Vicor (VICR) 10-Q 3 Nov 23 2023 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Oct. 24, 2023
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Registrant Name	VICOR CORPORATION
Entity Central Index Key	0000751978
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	VICR
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Document Transition Report	false
Document Quarterly Report	true
Securities Act File Number	0-18277
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-2742817
Entity Address, Address Line One	25 Frontage Road
Entity Address, City or Town	Andover
Entity Address, Postal Zip Code	01810
City Area Code	978
Local Phone Number	470-2900
Security Exchange Name	NASDAQ
Entity Address, State or Province	MA
Title of 12(b) Security	Common Stock
Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		32,707,062
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,743,218

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 227,784	$ 190,611
Accounts receivable, net	62,638	65,429
Inventories	104,570	101,410
Other current assets	3,975	5,154
Total current assets	398,967	362,604
Long-term deferred tax assets, net	341	280
Long-term investment, net	2,611	2,622
Property, plant and equipment, net	170,596	166,009
Other assets	11,620	5,386
Total assets	584,135	536,901
Current liabilities:
Accounts payable	14,146	22,207
Accrued compensation and benefits	11,534	10,849
Accrued litigation	6,500	6,500
Accrued expenses	5,438	8,613
Short-term lease liabilities	1,698	1,450
Sales allowances	2,553	1,661
Income taxes payable	1,046	72
Short-term deferred revenue and customer prepayments	3,618	13,197
Total current liabilities	46,533	64,549
Long-term deferred revenue	1,380	145
Long-term income taxes payable	848	862
Long-term lease liabilities	6,590	7,009
Total liabilities	55,351	72,565
Commitments and contingencies (Note 10)
Vicor Corporation stockholders' equity:
Additional paid-in capital	380,151	360,365
Retained earnings	288,006	243,079
Accumulated other comprehensive loss	(1,245)	(988)
Treasury stock at cost: 11,634,806 shares in 2023 and 2022	(138,927)	(138,927)
Total Vicor Corporation stockholders' equity	528,548	464,088
Noncontrolling interest	236	248
Total equity	528,784	464,336
Total liabilities and equity	584,135	536,901
Class B Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	118	118
Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	$ 445	$ 441

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical)	Sep. 30, 2023 Vote $ / shares shares	Dec. 31, 2022 Vote $ / shares shares
Treasury stock, shares	11,634,806	11,634,806
Class B Common Stock [Member]
Common Stock, votes per share | Vote	10	10
Common Stock, par value | $ / shares	$ 0.01	$ 0.01
Common Stock, shares authorized	14,000,000	14,000,000
Common Stock, shares issued	11,743,218	11,743,218
Common Stock, shares outstanding	11,743,218	11,743,218
Common Stock [Member]
Common Stock, votes per share | Vote	1	1
Common Stock, par value | $ / shares	$ 0.01	$ 0.01
Common Stock, shares authorized	62,000,000	62,000,000
Common Stock, shares issued	44,341,563	43,976,336
Common Stock, shares outstanding	32,706,757	32,341,530

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net revenues		$ 107,844	$ 103,118	$ 312,407	$ 293,586
Cost of revenues		51,966	56,148	154,822	162,166
Gross margin		55,878	46,970	157,585	131,420
Operating expenses:
Selling, general and administrative		22,422	22,719	63,020	61,322
Research and development		17,752	14,747	50,556	44,516
Litigation-related		0	6,500	0	6,500
Total operating expenses		40,174	43,966	113,576	112,338
Income from operations		15,704	3,004	44,009	19,082
Other income (expense), net:
Total unrealized gains (losses) on available-for-sale securities, net		20	0	(11)	(87)
Less: portion of (gains) losses recognized in other comprehensive income		(20)	1	11	90
Net credit gains recognized in earnings		0	1	0	3
Other income (expense), net		1,917	(569)	5,643	(325)
Total other income (expense), net		1,917	(568)	5,643	(322)
Income before income taxes		17,621	2,436	49,652	18,760
Provision for income taxes		1,038	641	4,716	1,395
Consolidated net income		16,583	1,795	44,936	17,365
Less: Net income (loss) attributable to noncontrolling interest		1	3	9	(19)
Net income attributable to Vicor Corporation		$ 16,582	$ 1,792	$ 44,927	$ 17,384
Net income per common share attributable to Vicor Corporation:
Basic		$ 0.37	$ 0.04	$ 1.01	$ 0.4
Diluted		$ 0.37	$ 0.04	$ 1	$ 0.39
Shares used to compute net income per common share attributable to Vicor Corporation:
Basic	[1]	44,433	44,031	44,275	43,986
Diluted		45,187	44,898	45,000	44,906
[1] Denominator represents the weighted average number of shares of Common Stock and Class B Common Stock outstanding.

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Consolidated net income		$ 16,583	$ 1,795	$ 44,936	$ 17,365
Foreign currency translation losses, net of tax	[1]	(77)	(94)	(267)	(672)
Unrealized gains (losses) on available-for-sale securities, net of tax	[1]	20	1,054	(11)	671
Other comprehensive (loss) income		(57)	960	(278)	(1)
Consolidated comprehensive income		16,526	2,755	44,658	17,364
Less: Comprehensive loss attributable to noncontrolling interest		(6)	(4)	(12)	(69)
Comprehensive income attributable to Vicor Corporation		$ 16,532	$ 2,759	$ 44,670	$ 17,433
[1] The deferred tax assets associated with foreign currency translation losses and unrealized gains (losses) on available-for-sale securities are completely offset by a tax valuation allowance as of September 30, 2023 and 2022 . Therefore, there is no income tax benefit (provision) recognized for the three and nine months ended September 30, 2023 and 2022 .

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Recognized income tax benefit (provision)	$ 0	$ 0	$ 0	$ 0

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Consolidated net income	$ 16,583	$ 1,795	$ 44,936	$ 17,365
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization			13,202	10,250
Stock-based compensation expense	3,458	2,829	9,287	7,445
Provision for doubtful accounts			43	5
Litigation-related expense	0	6,500	0	6,500
Amortization of Bond Premium			0	1,027
Credit gain on available-for-sale securities	0	(1)	0	(3)
Increase in long-term deferred revenue			1,235	1,420
Increase in other assets			(260)	(1,451)
Deferred income taxes			(61)	(52)
Decrease in long-term income taxes payable			(14)	(40)
Change in current assets and liabilities, net			(15,374)	(20,456)
Net cash provided by operating activities			52,994	22,010
Investing activities:
Sales or maturities of short-term investments			0	25,000
Additions to property, plant and equipment and internal-use software			(26,289)	(51,279)
Net cash used for investing activities			(26,289)	(26,279)
Financing activities:
Proceeds from employee stock plans			10,503	4,147
Net cash provided by financing activities			10,503	4,147
Effect of foreign exchange rates on cash			(35)	(198)
Net increase (decrease) in cash and cash equivalents			37,173	(320)
Cash and cash equivalents at beginning of period			190,611	182,418
Cash and cash equivalents at end of period	$ 227,784	$ 182,098	$ 227,784	$ 182,098

Condensed Consolidated Statem_5

Condensed 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] Common Stock [Member]
Beginning Balance at Dec. 31, 2021	$ 423,905	$ 439	$ 345,664	$ 217,633	$ (1,328)	$ (138,927)	$ 423,599	$ 306	$ 118
Issuance of Common Stock under employee stock plans	4,147	1	4,146				4,147
Stock-based compensation expense	7,445		7,445				7,445
Components of comprehensive income (loss), net of tax:
Net income (loss)	17,365			17,384			17,384	(19)
Other comprehensive income (loss)	(1)				49		49	(50)
Total comprehensive income (loss)	17,364						17,433	(69)
Ending Balance at Sep. 30, 2022	452,861	440	357,255	235,017	(1,279)	(138,927)	452,624	237	118
Beginning Balance at Jun. 30, 2022	445,104	440	352,253	233,225	(2,246)	(138,927)	444,863	241	118
Issuance of Common Stock under employee stock plans	2,173		2,173				2,173
Stock-based compensation expense	2,829		2,829				2,829
Components of comprehensive income (loss), net of tax:
Net income (loss)	1,795			1,792			1,792	3
Other comprehensive income (loss)	960				967		967	(7)
Total comprehensive income (loss)	2,755						2,759	(4)
Ending Balance at Sep. 30, 2022	452,861	440	357,255	235,017	(1,279)	(138,927)	452,624	237	118
Beginning Balance at Dec. 31, 2022	464,336	441	360,365	243,079	(988)	(138,927)	464,088	248	118
Issuance of Common Stock under employee stock plans	10,503	4	10,499				10,503
Stock-based compensation expense	9,287		9,287				9,287
Components of comprehensive income (loss), net of tax:
Net income (loss)	44,936			44,927			44,927	9
Other comprehensive income (loss)	(278)				(257)		(257)	(21)
Total comprehensive income (loss)	44,658						44,670	(12)
Ending Balance at Sep. 30, 2023	528,784	445	380,151	288,006	(1,245)	(138,927)	528,548	236	118
Beginning Balance at Jun. 30, 2023	501,019	443	368,914	271,424	(1,195)	(138,927)	500,777	242	118
Issuance of Common Stock under employee stock plans	7,781	2	7,779				7,781
Stock-based compensation expense	3,458		3,458				3,458
Components of comprehensive income (loss), net of tax:
Net income (loss)	16,583			16,582			16,582	1
Other comprehensive income (loss)	(57)				(50)		(50)	(7)
Total comprehensive income (loss)	16,526						16,532	(6)
Ending Balance at Sep. 30, 2023	$ 528,784	$ 445	$ 380,151	$ 288,006	$ (1,245)	$ (138,927)	$ 528,548	$ 236	$ 118

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 16,582	$ 1,792	$ 44,927	$ 17,384

Insider Trading Arrangements

Insider Trading Arrangements	9 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2023
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 (the “SEC”). 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, 2023 are not necessarily indicative of the results that may be expected for any other interim period or the year ending December 31, 2023. The balance sheet at December 31, 2022 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, 2022 filed by the Company with the SEC on February 28, 2023.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2023
Inventory Disclosure [Abstract]
Inventories	2. Inventories Inventories were as follows (in thousands): September 30, 2023 December 31, 2022 Raw materials $ 86,710 $ 82,181 Work-in-process 9,335 10,456 Finished goods 8,525 8,773 $ 104,570 $ 101,410

Long-Term Investments

Long-Term Investments	9 Months Ended
	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Long-Term Investments	3. Long-Term Investments As of September 30, 2023 and December 31, 2022 , the Company held one auction rate security with a par value of $ 3,000,000 and an estimated fair value of approximately $ 2,611,000 and $ 2,622,000 , respectively, 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, 2023 , 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, 2023. Details of our investments are as follows (in thousands): September 30, 2023 Cash and Cash Long-Term Equivalents Investment Measured at fair value: Available-for-sale debt securities: Money market funds $ 187,777 $ — Failed Auction Security — 2,611 Total 187,777 2,611 Other measurement basis: Cash on hand 40,007 — Total $ 227,784 $ 2,611 December 31, 2022 Cash and Cash Long-Term Equivalents Investment Measured at fair value: Available-for-sale debt securities: Money market funds $ 143,274 $ — Failed Auction Security — 2,622 Total 143,274 2,622 Other measurement basis: Cash on hand 47,337 — Total $ 190,611 $ 2,622 The following is a summary of the available-for-sale securities (in thousands): Gross Gross Estimated Unrealized Unrealized Fair September 30, 2023 Cost Gains Losses Value Failed Auction Security $ 3,000 — 389 $ 2,611 Gross Gross Estimated Unrealized Unrealized Fair December 31, 2022 Cost Gains Losses Value Failed Auction Security $ 3,000 — 378 $ 2,622 As of September 30, 2023 , the Failed Auction Security had been in an unrealized loss position for greater than 12 months. The amortized cost and estimated fair value of the available-for-sale securities on September 30, 2023, by type and contractual maturities, are shown below (in thousands): Estimated Cost Fair Value Failed Auction Security: Due in twenty years $ 3,000 $ 2,611

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	4. 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, 2023 (in thousands): Using Significant Quoted Prices Other Significant in Active Observable Unobservable Total Fair Markets Inputs Inputs Value as of (Level 1) (Level 2) (Level 3) September 30, 2023 Cash equivalents: Money market funds $ 187,777 $ — $ — $ 187,777 Long-term investment: Failed Auction Security — — 2,611 2,611 Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 2022 (in thousands): Using Significant Quoted Prices Other Significant in Active Observable Unobservable Total Fair Markets Inputs Inputs Value as of (Level 1) (Level 2) (Level 3) December 31, 2022 Cash equivalents: Money market funds $ 143,274 $ — $ — $ 143,274 Long-term investment: Failed Auction Security — — 2,622 2,622 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, 2023 was as follows (in thousands): Balance at the beginning of the period $ 2,622 Loss included in Other comprehensive income ( 11 ) Balance at the end of the period $ 2,611 Management utilized a probability weighted discounted cash flow model to determine the estimated fair value as of September 30, 2023 .

Revenues

Revenues	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenues	5. Revenues The following tables present the Company’s net revenues disaggregated by geography based on the location of the customer, by product line (in thousands): Three Months Ended September 30, 2023 Brick Products Advanced Products Total United States $ 21,279 $ 18,889 $ 40,168 Europe 10,392 5,808 16,200 Asia Pacific 17,024 33,623 50,647 All other 737 92 829 $ 49,432 $ 58,412 $ 107,844 Nine Months Ended September 30, 2023 Brick Products Advanced Products Total United States $ 60,764 $ 48,426 $ 109,190 Europe 24,893 15,869 40,762 Asia Pacific 46,998 112,686 159,684 All other 2,536 235 2,771 $ 135,191 $ 177,216 $ 312,407 Three Months Ended September 30, 2022 Brick Products Advanced Products Total United States $ 21,559 $ 9,303 $ 30,862 Europe 7,101 1,954 9,055 Asia Pacific 14,800 47,704 62,504 All other 456 241 697 $ 43,916 $ 59,202 $ 103,118 Nine Months Ended September 30, 2022 Brick Products Advanced Products Total United States $ 54,288 $ 32,711 $ 86,999 Europe 19,184 6,951 26,135 Asia Pacific 38,167 139,749 177,916 All other 2,157 379 2,536 $ 113,796 $ 179,790 $ 293,586 The following tables present the Company’s net revenues disaggregated by the category of revenue, by product line (in thousands): Three Months Ended Brick Products Advanced Products Total Direct customers, contract manufacturers and $ 27,748 $ 37,384 $ 65,132 Stocking distributors, net of sales allowances 21,461 9,673 31,134 Non-recurring engineering 223 6,726 6,949 Royalties — 4,269 4,269 Other — 360 360 $ 49,432 $ 58,412 $ 107,844 Nine Months Ended September 30, 2023 Brick Products Advanced Products Total Direct customers, contract manufacturers and $ 82,669 $ 134,953 $ 217,622 Stocking distributors, net of sales allowances 51,536 21,070 72,606 Non-recurring engineering 986 11,650 12,636 Royalties — 8,745 8,745 Other — 798 798 $ 135,191 $ 177,216 $ 312,407 Three Months Ended September 30, 2022 Brick Products Advanced Products Total Direct customers, contract manufacturers and $ 29,051 $ 53,033 $ 82,084 Stocking distributors, net of sales allowances 14,288 2,869 17,157 Non-recurring engineering 577 2,249 2,826 Royalties — 1,033 1,033 Other — 18 18 $ 43,916 $ 59,202 $ 103,118 Nine Months Ended September 30, 2022 Brick Products Advanced Products Total Direct customers, contract manufacturers and $ 77,018 $ 162,483 $ 239,501 Stocking distributors, net of sales allowances 35,960 9,715 45,675 Non-recurring engineering 818 5,543 6,361 Royalties — 1,995 1,995 Other — 54 54 $ 113,796 $ 179,790 $ 293,586 The following table presents the changes in certain contract assets and (liabilities) (in thousands): September 30, 2023 December 31, 2022 Change Short-term deferred revenue and customer prepayments $ ( 3,618 ) $ ( 13,197 ) $ 9,579 Long-term deferred revenue ( 1,380 ) ( 145 ) $ ( 1,235 ) Deferred expenses 30 577 $ ( 547 ) Sales allowances ( 2,553 ) ( 1,661 ) $ ( 892 ) Deferred expenses are included in Other current assets in the accompanying Condensed Consolidated Balance Sheets. 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. The Company recognized revenue of approximately $ 3,711,000 and $ 7,486,000 for the three and nine months ended September 30, 2023 , respectively, and $ 1,149,000 and $ 2,015,000 for the three and nine months ended September 30, 2022 that was included in deferred revenue at the beginning of the respective period.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [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, 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 Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Cost of revenues $ 693 $ 479 $ 1,749 $ 1,161 Selling, general and administrative 1,788 1,537 4,934 4,184 Research and development 977 813 2,604 2,100 Total stock-based compensation $ 3,458 $ 2,829 $ 9,287 $ 7,445 Compensation expense by type of award was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Stock options $ 3,161 $ 2,531 $ 8,358 $ 6,641 ESPP 297 298 929 804 Total stock-based compensation $ 3,458 $ 2,829 $ 9,287 $ 7,445

Rental Income

Rental Income	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Rental Income	7. Rental Income Income, net under the Company’s operating lease agreement, for its owned facility leased to a third party in California, was approximately $ 198,000 for each of the three month periods ended September 30, 2023 and 2022 and $ 594,000 for each of the nine month periods ended September 30, 2023 and 2022 .

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	8. Income Taxes The provision for income taxes 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 Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Provision for income taxes $ 1,038 $ 641 $ 4,716 $ 1,395 Effective income tax rate 5.9 % 26.3 % 9.5 % 7.4 % The effective tax rates were lower than the statutory tax rates for the three and nine months ended September 30, 2023 and 2022 primarily due to the Company’s full valuation allowance position against domestic deferred tax assets. The provision for income taxes for the three and nine months ended September 30, 2023 and 2022 included estimated federal, state and foreign income taxes in jurisdictions in which the Company does not have sufficient tax attributes. As of September 30, 2023 , the Company has a valuation allowance of approximately $ 47,413,000 against all net domestic 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. Despite recent positive operating results, the Company faces uncertainties in forecasting its operating results due to supply and factory capacity constraints, certain process issues with the production of Advanced Products and the unpredictability in certain markets. This operating uncertainty also makes it difficult to predict the availability and utilization of tax benefits over the next several years. As a result, management has concluded, as of September 30, 2023, it is more likely than not the Company’s net domestic deferred tax assets will not be realized, and a full valuation allowance against all net domestic deferred tax assets is still warranted as of September 30, 2023. 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 operating results continue, and the Company’s concerns about industry uncertainty and world events, supply and factory capacity constraints, and process issues with the production of Advanced Products are resolved, and the amount of tax benefits the Company is able to utilize to the point that the Company believes future taxable income can be more reliably forecasted, the Company may release all or a portion of the valuation allowance 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 Condensed Consolidated Statements of Operations, the effect of which would be an increase in reported net income. The Company was informed in September 2021 by the Internal Revenue Service of their intention to examine the Company’s 2019 Federal income tax return. The IRS is in the process of closing examination of the 2019 tax year with no material adjustments. There are no other audits or examinations in process in any other jurisdiction.

Net Income per Share

Net Income per Share	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Net Income per Share	9. 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 Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Numerator: Net income attributable to Vicor Corporation $ 16,582 $ 1,792 $ 44,927 $ 17,384 Denominator: Denominator for basic net income per share-weighted 44,433 44,031 44,275 43,986 Effect of dilutive securities: Employee stock options (2) 754 867 725 920 Denominator for diluted net income per share – adjusted 45,187 44,898 45,000 44,906 Basic net income per share $ 0.37 $ 0.04 $ 1.01 $ 0.40 Diluted net income per share $ 0.37 $ 0.04 $ 1.00 $ 0.39 (1) Denominator represents the weighted average number of shares of Common Stock and Class B Common Stock outstanding. (2) Options to purchase 1,012,045 and 1,473,749 shares of Common Stock for the three and nine months ended September 30, 2023 , respectively, and options to purchase 1,037,640 and 772,240 shares of Common Stock for the three and nine months ended September 30, 2022 , respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. Commitments and Contingencies At September 30, 2023 , the Company had approximately $ 14,416,000 of cancelable and non-cancelable capital expenditure commitments, principally for manufacturing equipment, and approximately $ 2,364,000 of capital expenditure items which had been received and included in Property, plant and equipment, net in the accompanying Condensed Consolidated Balance Sheets, but not yet paid for. 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 (the “District Court”) for the Eastern District of Texas. The complaint, as amended, alleged that the Company’s unregulated bus converters used in intermediate bus architecture power supply systems infringed 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, and collectively the “SynQor Patents”). The Company asserted counterclaims against SynQor alleging unfair competition and tortious interference with business relations (the “Counterclaims”). As a result of certain actions by the United States Patent and Trademark Office (“USPTO”) and the District Court, SynQor’s infringement allegations regarding the ‘021 patent and the ‘290 patent were dismissed from the case prior to the beginning of trial. Specifically, the USPTO invalidated all the asserted claims of the ‘021 patent and that decision was upheld on appeal on August 30, 2017. In addition, on October 5, 2022, the District Court issued an order involuntarily dismissing the ‘290 patent infringement allegations on grounds of equitable and judicial estoppel, in view of representations by SynQor to the District Court agreeing to such dismissal as a condition of lifting a prior stay of the lawsuit. On January 18, 2023, the United States Court of Appeals for the Federal Circuit issued a decision upholding a decision of the Patent Trial and Appeal Board of the USPTO invalidating all claims of the ‘290 patent. A trial in the District Court began on October 17, 2022 on the asserted claims of the ‘190 patent and the ‘702 patent, as well as on the Company’s Counterclaims. The District Court dismissed the Company’s Counterclaims on October 25, 2022. On October 26, 2022, the jury returned a verdict on SynQor’s patent infringement claims, finding that the Company willfully infringed the ‘702 patent, but did not infringe the ‘190 patent. The jury awarded SynQor damages in the amount of $ 6,500,000 for infringement of the ‘702 patent. All of the SynQor Patents expired in 2018. On December 23, 2022, SynQor filed in the District Court (a) a motion for judgment as a matter of law that the Company infringed the ‘190 patent, (b) a motion requesting the District Court to award SynQor treble damages, as well as pre- and post-judgment interest, (c) a motion requesting the District Court to award SynQor its attorneys’ fees, and (d) a motion for a new trial. On December 23, 2022, the Company filed in the District Court (a) a motion requesting judgment as a matter of law that it did not infringe the ‘702 patent, and (b) a motion requesting judgment with respect to its defenses of equitable estoppel and waiver. The Court has not yet acted on any of these motions. To the extent that the District Court ultimately rules against the Company with respect to any of the aforementioned motions, the Company anticipates appealing those rulings to the United States Court of Appeals for the Federal Circuit. The Company similarly anticipates appealing the District Court’s order dismissing the Company’s Counterclaims against SynQor. In accordance with applicable accounting standards, the Company recorded a litigation related accrual of $ 6,500,000 in the third quarter of 2022 as its estimate based on the jury award, using estimated outcomes ranging from $ 0 to treble damages plus attorney fees. In addition, the Company is involved in certain other litigation and claims incidental to the conduct of its business, both as a defendant and a plaintiff. While the outcome of such other lawsuits and claims against the Company cannot be predicted with certainty, management does not expect such litigation or claims will have a material adverse impact on the Company’s financial position or results of operations.

Impact of Recently Issued Accou

Impact of Recently Issued Accounting Standards	9 Months Ended
	Sep. 30, 2023
Accounting Changes and Error Corrections [Abstract]
Impact of Recently Issued Accounting Standards	11. Impact of Recently Issued Accounting Standards New pronouncements issued but not effective until after September 30, 2023 are not expected to have a material impact on the Company’s consolidated financial statements.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2023
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories were as follows (in thousands): September 30, 2023 December 31, 2022 Raw materials $ 86,710 $ 82,181 Work-in-process 9,335 10,456 Finished goods 8,525 8,773 $ 104,570 $ 101,410

Long-Term Investments (Tables)

Long-Term Investments (Tables)	9 Months Ended
	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Summary of Investment	Details of our investments are as follows (in thousands): September 30, 2023 Cash and Cash Long-Term Equivalents Investment Measured at fair value: Available-for-sale debt securities: Money market funds $ 187,777 $ — Failed Auction Security — 2,611 Total 187,777 2,611 Other measurement basis: Cash on hand 40,007 — Total $ 227,784 $ 2,611 December 31, 2022 Cash and Cash Long-Term Equivalents Investment Measured at fair value: Available-for-sale debt securities: Money market funds $ 143,274 $ — Failed Auction Security — 2,622 Total 143,274 2,622 Other measurement basis: Cash on hand 47,337 — Total $ 190,611 $ 2,622
Summary of Available-for-Sale Securities	The following is a summary of the available-for-sale securities (in thousands): Gross Gross Estimated Unrealized Unrealized Fair September 30, 2023 Cost Gains Losses Value Failed Auction Security $ 3,000 — 389 $ 2,611 Gross Gross Estimated Unrealized Unrealized Fair December 31, 2022 Cost Gains Losses Value Failed Auction Security $ 3,000 — 378 $ 2,622
Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturities	The amortized cost and estimated fair value of the available-for-sale securities on September 30, 2023, by type and contractual maturities, are shown below (in thousands): Estimated Cost Fair Value Failed Auction Security: Due in twenty years $ 3,000 $ 2,611

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 (in thousands): Using Significant Quoted Prices Other Significant in Active Observable Unobservable Total Fair Markets Inputs Inputs Value as of (Level 1) (Level 2) (Level 3) September 30, 2023 Cash equivalents: Money market funds $ 187,777 $ — $ — $ 187,777 Long-term investment: Failed Auction Security — — 2,611 2,611 Assets and liabilities measured at fair value on a recurring basis included the following as of December 31, 2022 (in thousands): Using Significant Quoted Prices Other Significant in Active Observable Unobservable Total Fair Markets Inputs Inputs Value as of (Level 1) (Level 2) (Level 3) December 31, 2022 Cash equivalents: Money market funds $ 143,274 $ — $ — $ 143,274 Long-term investment: Failed Auction Security — — 2,622 2,622
Change in Estimated Fair Values Calculated for Investment Valued on Recurring Basis Utilizing Level 3 Inputs	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, 2023 was as follows (in thousands): Balance at the beginning of the period $ 2,622 Loss included in Other comprehensive income ( 11 ) Balance at the end of the period $ 2,611

Revenues (Tables)

Revenues (Tables)	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Summary of Net Revenues Based On Geography Location	The following tables present the Company’s net revenues disaggregated by geography based on the location of the customer, by product line (in thousands): Three Months Ended September 30, 2023 Brick Products Advanced Products Total United States $ 21,279 $ 18,889 $ 40,168 Europe 10,392 5,808 16,200 Asia Pacific 17,024 33,623 50,647 All other 737 92 829 $ 49,432 $ 58,412 $ 107,844 Nine Months Ended September 30, 2023 Brick Products Advanced Products Total United States $ 60,764 $ 48,426 $ 109,190 Europe 24,893 15,869 40,762 Asia Pacific 46,998 112,686 159,684 All other 2,536 235 2,771 $ 135,191 $ 177,216 $ 312,407 Three Months Ended September 30, 2022 Brick Products Advanced Products Total United States $ 21,559 $ 9,303 $ 30,862 Europe 7,101 1,954 9,055 Asia Pacific 14,800 47,704 62,504 All other 456 241 697 $ 43,916 $ 59,202 $ 103,118 Nine Months Ended September 30, 2022 Brick Products Advanced Products Total United States $ 54,288 $ 32,711 $ 86,999 Europe 19,184 6,951 26,135 Asia Pacific 38,167 139,749 177,916 All other 2,157 379 2,536 $ 113,796 $ 179,790 $ 293,586
Summary of Net Revenues Disaggregated by Geography	The following tables present the Company’s net revenues disaggregated by the category of revenue, by product line (in thousands): Three Months Ended Brick Products Advanced Products Total Direct customers, contract manufacturers and $ 27,748 $ 37,384 $ 65,132 Stocking distributors, net of sales allowances 21,461 9,673 31,134 Non-recurring engineering 223 6,726 6,949 Royalties — 4,269 4,269 Other — 360 360 $ 49,432 $ 58,412 $ 107,844 Nine Months Ended September 30, 2023 Brick Products Advanced Products Total Direct customers, contract manufacturers and $ 82,669 $ 134,953 $ 217,622 Stocking distributors, net of sales allowances 51,536 21,070 72,606 Non-recurring engineering 986 11,650 12,636 Royalties — 8,745 8,745 Other — 798 798 $ 135,191 $ 177,216 $ 312,407 Three Months Ended September 30, 2022 Brick Products Advanced Products Total Direct customers, contract manufacturers and $ 29,051 $ 53,033 $ 82,084 Stocking distributors, net of sales allowances 14,288 2,869 17,157 Non-recurring engineering 577 2,249 2,826 Royalties — 1,033 1,033 Other — 18 18 $ 43,916 $ 59,202 $ 103,118 Nine Months Ended September 30, 2022 Brick Products Advanced Products Total Direct customers, contract manufacturers and $ 77,018 $ 162,483 $ 239,501 Stocking distributors, net of sales allowances 35,960 9,715 45,675 Non-recurring engineering 818 5,543 6,361 Royalties — 1,995 1,995 Other — 54 54 $ 113,796 $ 179,790 $ 293,586
Summary of Changes in Contract Assets And Liabilities	The following table presents the changes in certain contract assets and (liabilities) (in thousands): September 30, 2023 December 31, 2022 Change Short-term deferred revenue and customer prepayments $ ( 3,618 ) $ ( 13,197 ) $ 9,579 Long-term deferred revenue ( 1,380 ) ( 145 ) $ ( 1,235 ) Deferred expenses 30 577 $ ( 547 ) Sales allowances ( 2,553 ) ( 1,661 ) $ ( 892 )

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation Expense	Stock-based compensation expense was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Cost of revenues $ 693 $ 479 $ 1,749 $ 1,161 Selling, general and administrative 1,788 1,537 4,934 4,184 Research and development 977 813 2,604 2,100 Total stock-based compensation $ 3,458 $ 2,829 $ 9,287 $ 7,445
Summary of Compensation Expenses by Type of Award	Compensation expense by type of award was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Stock options $ 3,161 $ 2,531 $ 8,358 $ 6,641 ESPP 297 298 929 804 Total stock-based compensation $ 3,458 $ 2,829 $ 9,287 $ 7,445

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2023
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 Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Provision for income taxes $ 1,038 $ 641 $ 4,716 $ 1,395 Effective income tax rate 5.9 % 26.3 % 9.5 % 7.4 %

Net Income per Share (Tables)

Net Income per Share (Tables)	9 Months Ended
	Sep. 30, 2023
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 Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Numerator: Net income attributable to Vicor Corporation $ 16,582 $ 1,792 $ 44,927 $ 17,384 Denominator: Denominator for basic net income per share-weighted 44,433 44,031 44,275 43,986 Effect of dilutive securities: Employee stock options (2) 754 867 725 920 Denominator for diluted net income per share – adjusted 45,187 44,898 45,000 44,906 Basic net income per share $ 0.37 $ 0.04 $ 1.01 $ 0.40 Diluted net income per share $ 0.37 $ 0.04 $ 1.00 $ 0.39 (1) Denominator represents the weighted average number of shares of Common Stock and Class B Common Stock outstanding. (2) Options to purchase 1,012,045 and 1,473,749 shares of Common Stock for the three and nine months ended September 30, 2023 , respectively, and options to purchase 1,037,640 and 772,240 shares of Common Stock for the three and nine months ended September 30, 2022 , respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Raw materials	$ 86,710	$ 82,181
Work-in-process	9,335	10,456
Finished goods	8,525	8,773
Net balance	$ 104,570	$ 101,410

Long-Term Investments - Additio

Long-Term Investments - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
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	$ 2,611,000	$ 2,622,000

Long-Term Investments - Summary

Long-Term Investments - Summary of Investment (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	$ 227,784	$ 190,611
Other Long-term Investment [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	2,611	2,622
Auction Rate Securities [Member] | Other Long-term Investment [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	2,611	2,622
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	187,777	143,274
Estimate of Fair Value Measurement [Member] | Other Long-term Investment [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	2,611	2,622
Estimate of Fair Value Measurement [Member] | Auction Rate Securities [Member] | Other Long-term Investment [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	2,611	2,622
Estimate of Fair Value Measurement [Member] | Money market funds [Member] | Cash and Cash Equivalents [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	187,777	143,274
Portion at Other than Fair Value Measurement [Member] | Cash [Member] | Cash and Cash Equivalents [Member]
Debt Securities, Available-for-Sale [Line Items]
Estimated Fair Value	$ 40,007	$ 47,337

Long-Term Investments - Summa_2

Long-Term Investments - Summary of Available-for-Sale Securities (Detail) - Failed Auction Security [Member] - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Cost	$ 3,000,000	$ 3,000,000
Gross Unrealized Losses	389,000	378,000
Estimated Fair Value	$ 2,611,000	$ 2,622,000

Long-Term Investments - Amortiz

Long-Term Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturities (Detail) - Failed Auction Security [Member] $ in Thousands	Sep. 30, 2023 USD ($)
Debt Securities, Available-for-Sale [Line Items]
Due in twenty to forty years, Cost	$ 3,000
Due in twenty to forty years, Estimated Fair Value	$ 2,611

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Other Long-Term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	$ 2,611	$ 2,622
Failed Auction Security [Member] | Other Long-Term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	2,611	2,622
Money market funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	187,777	143,274
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	187,777	143,274
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Failed Auction Security [Member] | Other Long-Term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	$ 2,611	$ 2,622

Fair Value Measurements - Chang

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, 2023 USD ($)
Fair Value Disclosures [Abstract]
Balance at the beginning of the period	$ 2,622
Loss included in Other comprehensive income	(11)
Balance at the end of the period	$ 2,611

Revenues - Summary of Net Reven

Revenues - Summary of Net Revenues Disaggregated by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 107,844	$ 103,118	$ 312,407	$ 293,586
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	49,432	43,916	135,191	113,796
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	58,412	59,202	177,216	179,790
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	40,168	30,862	109,190	86,999
United States [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	21,279	21,559	60,764	54,288
United States [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	18,889	9,303	48,426	32,711
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	16,200	9,055	40,762	26,135
Europe [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,392	7,101	24,893	19,184
Europe [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,808	1,954	15,869	6,951
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	50,647	62,504	159,684	177,916
Asia Pacific [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	17,024	14,800	46,998	38,167
Asia Pacific [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	33,623	47,704	112,686	139,749
All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	829	697	2,771	2,536
All Other [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	737	456	2,536	2,157
All Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 92	$ 241	$ 235	$ 379

Revenues - Summary of Net Rev_2

Revenues - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 107,844	$ 103,118	$ 312,407	$ 293,586
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	49,432	43,916	135,191	113,796
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	58,412	59,202	177,216	179,790
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	65,132	82,084	217,622	239,501
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	27,748	29,051	82,669	77,018
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	37,384	53,033	134,953	162,483
Stocking distributors, net of sales allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	31,134	17,157	72,606	45,675
Stocking distributors, net of sales allowances [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	21,461	14,288	51,536	35,960
Stocking distributors, net of sales allowances [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	9,673	2,869	21,070	9,715
Non-recurring engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,949	2,826	12,636	6,361
Non-recurring engineering [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	223	577	986	818
Non-recurring engineering [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,726	2,249	11,650	5,543
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,269	1,033	8,745	1,995
Royalties [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Royalties [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,269	1,033	8,745	1,995
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	360	18	798	54
Other [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 360	$ 18	$ 798	$ 54

Revenues - Summary of Changes i

Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Short-term deferred revenue and customer prepayments	$ (3,618)	$ (13,197)
Long-term deferred revenue	(1,380)	(145)
Deferred expenses	30	577
Sales allowances	(2,553)	$ (1,661)
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Short-term deferred revenue and customer prepayments	9,579
Long-term deferred revenue	(1,235)
Deferred expenses	(547)
Sales allowances	$ (892)

Revenues - Additional Informati

Revenues - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Deferred Revenue, Revenue Recognized	$ 3,711,000	$ 1,149,000	$ 7,486,000	$ 2,015,000

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 3,458	$ 2,829	$ 9,287	$ 7,445
Cost of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	693	479	1,749	1,161
Selling, General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	1,788	1,537	4,934	4,184
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 977	$ 813	$ 2,604	$ 2,100

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Compensation Expense by Type of Award (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 3,458	$ 2,829	$ 9,287	$ 7,445
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	3,161	2,531	8,358	6,641
ESPP [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 297	$ 298	$ 929	$ 804

Rental Income - Additional info

Rental Income - Additional information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Lease income	$ 198,000	$ 198,000	$ 594,000	$ 594,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	Sep. 30, 2023 USD ($)
Income Tax Disclosure [Abstract]
Valuation allowance, deferred tax assets	$ 47,413,000

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes and Effective Income Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 1,038	$ 641	$ 4,716	$ 1,395
Effective income tax rate	5.90%	26.30%	9.50%	7.40%

Net Income per Share - Summary

Net Income per Share - Summary of 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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income attributable to Vicor Corporation		$ 16,582	$ 1,792	$ 44,927	$ 17,384
Denominator:
Denominator for basic net income per share-weighted average shares	[1]	44,433	44,031	44,275	43,986
Effect of dilutive securities:
Employee stock options	[2]	754	867	725	920
Denominator for diluted net income per share - adjusted weighted-average shares and assumed conversions		45,187	44,898	45,000	44,906
Basic net income per share		$ 0.37	$ 0.04	$ 1.01	$ 0.4
Diluted net income per share		$ 0.37	$ 0.04	$ 1	$ 0.39
[1] Denominator represents the weighted average number of shares of Common Stock and Class B Common Stock outstanding. Options to purchase 1,012,045 and 1,473,749 shares of Common Stock for the three and nine months ended September 30, 2023 , respectively, and options to purchase 1,037,640 and 772,240 shares of Common Stock for the three and nine months ended September 30, 2022 , respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.

Net Income per Share - Summar_2

Net Income per Share - Summary of Computation Of Basic And Diluted Net Income (Loss) Per Share (Parenthetical) (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Options to purchase shares of Common Stock not included in the computation of diluted income (loss) per share	1,012,045	1,037,640	1,473,749	772,240

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2023 USD ($)
Loss Contingencies [Line Items]
Capital expenditure commitments	$ 14,416,000
Capital expenditures incurred but not yet paid	2,364,000
Litigation related accrual amount	6,500,000
Estimated outcomes amount	0
Infringement of 702 Patent [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value	$ 6,500,000