolidated net income to net cash used for operating activities:
Depreciation and amortization	2,445	2,269
Stock-based compensation expense, net	773	736
(Benefit) provision for doubtful accounts	(88)	32
Increase in long-term income taxes payable	2	5
Increase in other long-term liabilities		2
Decrease in long-term deferred revenue	(18)	(18)
Gain on disposal of equipment	(9)	(14)
Deferred income taxes	(1)	(3)
Credit gain on available-for-sale securities	(1)	(2)
Change in current assets and liabilities, net	(9,529)	(7,801)
Net cash used for operating activities	(2,120)	(812)
Investing activities:
Additions to property, plant and equipment	(3,322)	(1,858)
Proceeds from sale of equipment	9	14
Increase in other assets	(8)	(104)
Net cash used for investing activities	(3,321)	(1,948)
Financing activities:
Proceeds from issuance of Common Stock	1,570	1,285
Payment of contingent consideration obligations	(30)	(94)
Net cash provided by financing activities	1,540	1,191
Effect of foreign exchange rates on cash	(42)	17
Net decrease in cash and cash equivalents	(3,943)	(1,552)
Cash and cash equivalents at beginning of period	70,557	44,230
Cash and cash equivalents at end of period	$ 66,614	$ 42,678

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total Vicor Corporation Stockholders' Equity [Member]	Noncontrolling Interest [Member]	Class B Common Stock [Member]
Beginning Balance at Dec. 31, 2017	$ 136,419	$ 401	$ 181,395	$ 93,605	$ (478)	$ (138,927)	$ 136,114	$ 305	$ 118
Sales of Common Stock	358		358				358
Stock-based compensation expense	736		736				736
Issuances of stock through employee stock purchase plan	927	1	926				927
Cumulative effect of adoption of new accounting principle (Topic 606)	3,670			3,670			3,670
Components of comprehensive income, net of tax
Net income	3,982			3,943			3,943	39
Other comprehensive loss	263				244		244	19
Total comprehensive income (loss)	4,245						4,187	58
Ending Balance at Mar. 31, 2018	146,355	402	183,415	101,218	(234)	(138,927)	145,992	363	118
Beginning Balance at Dec. 31, 2018	184,090	402	193,457	129,000	(394)	(138,927)	183,656	434	118
Sales of Common Stock	291		291				291
Stock-based compensation expense	773		773				773
Issuances of stock through employee stock purchase plan	1,279	1	1,278				1,279
Components of comprehensive income, net of tax
Net income	4,306			4,286			4,286	20
Other comprehensive loss	(47)				(42)		(42)	(5)
Total comprehensive income (loss)	4,259						4,244	15
Ending Balance at Mar. 31, 2019	$ 190,692	$ 403	$ 195,799	$ 133,286	$ (436)	$ (138,927)	$ 190,243	$ 449	$ 118

- Definition

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

+ References

+ Details

Basis of Presentation

3 Months Ended

Mar. 31, 2019

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 months ended March 31, 2019 are not necessarily indicative of the results that may be expected for any other interim period or the year ending December 31, 2019. The balance sheet at December 31, 2018 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, 2018 filed by the Company with the Securities and Exchange Commission on February 28, 2019 (“2018 Form 10-K”).

Recently Adopted Accounting Standard

3 Months Ended

Mar. 31, 2019

Text Block [Abstract]

Recently Adopted Accounting Standard

2.	Recently Adopted Accounting Standard

In February 2016, the FASB issued new guidance for lease accounting, which requires 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 requires 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 are 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 Company adopted the new standard as of January 1, 2019, using the effective date as the date of initial application. As a result, financial information has not been updated and the disclosures required under the new standard have not been provided for dates and periods before January 1, 2019. The Company elected 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 did not elect the use-of-hindsight or the practical expedient pertaining to land easements, the latter not being applicable.

The adoption of the standard resulted in the recognition of ROU assets and lease liabilities of approximately $4,329,000

and $4,455,000, respectively, as of January 1, 2019. There was no cumulative effect of adopting this new guidance, and the standard did not have a material impact on the Company’s consolidated statements of operations or cash flows for the three months ended March 31, 2019.

Inventories

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Inventories

3.	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):

	March 31, 2019		December 31, 2018
Raw materials	$	37,205	$	37,696
Work-in-process		6,386		4,740
Finished goods		7,998		4,934
Net balance	$	51,589	$	47,370

Long-Term Investments

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Long-Term Investments

4.	Long-Term Investments

As of March 31, 2019 and December 31, 2018, 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 March 31, 2019, 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 March 31, 2019.

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

March 31, 2019		Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
Failed Auction Security		$	3,000			$	—			$	454			$	2,546

December 31, 2018		Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
Failed Auction Security		$	3,000			$	—			$	474			$	2,526

As of March 31, 2019, 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 March 31, 2019, by contractual maturity, are shown below (in thousands):

		Cost				Estimated Fair Value
Due in twenty to forty years		$	3,000			$	2,546

Based on the fair value measurements described in Note 5, the fair value of the Failed Auction Security on March 31, 2019, with a par value of $3,000,000, was estimated by the Company to be approximately $2,546,000. The gross unrealized loss of $454,000 on the Failed Auction Security consists of two types of estimated loss: an aggregate credit loss of $40,000 and an aggregate temporary impairment of $414,000. 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 three months ended March 31 (in thousands):

	2019			2018
Balance at the beginning of the period	$	41		$	48
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized		(1	)		(2	)
Balance at the end of the period	$	40		$	46

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

3 Months Ended

Mar. 31, 2019

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 March 31, 2019 (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 March 31, 2019
Cash equivalents:
Money market funds	$	9,484	$	—	$	—		$	9,484
Long-term investments:
Failed Auction Security		—		—		2,546			2,546
Liabilities:
Contingent consideration obligations		—		—		(378	)		(378	)

Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 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 December 31, 2018
Cash equivalents:
Money market funds	$	9,433	$	—	$	—		$	9,433
Long-term investments:
Failed Auction Security		—		—		2,526			2,526
Liabilities:
Contingent consideration obligations		—		—		(408	)		(408	)

As of March 31, 2019, 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 March 31, 2019. 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 2018 Form 10-K.

Quantitative information about Level 3 fair value measurements as of March 31, 2019 is as follows (dollars in thousands):

	Fair Value		Valuation Technique	Unobservable Input	Weighted Average
Failed Auction Security	$	2,546	Discounted cash flow	Cumulative probability of earning the maximum rate until maturity		0.08	%
				Cumulative probability of principal return prior to maturity		94.01	%
				Cumulative probability of default		5.91	%
				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 three months ended March 31, 2019 was as follows (in thousands):

Balance at the beginning of the period	$	2,526
Credit gain on available-for-sale securities included in Other income (expense), net		1
Gain included in Other comprehensive income		19
Balance at the end of the period	$	2,546

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 three months ended March 31, 2019 was as follows (in thousands):

Balance at the beginning of the period	$	408
Payments		(30	)
Balance at the end of the period	$	378

There were no transfers between Level 1 and Level 2 of the fair value hierarchy during the three months ended March 31, 2019.

- 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

Product Warranties

3 Months Ended

Mar. 31, 2019

Guarantees and Product Warranties [Abstract]

Product Warranties

6.	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 March 31,
	2019			2018
Balance at the beginning of the period	$	268		$	290
Accruals for warranties for products sold in the period		29			123
Fulfillment of warranty obligations		(66	)		(57	)
Revisions of estimated obligations		—			(10	)
Balance at the end of the period	$	231		$	346

Revenue

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Revenue

Revenues

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 March 31, 2019
	BBU		VI Chip		Picor		Total
United States	$	22,292	$	6,237	$	712	$	29,241
Europe		6,009		923		63		6,995
Asia Pacific		17,111		9,158		1,742		28,011
All other		1,213		248		17		1,478
	$	46,625	$	16,566	$	2,534	$	65,725

	Three Months Ended March 31, 2018
	BBU		VI Chip		Picor		Total
United States	$	16,991	$	7,999	$	633	$	25,623
Europe		4,725		573		75		5,373
Asia Pacific		18,211		11,387		3,758		33,356
All other		710		180		27		917
	$	40,637	$	20,139	$	4,493	$	65,269

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

	Three Months Ended March 31, 2019
	BBU		VI Chip		Picor		Total
Direct customers, contract manufacturers and non-stocking distributors	$	39,948	$	12,803	$	1,963	$	54,714
Stocking distributors, net of sales allowances		6,117		2,617		549		9,283
Non-recurring engineering		548		1,125		—		1,673
Royalties		12		12		12		36
Other		—		9		10		19
	$	46,625	$	16,566	$	2,534	$	65,725

	Three Months Ended March 31, 2018
	BBU		VI Chip		Picor		Total
Direct customers, contract manufacturers and non-stocking distributors	$	35,474	$	17,306	$	3,980	$	56,760
Stocking distributors, net of sales allowances		4,963		2,554		389		7,906
Non-recurring engineering		175		245		90		510
Royalties		25		25		25		75
Other		—		9		9		18
	$	40,637	$	20,139	$	4,493	$	65,269

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

	March 31, 2019			December 31, 2018			Decrease
Accounts receivable	$	41,705		$	43,673		$	(1,968	)
Deferred revenue		(3,909	)		(3,820	)		(89	)
Deferred expenses		—			501			(501	)
Customer prepayments		(1,545	)		(1,250	)		(295	)
Sales allowances		(617	)		(548	)		(69	)

The decrease in accounts receivable was primarily due to a decrease in net revenues in the first quarter of 2019 compared to the fourth quarter of 2018.

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

Stock-Based Compensation

3 Months Ended

Mar. 31, 2019

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

Stock-Based Compensation

8.	Stock-Based Compensation

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards, whether they possess time-based vesting provisions or performance-based vesting provisions, 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 March 31,
	2019		2018
Cost of revenues	$	69	$	56
Selling, general and administrative		519		542
Research and development		185		138

Total stock-based compensation	$	773	$	736

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


	Three Months Ended March 31,
	2019		2018
Stock options	$	533	$	593
ESPP		240		143

Total stock-based compensation	$	773	$	736

Leases

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Leases

All of the Company’s leases are classified as operating leases. The majority of the Company’s leases are for office and manufacturing space, along with several automobiles and certain equipment. Leases with initial terms of less than twelve months are not recorded on the balance sheet. Expense for these leases is recognized on a straight-line basis over the lease term. The Company’s leases have remaining terms of less than one year to just over six years. The majority of the Company’s leases do not have options to renew, although several have renewal terms to extend the lease for one five-year term, and one lease contains two five-year renewal options. None of the renewal options are included in determining the term of the lease, used for calculating the associated lease liabilities. None of the Company’s leases include variable payments, residual value guarantees or restrictive covenants. A number of the Company’s leases for office and manufacturing space include provision for common area maintenance (“CAM”). The Company accounts for CAM separately from lease payments, and therefore costs for CAM are not included in the determination of lease liabilities. The Company is a party to one arrangement as the lessor, for its former Westcor facility located in Sunnyvale, California, with a third party. The lessee under this lease has one option to renew the lease for a term of five years.

As of March 31, 2019, the balance of ROU assets was approximately

$4,306,000, and the balances of current and long-term lease liabilities were approximately $1,678,000 and $2,747,000, respectively. For the three months ended March 31, 2019, the Company recorded operating lease cost, including short-term lease cost, of approximately $457,000. The ROU assets are included in “Property, plant and equipment, net” in the accompanying Condensed Consolidated Balance Sheets.

The maturities of the Company’s lease liabilities are as follows (in thousands):

2019	$	1,370
2020		1,448
2021		744
2022		439
2023		349
Thereafter		411
Total lease payments	$	4,761
Less: Imputed interest		336
Present value of lease liabilities	$	4,425

As of March 31, 2019, the weighted-average remaining lease term was 3.6 years and the weighted-average discount rate was 3.82% for the

Company’s

operating leases. The Company developed the discount rates used based on a London Interbank Offered Rate (“LIBOR”) over a term approximating the term of the related lease, plus an additional interest factor, which was generally 1.375%.

For the three months ended March 31, 2019, the Company paid approximately $21,000 for amounts included in the measurement of lease liabilities through operating cash flows, and obtained approximately $406,000 in ROU assets in exchange for new operating lease liabilities.

The maturities of the lease payments to be received by the Company under its leased facility in California are as follows (in thousands):

2019	$	639
2020		874
2021		901
2022		928
2023		955
Thereafter		402
Total lease payments to be received	$	4,699

For the three months ended March 31, 2019, the Company recorded lease income under this lease of approximately $214,000.

Income Taxes

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

10.	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.

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


	Three Months Ended March 31,
	2019			2018
Provision for income taxes	$	426		$	134
Effective income tax rate		9.0	%		3.3	%

The effective tax rates were lower than the statutory tax rates for the first quarter of 2019 and the first quarter of 2018 due primarily to the utilization of net operating loss carryforwards and tax credits. The provisions for income taxes in the first quarter of 2019 and the first quarter of 2018 also included estimated foreign income taxes and estimated state taxes in jurisdictions in which the Company does not have net operating loss carryforwards.

As of March 31, 2019, the Company has a valuation allowance of approximately $30,031,000 against all domestic net deferred tax assets, for which realization cannot be considered more likely than not at this time. 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. While recent positive operating results caused the Company to be in a cumulative income position as of March 31, 2019, it has been in such a position for only a limited number of quarters. In addition, some uncertainty in economic conditions that could potentially impact the Company has led management to conclude a full valuation allowance against all domestic net deferred tax assets is still warranted as of March 31, 2019. The valuation allowance against these deferred tax assets may require adjustment in the future based on changes in the mix of temporary differences, changes in tax laws, and operating performance. If the positive quarterly earnings continue, the Company may release all or a portion of the valuation in the near-term. 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.

Net Income per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Net Income per Share

11.	Net Income per Share

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

	Three Months Ended March 31,
	2019		2018
Numerator:
Net income attributable to Vicor Corporation	$	4,286	$	3,943
Denominator:
Denominator for basic net income per share-weighted average shares (1)		40,229		39,479
Effect of dilutive securities:
Employee stock options (2)		800		688
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions		41,029		40,167
Basic net income per share	$	0.11	$	0.10
Diluted net income per share	$	0.10	$	0.10

(1)

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

(2)

Options to purchase

134,535

and

82,241

shares of Common Stock for the three months ended March 31, 2019 and 2018, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

12.	Commitments and Contingencies

At March 31, 2019, the Company had approximately $4,393,000 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. On November 2, 2018, SynQor filed a motion to lift the stay of the Texas Action. On January 3, 2019, the magistrate judge issued an order denying the motion and reaffirming the Court’s original decision that the stay should remain at least until the conclusion of all pending inter partes reexaminations and related appeals. On January 17, 2019, SynQor filed objections to the magistrate judge’s order, and sought reconsideration of that order by the district court judge. The district court judge has not yet ruled on SynQor’s objections.

In 2011, in response to the filing of 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, 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 affirming the examiner’s original rejection of all but one of the remaining claims of the ‘190 patent, and identifying a new basis for rejecting the remaining claim (“claim 34”), which had been added by SynQor during the reexamination. SynQor then requested further examination of claim 34 by the examiner, pursuant to 37 C.F.R. § 41.77(b)(1). On June 22, 2017, the examiner issued a determination under 37 C.F.R. § 41.77(d), finding claim 34 was unpatentable. That decision was affirmed by the PTAB on February 20, 2019. SynQor subsequently appealed that decision to the Federal Circuit and that appeal is currently pending.

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 those decisions. 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. On February 20, 2019, the PTAB issued a decision affirming the examiner’s rejections of all challenged claims. 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 February 20, 2019, the PTAB issued a decision reversing its prior affirmance of the examiner’s non-adoption of rejections with respect to the ‘290 patent, and entering rejections of all of the claims of the ‘290 patent. SynQor may now choose to reopen prosecution of this proceeding, or to appeal the PTAB’s decision to the Federal Circuit.

On October 31, 2017, the Company filed a request with the USPTO for ex parte reexamination of the asserted claims 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 initiating ex parte reexamination of the ‘702 patent after finding that the Company’s request had raised a substantial new question of patentability of the challenged claims. On March 21, 2018, the examiner 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 requesting 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 examiner issued a final office action finding all of the challenged claims of the ‘702 patent to be unpatentable. On October 26, 2018, SynQor filed a notice of appeal appealing the examiner’s final rejection to the PTAB. On December 3, 2018, the USPTO denied SynQor’s petition to vacate the decision initiating the ex parte reexamination. On January 25, 2019, SynQor appealed the Examiner’s final rejection to the PTAB. That appeal is pending. 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 asserted claims 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. On December 3, 2018, the USPTO denied SynQor’s petition to reject the Company’s ex parte reexamination request. On December 4, 2018, the USPTO instituted ex parte reexamination of the ‘190 patent after finding that the Company’s request had raised a substantial new question affecting the patentability of the challenged claims. On March 15, 2019, the USPTO issued a non-final rejection of all of the asserted claims of the ‘190 patent.

On January 23, 2018, the 20-year terms of the ‘190 patent, the ‘021 patent and the ‘702 patent expired. The 20-year term of the ‘290 patent expired on July 16, 2018. As a consequence of these expirations, the Company cannot be liable under any of the SynQor patents for allegedly infringing activities occurring after the patents’ respective expiration dates. In addition, any amended claims that may issue as a result of any of the still-pending reexamination proceedings will have no effective term and cannot be the basis for any liability by the Company.

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, it 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.

Segment Information

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Segment Information

13.	Segment Information

In 2018, Picor Corporation, a consolidated subsidiary of the Company, was merged with and into the Company, and its operations and personnel were reassigned. Although the legal structure of Picor Corporation has ceased to exist, the Company continues to report its operating segments as the Brick Business Unit, VI Chip, and Picor, reflecting its historical organizational segmentation and management’s operational oversight.

The BBU segment designs, develops, manufactures, and markets the Company’s modular 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 through VJCL. The Picor segment, which consists of the operations of the former subsidiary, 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., identified as the “chief operating decision maker”) (“CODM”), pursuant to U.S. GAAP, 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 operating 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 significant segment financial data as of and for the three months ended March 31 (in thousands):

	BBU		VI Chip		Picor			Corporate			Eliminations (1)			Total
2019 :
Net revenues	$	47,673	$	18,429	$	3,272		$	—		$	(3,649	)	$	65,725
Income (loss) from operations		6,055		100		(1,310	)		(352	)		—			4,493
Total assets		287,891		50,975		15,614			84,259			(213,735	)		225,004
Depreciation and amortization		885		1,011		193			356			—			2,445
Capital Expenditures		1,175		1,809		338			—			—			3,322

2018 :
Net revenues	$	40,637	$	20,881	$	8,221		$	—		$	(4,470	)	$	65,269
Income (loss) from operations		1,039		1,081		2,022			(456	)		—			3,686
Total assets		239,619		40,206		12,662			58,095			(176,952	)		173,630
Depreciation and amortization		912		811		191			355			—			2,269
Capital Expenditures		399		1,290		169			—			—			1,858

(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.

Substantially all long-lived assets are located in the United States.

Impact of Recently Issued Accounting Standards

3 Months Ended

Mar. 31, 2019

Accounting Changes and Error Corrections [Abstract]

Impact of Recently Issued Accounting Standards

14.	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

, including the consideration of costs and benefits

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 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.

Other new pronouncements issued but not effective until after March 31, 2019 are not expected to have a material impact on the Company’s consolidated financial statements.

Recently Adopted Accounting Standard (Policies)

3 Months Ended

Mar. 31, 2019

Accounting Changes and Error Corrections [Abstract]

Recently Adopted Accounting Standard

2.	Recently Adopted Accounting Standard

The adoption of the standard resulted in the recognition of ROU assets and lease liabilities of approximately $4,329,000

Impact of recently issued accounting standards

14.	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

, including the consideration of costs and benefits

Other new pronouncements issued but not effective until after March 31, 2019 are not expected to have a material impact on the Company’s consolidated financial statements.

Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories were as follows (in thousands):

	March 31, 2019		December 31, 2018
Raw materials	$	37,205	$	37,696
Work-in-process		6,386		4,740
Finished goods		7,998		4,934
Net balance	$	51,589	$	47,370

Long-Term Investments (Tables)

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-Sale Securities

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

March 31, 2019		Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
Failed Auction Security		$	3,000			$	—			$	454			$	2,546

December 31, 2018		Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
Failed Auction Security		$	3,000			$	—			$	474			$	2,526

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

The cost and estimated fair value of the Failed Auction Security on March 31, 2019, by contractual maturity, are shown below (in thousands):

		Cost				Estimated Fair Value
Due in twenty to forty years		$	3,000			$	2,546

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 three months ended March 31 (in thousands):

	2019			2018
Balance at the beginning of the period	$	41		$	48
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized		(1	)		(2	)
Balance at the end of the period	$	40		$	46

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31, 2019 (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 March 31, 2019
Cash equivalents:
Money market funds	$	9,484	$	—	$	—		$	9,484
Long-term investments:
Failed Auction Security		—		—		2,546			2,546
Liabilities:
Contingent consideration obligations		—		—		(378	)		(378	)

Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 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 December 31, 2018
Cash equivalents:
Money market funds	$	9,433	$	—	$	—		$	9,433
Long-term investments:
Failed Auction Security		—		—		2,526			2,526
Liabilities:
Contingent consideration obligations		—		—		(408	)		(408	)

Quantitative Information about Level 3 Fair Value Measurements

Quantitative information about Level 3 fair value measurements as of March 31, 2019 is as follows (dollars in thousands):

	Fair Value		Valuation Technique	Unobservable Input	Weighted Average
Failed Auction Security	$	2,546	Discounted cash flow	Cumulative probability of earning the maximum rate until maturity		0.08	%
				Cumulative probability of principal return prior to maturity		94.01	%
				Cumulative probability of default		5.91	%
				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	$	2,526
Credit gain on available-for-sale securities included in Other income (expense), net		1
Gain included in Other comprehensive income		19
Balance at the end of the period	$	2,546

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

Balance at the beginning of the period	$	408
Payments		(30	)
Balance at the end of the period	$	378

Product Warranties (Tables)

3 Months Ended

Mar. 31, 2019

Guarantees and Product Warranties [Abstract]

Product Warranty Activity

	Three Months Ended March 31,
	2019			2018
Balance at the beginning of the period	$	268		$	290
Accruals for warranties for products sold in the period		29			123
Fulfillment of warranty obligations		(66	)		(57	)
Revisions of estimated obligations		—			(10	)
Balance at the end of the period	$	231		$	346

Revenue (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31, 2019
	BBU		VI Chip		Picor		Total
United States	$	22,292	$	6,237	$	712	$	29,241
Europe		6,009		923		63		6,995
Asia Pacific		17,111		9,158		1,742		28,011
All other		1,213		248		17		1,478
	$	46,625	$	16,566	$	2,534	$	65,725

	Three Months Ended March 31, 2018
	BBU		VI Chip		Picor		Total
United States	$	16,991	$	7,999	$	633	$	25,623
Europe		4,725		573		75		5,373
Asia Pacific		18,211		11,387		3,758		33,356
All other		710		180		27		917
	$	40,637	$	20,139	$	4,493	$	65,269

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

	Three Months Ended March 31, 2019
	BBU		VI Chip		Picor		Total
Direct customers, contract manufacturers and non-stocking distributors	$	39,948	$	12,803	$	1,963	$	54,714
Stocking distributors, net of sales allowances		6,117		2,617		549		9,283
Non-recurring engineering		548		1,125		—		1,673
Royalties		12		12		12		36
Other		—		9		10		19
	$	46,625	$	16,566	$	2,534	$	65,725

	Three Months Ended March 31, 2018
	BBU		VI Chip		Picor		Total
Direct customers, contract manufacturers and non-stocking distributors	$	35,474	$	17,306	$	3,980	$	56,760
Stocking distributors, net of sales allowances		4,963		2,554		389		7,906
Non-recurring engineering		175		245		90		510
Royalties		25		25		25		75
Other		—		9		9		18
	$	40,637	$	20,139	$	4,493	$	65,269

Accounting Standards Update 2014-09 [Member]

Summary of Net Revenues Disaggregated by Geography

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

	March 31, 2019			December 31, 2018			Decrease
Accounts receivable	$	41,705		$	43,673		$	(1,968	)
Deferred revenue		(3,909	)		(3,820	)		(89	)
Deferred expenses		—			501			(501	)
Customer prepayments		(1,545	)		(1,250	)		(295	)
Sales allowances		(617	)		(548	)		(69	)

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Stock-Based Compensation Expense

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


	Three Months Ended March 31,
	2019		2018
Cost of revenues	$	69	$	56
Selling, general and administrative		519		542
Research and development		185		138

Total stock-based compensation	$	773	$	736

Summary of Compensation Expense by Type of Award

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


	Three Months Ended March 31,
	2019		2018
Stock options	$	533	$	593
ESPP		240		143

Total stock-based compensation	$	773	$	736

Lease (Table)

3 Months Ended

Mar. 31, 2019

Leases, Operating [Abstract]

Maturities of Lease Liabilities

The maturities of the Company’s lease liabilities are as follows (in thousands):

2019	$	1,370
2020		1,448
2021		744
2022		439
2023		349
Thereafter		411
Total lease payments	$	4,761
Less: Imputed interest		336
Present value of lease liabilities	$	4,425

Maturities of Lease Payments

The maturities of the lease payments to be received by the Company under its leased facility in California are as follows (in thousands):

2019	$	639
2020		874
2021		901
2022		928
2023		955
Thereafter		402
Total lease payments to be received	$	4,699

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019			2018
Provision for income taxes	$	426		$	134
Effective income tax rate		9.0	%		3.3	%

Net Income per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Net Income Per Share

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

	Three Months Ended March 31,
	2019		2018
Numerator:
Net income attributable to Vicor Corporation	$	4,286	$	3,943
Denominator:
Denominator for basic net income per share-weighted average shares (1)		40,229		39,479
Effect of dilutive securities:
Employee stock options (2)		800		688
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions		41,029		40,167
Basic net income per share	$	0.11	$	0.10
Diluted net income per share	$	0.10	$	0.10

(1)

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

(2)

Options to purchase

134,535

and

82,241

shares of Common Stock for the three months ended March 31, 2019 and 2018, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.

Segment Information (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Segment Financial Data

The following table provides significant segment financial data as of and for the three months ended March 31 (in thousands):

	BBU		VI Chip		Picor			Corporate			Eliminations (1)			Total
2019 :
Net revenues	$	47,673	$	18,429	$	3,272		$	—		$	(3,649	)	$	65,725
Income (loss) from operations		6,055		100		(1,310	)		(352	)		—			4,493
Total assets		287,891		50,975		15,614			84,259			(213,735	)		225,004
Depreciation and amortization		885		1,011		193			356			—			2,445
Capital Expenditures		1,175		1,809		338			—			—			3,322

2018 :
Net revenues	$	40,637	$	20,881	$	8,221		$	—		$	(4,470	)	$	65,269
Income (loss) from operations		1,039		1,081		2,022			(456	)		—			3,686
Total assets		239,619		40,206		12,662			58,095			(176,952	)		173,630
Depreciation and amortization		912		811		191			355			—			2,269
Capital Expenditures		399		1,290		169			—			—			1,858

(1)

Recently Adopted Accounting Standard - Additional Information (Detail) - USD ($)	Mar. 31, 2019	Jan. 01, 2019
Operating leases right of use assets	$ 4,306,000	$ 4,329,000
Operating Lease, Liability	$ 4,425,000	$ 4,455,000

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 37,205	$ 37,696
Work-in-process	6,386	4,740
Finished goods	7,998	4,934
Net balance	$ 51,589	$ 47,370

Long-Term Investments - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
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	$ 2,546,000	2,526,000
Gross Unrealized Losses	454,000	474,000
Aggregate credit loss	40,000	$ 41,000	$ 46,000	$ 48,000
Aggregate temporary impairment loss	$ 414,000

Long-Term Investments - Summary of Available-for-Sale Securities (Detail) - Failed Auction Security [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Cost	$ 3,000	$ 3,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	454	474
Estimated Fair Value	$ 2,546	$ 2,526

Long-Term Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturities (Detail) $ in Thousands	Mar. 31, 2019 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	$ 2,546

Long-Term Investments - Rollforward of Credit (Gain) Loss Recognized in Earnings on Available-for-Sale Auction Rate Securities (Detail) - Failed Auction Security [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Balance at the beginning of the period	$ 41	$ 48
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized	(1)	(2)
Balance at the end of the period	$ 40	$ 46

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Contingent Consideration Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Liabilities, fair value on recurring basis	$ (378)	$ (408)
Failed Auction Security [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	2,546	2,526
Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	9,484	9,433
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	9,484	9,433
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	(378)	(408)
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	$ 2,546	$ 2,526

Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) - Failed Auction Security [Member] - Significant Unobservable Inputs (Level 3) [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	$ 2,546
Cumulative Probability of Earning Maximum Rate Until Maturity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Discounted cash flow
Unobservable Input	Cumulative probability of earning the maximum rate until maturity
Weighted Average Interest Rate	0.08%
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	94.01%
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	5.91%
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	3 Months Ended
	Mar. 31, 2019 USD ($)
Fair Value Disclosures [Abstract]
Balance at the beginning of the period	$ 2,526
Credit gain on available-for-sale security included in Other income (expense), net	1
Gain included in Other comprehensive income (loss)	19
Balance at the end of the period	$ 2,546

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	3 Months Ended
	Mar. 31, 2019 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at the beginning of the period	$ 408
Payments	(30)
Balance at the end of the period	$ 378

Fair Value Measurements - Additional Information (Detail)	Mar. 31, 2019 USD ($)
Fair Value Disclosures [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0

Product Warranties - Product Warranty Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Guarantees [Abstract]
Balance at the beginning of the period	$ 268	$ 290
Accruals for warranties for products sold in the period	29	123
Fulfillment of warranty obligations	(66)	(57)
Revisions of estimated obligations	0	(10)
Balance at the end of the period	$ 231	$ 346

Revenue - Summary of Net Revenues Disaggregated by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 65,725	$ 65,269
BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,625	40,637
VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	16,566	20,139
Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,534	4,493
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	29,241	25,623
United States [Member] \| BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	22,292	16,991
United States [Member] \| VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,237	7,999
United States [Member] \| Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	712	633
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,995	5,373
Europe [Member] \| BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,009	4,725
Europe [Member] \| VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	923	573
Europe [Member] \| Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	63	75
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	28,011	33,356
Asia Pacific [Member] \| BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	17,111	18,211
Asia Pacific [Member] \| VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,158	11,387
Asia Pacific [Member] \| Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,742	3,758
All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,478	917
All Other [Member] \| BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,213	710
All Other [Member] \| VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	248	180
All Other [Member] \| Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 17	$ 27

Revenue - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 65,725	$ 65,269
BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	46,625	40,637
VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	16,566	20,139
Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,534	4,493
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	54,714	56,760
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] \| BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	39,948	35,474
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] \| VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	12,803	17,306
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] \| Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,963	3,980
Stocking Distributors, Net of Sales Allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,283	7,906
Stocking Distributors, Net of Sales Allowances [Member] \| BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,117	4,963
Stocking Distributors, Net of Sales Allowances [Member] \| VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,617	2,554
Stocking Distributors, Net of Sales Allowances [Member] \| Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	549	389
Non-recurring Engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,673	510
Non-recurring Engineering [Member] \| BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	548	175
Non-recurring Engineering [Member] \| VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,125	245
Non-recurring Engineering [Member] \| Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	90
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	36	75
Royalties [Member] \| BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	12	25
Royalties [Member] \| VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	12	25
Royalties [Member] \| Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	12	25
Other
Disaggregation of Revenue [Line Items]
Revenue	19	18
Other \| BBU [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Other \| VI Chip [Member]
Disaggregation of Revenue [Line Items]
Revenue	9	9
Other \| Picor [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 10	$ 9

Revenue - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 41,705	$ 43,673
Deferred revenue	(3,909)	(3,820)
Deferred expenses	0	501
Customer prepayments	(1,545)	(1,250)
Sales allowances	(617)	$ (548)
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Accounts receivable	(1,968)
Deferred revenue	(89)
Deferred expenses	(501)
Customer prepayments	(295)
Sales allowances	$ (69)

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 773	$ 736
Cost of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	69	56
Selling, General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	519	542
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 185	$ 138

Stock-Based Compensation - Summary of Compensation Expense by Type of Award (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 773	$ 736
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	533	593
ESPP [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 240	$ 143

Leases - Additional information (Detail) - USD ($)	3 Months Ended
Leases - Additional information (Detail) - USD ($)	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating leases right of use assets	$ 4,306,000	$ 4,329,000
Long-term lease liabilities current portion	1,678,000
Long-term lease liabilities non current portion	2,747,000		$ 102,000
Short-term lease cost	$ 457,000
Weighted-average remaining lease term	3 years 7 months 6 days
Weighted-average discount rate	3.82%
Additional interest factor	1.375%
Lease liabilities paid	$ 21,000
ROU assets in exchange for new operating lease liabilities	406,000
Lease income	$ 214,000

Leases - Maturities of Lease Liabilities (Detail) - USD ($)	Mar. 31, 2019	Jan. 01, 2019
2019	$ 1,370,000
2020	1,448,000
2021	744,000
2022	439,000
2023	349,000
Thereafter	411,000
Total lease payments	4,761,000
Less: Imputed interest	336,000
Present value of lease liabilities	$ 4,425,000	$ 4,455,000

Leases - Maturities of Lease Payments (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
2019	$ 639
2020	874
2021	901
2022	928
2023	955
Thereafter	402
Total lease payments to be received	$ 4,699

Income Taxes - Additional Information (Detail)	Mar. 31, 2019 USD ($)
Income Tax Disclosure [Line Items]
Valuation allowance, deferred tax assets	$ 30,031,000

Income Taxes - Provision for Income Taxes and Effective Income Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 426	$ 134
Effective income tax rate	9.00%	3.30%

Net Income per Share - Computation Of Basic And Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Numerator:

Net income attributable to Vicor Corporation

$ 4,286

$ 3,943

Denominator:

Denominator for basic net income per share-weighted average shares

^[1]

40,229

39,479

Effect of dilutive securities:

Employee stock options

^[2]

800

688

Denominator for diluted net income per share - adjusted weighted-average shares and assumed conversions

41,029

40,167

Basic net income per share

$ 0.11

$ 0.10

Diluted net income per share

$ 0.10

[1]	Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
[2]	Options to purchase 134,535 and 82,241 shares of Common Stock for the three months ended March 31, 2019 and 2018, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.

- Definition

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

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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.

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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 per Share - Computation Of Basic And Diluted Net Income Per Share (Parenthetical) (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Options to purchase shares of Common Stock not included in the computation of diluted income per share	134,535	82,241