Vicor (VICR) 10-K 1 Mar 22 2021 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 16, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Registrant Name	VICOR CORPORATION
Entity Central Index Key	0000751978
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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 Annual Report	true
Document Transition Report	false
Entity 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
Entity Public Float			$ 2,212,125,000
ICFR Auditor Attestation Flag	true
Auditor Name	KPMG LLP
Auditor Firm ID	185
Auditor Location	Boston, MA
Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		32,172,825
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,758,218

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 182,418	$ 161,742
Short-term Investments	45,215	50,166
Accounts receivable, less allowance of $82 in 2021 and 2020	55,097	40,999
Inventories, net	67,322	57,269
Other current assets	6,708	6,756
Total current assets	356,760	316,932
Deferred tax assets	208	226
Long-term investment, net	2,639	2,517
Property, plant and equipment, net	115,975	74,843
Other assets	1,623	1,721
Total assets	477,205	396,239
Current liabilities:
Accounts payable	21,189	14,121
Accrued compensation and benefits	12,753	14,094
Accrued expenses	4,158	2,624
Sales allowances	1,464	597
Short-term lease liabilities	1,551	1,629
Income taxes payable	66	139
Short-term deferred revenue and customer prepayments	7,912	7,309
Total current liabilities	49,093	40,513
Long-term deferred revenue	413	733
Long-term income taxes payable	569	643
Long-term lease liabilities	3,225	2,968
Contingent consideration obligations	0	227
Total liabilities	53,300	45,084
Commitments and contingencies (Note 15)
Vicor Corporation stockholders' equity:
Additional paid-in capital	345,664	328,392
Retained earnings	217,633	161,008
Accumulated other comprehensive loss	(1,328)	(204)
Treasury stock at cost: 11,634,806 shares in 2021 and 2020	(138,927)	(138,927)
Total Vicor Corporation stockholders' equity	423,599	350,820
Noncontrolling interest	306	335
Total equity	423,905	351,155
Total liabilities and equity	477,205	396,239
Class B Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	118	118
Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	$ 439	$ 433

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) $ in Thousands	Dec. 31, 2021USD ($)Vote$ / sharesshares	Dec. 31, 2020USD ($)Vote$ / sharesshares
Accounts receivable, allowance | $	$ 82	$ 82
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	$ 1	$ 1
Common Stock, shares authorized	14,000,000	14,000,000
Common Stock, shares issued	11,758,218	11,758,218
Common Stock, shares outstanding	11,758,218	11,758,218
Common Stock [Member]
Common Stock, votes per share | Vote	1	1
Common Stock, par value | $ / shares	$ 1	$ 1
Common Stock, shares authorized	62,000,000	62,000,000
Common Stock, shares issued	43,789,528	43,204,671
Common Stock, shares outstanding	32,154,722	31,569,865

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net revenues		$ 359,364	$ 296,576	$ 262,977
Cost of revenues		181,164	165,129	140,011
Gross margin		178,200	131,447	122,966
Operating expenses:
Selling, general and administrative		69,484	63,163	62,557
Research and development		53,114	50,916	46,588
Total operating expenses		122,598	114,079	109,145
Income from operations		55,602	17,368	13,821
Other income (expense), net:
Total unrealized gains (losses) on available-for-sale securities, net		122	7	(16)
Portion of (gains) losses recognized in other comprehensive income		(118)	(3)	20
Net credit gains recognized in earnings		4	4	4
Other income (expense), net		1,199	1,089	1,062
Total other income (expense), net		1,203	1,093	1,066
Income before income taxes		56,805	18,461	14,887
Less: Provision for income taxes		176	539	778
Consolidated net income		56,629	17,922	14,109
Less: Net income attributable to noncontrolling interest		4	12	11
Net income attributable to Vicor Corporation		$ 56,625	$ 17,910	$ 14,098
Net income per common share attributable to Vicor Corporation:
Basic		$ 1.30	$ 0.42	$ 0.35
Diluted		$ 1.26	$ 0.41	$ 0.34
Shares used to compute net income per common share attributable to Vicor Corporation:
Basic	[1]	43,651	42,186	40,330
Diluted	[2]	44,966	43,869	41,677
[1]	Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding.
[2]	Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding for the year, adjusted to include the dilutive effect, if any, of outstanding options.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net income		$ 56,629	$ 17,922	$ 14,109
Foreign currency translation (losses) gains, net of tax benefit (1)	[1]	(425)	200	33
Unrealized losses on available-for-sale securities, net of tax (1)	[1]	(732)	(6)	(20)
Other comprehensive (loss) income		(1,157)	194	13
Consolidated comprehensive income		55,472	18,116	14,122
Less: Comprehensive (loss) income attributable to noncontrolling interest		(29)	27	13
Comprehensive income attributable to Vicor Corporation		$ 55,501	$ 18,089	$ 14,109
[1]	The deferred tax assets associated with cumulative foreign currency translation gains and cumulative unrealized losses on available for sale securities are completely offset by a tax valuation allowance as of December 31, 2021, 2020, and 2019. Therefore, there is no income tax benefit (provision) recognized in any of the three years ended December 31, 2021.

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Recognized income tax benefit (provision)	$ 0	$ 0	$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Consolidated net income	$ 56,629	$ 17,922	$ 14,109
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	11,705	11,056	10,334
Stock-based compensation expense	7,035	5,883	3,036
(Decrease) increase in long-term deferred revenue	(320)	(321)	822
(Decrease) increase in long-term income taxes payable	(74)	76	329
Deferred income taxes	18	(21)	60
Provision (recovery) for doubtful accounts	0	23	(144)
Credit gain on available-for-sale securities	(4)	(4)	(4)
(Decrease) increase in contingent consideration obligations	(74)	0	280
(Decrease) increase in other assets	(43)	182	(35)
Change in current assets and liabilities, net	(20,428)	(54)	(6,576)
Net cash provided by operating activities	54,444	34,742	22,211
Investing activities:
Purchases of short-term investments	(70,900)	(50,166)	0
Additions to property, plant and equipment	(47,761)	(28,653)	(12,485)
Sales and maturities of short-term investments	75,000	0	0
Net cash used for investing activities	(43,661)	(78,819)	(12,485)
Financing activities:
Proceeds from employee stock plans	10,243	11,585	4,742
Proceeds from public offering of Common Stock	0	109,681	0
Payment of contingent consideration obligations	(153)	(224)	(237)
Noncontrolling interest dividend paid	0	0	(139)
Net cash provided by financing activities	10,090	121,042	4,366
Effect of foreign exchange rates on cash	(197)	109	19
Net increase in cash and cash equivalents	20,676	77,074	14,111
Cash and cash equivalents at beginning of year	161,742	84,668	70,557
Cash and cash equivalents at end of year	182,418	161,742	84,668
Change in current assets and liabilities:
Accounts receivable	(14,301)	(2,816)	5,714
Inventories, net	(10,134)	(8,049)	(1,812)
Other current assets	10	369	(2,895)
Accounts payable and accrued liabilities	2,503	8,668	(7,339)
Accrued severance and other charges	93	0	(234)
Short-term lease payable	4	34	12
Income taxes payable	(73)	82	(653)
Deferred revenue	1,470	1,658	631
Change in current assets and liabilities, net	(20,428)	(54)	(6,576)
Supplemental disclosures:
Cash paid during the year for income taxes, net of refunds	$ 645	$ 79	$ 2,194

Consolidated Statements of Equi

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, 2018	$ 184,090	$ 402	$ 193,457	$ 129,000	$ (394)	$ (138,927)	$ 183,656	$ 434	$ 118
Issuance of Common Stock under employee stock plans	4,742	3	4,739				4,742
Stock-based compensation expense	3,036		3,036				3,036
Noncontrolling interest dividend paid	(139)							(139)
Other	19		19				19
Components of comprehensive income, net of tax
Net income	14,109			14,098			14,098	11
Other comprehensive income	13				11		11	2
Total comprehensive income	14,122						14,109	13
Ending Balance at Dec. 31, 2019	205,870	405	201,251	143,098	(383)	(138,927)	205,562	308	118
Issuance of Common Stock under employee stock plans	11,585	10	11,575				11,585
Issuance of Common Stock in public offering, net (See Note 12)	109,681	18	109,663				109,681
Stock-based compensation expense	5,883		5,883				5,883
Other	20		20				20
Components of comprehensive income, net of tax
Net income	17,922			17,910			17,910	12
Other comprehensive income	194				179		179	15
Total comprehensive income	18,116						18,089	27
Ending Balance at Dec. 31, 2020	351,155	433	328,392	161,008	(204)	(138,927)	350,820	335	118
Issuance of Common Stock under employee stock plans	10,243	6	10,237				10,243
Stock-based compensation expense	7,035		7,035				7,035
Components of comprehensive income, net of tax
Net income	56,629			56,625			56,625	4
Other comprehensive income	(1,157)				(1,124)		(1,124)	(33)
Total comprehensive income	55,472						55,501	(29)
Ending Balance at Dec. 31, 2021	$ 423,905	$ 439	$ 345,664	$ 217,633	$ (1,328)	$ (138,927)	$ 423,599	$ 306	$ 118

Description of Business

Description of Business	12 Months Ended
	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	1. DESCRIPTION OF BUSINESS Vicor Corporation (the “Company” or “Vicor”) designs, develops, manufactures, and markets modular power components and power systems for converting electrical power. The Company also licenses certain rights to its technology in return for recurring royalties. The principal markets for the Company’s power converters and systems are large original equipment manufacturers (“OEMs”), original design manufacturers (“ODMs”) and their contract manufacturers, and smaller, lower volume users, which are broadly distributed across several major market areas.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Significant Accounting Policies	2. SIGNIFICANT ACCOUNTING POLICIES Principles of consolidation The Consolidated Financial Statements include the accounts of the Company and its subsidiaries. All intercompany transactions and balances have been eliminated upon consolidation. Use of estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingencies at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Such estimates and assumptions relate to the useful lives of fixed assets and identified intangible assets, recoverability of long-lived assets, fair value of short-term and long-term investments, allowances for doubtful accounts, potential excess, obsolete or unmarketable inventory, potential reserves relating to litigation matters, accrued liabilities, accrued taxes, deferred tax valuation allowances, assumptions pertaining to share-based payments, and other reserves. Actual results could differ from those based on these estimates and assumptions, and such differences may be material to the financial statements. Foreign currency translation The financial statements of Vicor Japan Company, Ltd. (“VJCL”), a majority-owned subsidiary, for which the functional currency is the Japanese Yen, have been translated into U.S. Dollars using the exchange rate in effect at the balance sheet date for balance sheet amounts and the average exchange rates in effect during the year for income statement amounts. The gains and losses resulting from the changes in exchange rates from year to year have been reported in other comprehensive income. Transaction gains and losses resulting from the remeasurement of foreign currency denominated assets and liabilities of the Company’s foreign subsidiaries where the functional currency is the U.S. Dollar are included in other income (expense), net. Foreign currency (losses) gains included in other income (expense), net, w e Investments The Company’s principal sources of liquidity are its existing balances of cash and cash equivalents and short-term investments, as well as cash generated from operations. Consistent with the guidelines of the Company’s investment policy, the Company can invest, and has historically invested, its cash balances in demand deposit accounts, money market funds, government debt securities, and auction rate securities meeting certain quality criteria. Cash and Cash Equivalents Cash and cash equivalents are highly liquid investments with insignificant interest rate risk and maturities of 90 days or less at the time of acquisition. Cash and cash equivalents include funds held in disbursement (i.e., checking) and money market accounts, certificates of deposit, and debt securities with maturities of less than three months at the time of purchase. Cash and cash equivalents are valued at cost, approximating market value. The Company’s money market securities are purchased and redeemed at par value. Their estimated fair value is equal to their cost, and, due to the nature of the securities and their classification as cash equivalents, there are no unrealized gains or losses recorded at the balance sheet dates. Short-term Investments The Company’s short-term investments, consisting of obligations of the U.S. Treasury, are debt securities with original maturities greater than three months but less than one year at the time of purchase. Long-term Investment The Company’s long-term investment is an auction rate debt security with a maturity of greater than one year and is subject to credit, liquidity, market, and interest rate risk. Available-For-Sale Certain of the cash and cash equivalents, all of the short-term investments and the long-term investment are classified as available-for-sale non-credit The Company periodically evaluates the long-term investment to determine if impairment is required, whether an impairment is other than temporary, and the measurement of an impairment loss. The Company considers a variety of impairment indicators such as, but not limited to, a significant deterioration in the earnings performance, credit rating, or asset quality of the investment. The amortized cost of the debt securities are adjusted for amortization of premiums and accretion of discounts to maturity, the net amount of which, along with interest and realized gains and losses, is included in “Other income (expense), net” in the Consolidated Statements of Operations. 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 that 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: Level 1 Inputs used to measure fair value are unadjusted quoted prices available in active markets for the identical assets or liabilities as of the reporting date. Level 2 Inputs used to measure fair value, other than quoted prices included in Level 1, are either directly or indirectly observable as of the reporting date through correlation with market data, including quoted prices for similar assets and liabilities in active markets and quoted prices in inactive markets. Level 2 also includes assets and liabilities valued using models or other pricing methodologies that do not require significant judgment since the input assumptions used in the models, such as interest rates and volatility factors, are corroborated by readily observable data from actively quoted markets for substantially the full term of the financial instrument. Level 3 Inputs used to measure fair value are unobservable inputs supported by little or no market activity and reflect the use of significant management judgment. These values are generally determined using pricing models for which the assumptions utilize management’s estimates of market participant assumptions. The carrying amounts of cash and cash equivalents, short-term investments, accounts receivable, and accounts payable approximate fair value because of the short maturities of these financial instruments. Inventories Inventories are valued at the lower of cost (determined using the first-in, first-out Inventory estimated to be excess, obsolete, or unmarketable is written down to net realizable value. The Company’s estimation process for assessing net realizable value is based upon management’s estimate of expected future utility which is derived based on backlog, historical consumption and expected market conditions. If the Company’s estimated demand and/or market expectations 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. Concentrations of risk Financial instruments potentially subjecting the Company to significant concentrations of credit risk consist principally of cash and cash equivalents and short-term investments, of which a significant portion are held by three financial institutions, its long-term investment, and trade accounts receivable. The Company maintains cash and cash equivalents, short-term investments and certain other financial instruments with high credit counterparties, and continuously monitors the amount of credit exposure to any one issuer and diversifies its investments in order to minimize its credit risk. Generally, amounts invested with these financial institutions are in excess of federal deposit insurance limits. The Company has not experienced any losses in such accounts, and management believes the Company is not exposed to significant credit risk. The Company’s long-term investment as of December 31, 2021 consists of a single auction rate security with a par value of $3,000,000, which is collateralized by student loans. It is a highly rated (Aaa/AA+) municipal and corporate debt security. Through December 31, 2021, auctions held for the Company’s auction rate security have failed. The funds associated with an auction rate security that has failed auction may not be accessible until a successful auction occurs, a buyer is found outside of the auction process, the security is called, or the underlying securities have matured. If the credit rating of the issuer of the auction rate security held deteriorates, the Company may be required to adjust the carrying value of the investment for an other-than-temporary decline in value through an impairment charge. The Company’s investment policy, approved by the Board of Directors, limits the amount the Company may invest in any issuer, thereby reducing credit risk concentrations. The Company’s products are sold worldwide to customers ranging from smaller, independent manufacturers of highly specialized electronic devices, to larger OEMs, ODMs and their contract manufacturers. See Note 17, Segment Information Components and materials used in the Company’s products are purchased from a variety of vendors. While most of the components are available from multiple sources, some key components for certain Advanced Products, in particular, are supplied by single vendors. In instances of single source items, the Company maintains levels of inventories management considers appropriate to enable meeting the delivery requirements of customers. If suppliers or subcontractors cannot provide their products or services on time or to the required specifications, the Company may not be able to meet the demand for its products and its delivery times may be negatively affected. Long-lived assets The Company reviews property, plant and equipment and finite-lived intangible assets for impairment whenever events or changes in circumstances indicate the carrying value of such assets may not be recoverable. Management determines whether the carrying value of an asset or asset group is recoverable based on comparison to the undiscounted expected future cash flows the assets are expected to generate over their remaining economic lives. If an asset value is not recoverable, the impairment loss is equal to the amount by which the carrying value of the asset exceeds its fair value, which is determined by either a quoted market price, if any, or a value determined by utilizing a discounted cash flow technique. Evaluation of impairment of long-lived assets requires estimates of future operating results that are used in the preparation of the expected future undiscounted cash flows. Actual future operating results and the remaining economic lives of our long-lived assets could differ from the estimates used in assessing the recoverability of these assets. These differences could result in impairment charges, which could be material. Intangible assets Values assigned to patents are amortized using the straight-line method over periods ranging from three to 20 years. Patents and other intangible assets are included in “Other assets” in the accompanying Consolidated Balance Sheets. Product warranties The Company generally offers a two-year Revenue recognition Revenue is recognized when control of the promised goods or services is transferred to a customer, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. Sales, value add, and other taxes collected concurrent with revenue producing activities are excluded from revenue. The expected costs associated with product warranties continue to be recognized at the time product revenue is recognized. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of revenues. The Company’s primary source of net revenue comes from the sale of products, which are modular power components and power systems for converting, regulating and controlling electric current. The principal customers for the Company’s power converters and systems are large OEMs, ODMs and the original design manufacturers and contract manufacturers serving them, and smaller, lower volume users, which are broadly distributed across several major market areas. The Company recognizes revenue for product sales at a point in time following the transfer of control of such products to the customer, including sales to stocking distributors, which typically occurs upon shipment or delivery, depending on the terms of the underlying contract. The Company establishes sales allowances on shipments to stocking distributors for estimated future product returns including distributor returns and price adjustment credits, primarily based upon historical and anticipated rates of product returns and allowances. Certain contracts with customers contain multiple performance obligations, which typically may include a combination of non-recurring The Company licenses its intellectual property under right to use licenses, in which royalties due to the Company are based upon a percentage of the licensee’s sales. The Company utilizes the exception under the revenue recognition guidance for the recognition of sales- or usage-based royalties, in which the royalties are not recognized until the later of when 1) the customer’s subsequent sales or usages occur, or 2) the performance obligation to which some or all of the sales- or usage-based royalty has been allocated is satisfied or partially satisfied. Accounts receivable includes amounts billed and currently due from customers. The amounts due are stated at their estimated realizable value. The Company’s payment terms vary by the type and location of its customers and the products or services offered, although terms generally include a requirement of payment within 30 to 60 days. The Company maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments, based on assessments of customers’ credit-risk profiles and payment histories. If the financial condition of the Company’s customers were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required. The Company does not require collateral from its customers, although there have been circumstances when the Company has required cash in advance (i.e., a partial down-payment) to facilitate orders in excess of a customer’s established credit limit. To date, such amounts have not been material. The Company records deferred revenue, which represents a contract liability, when cash payments are received or due in advance of performance under a contract with a customer. During the years ended December 31, 2021 and 2020, the Company recognized revenue of approximately $4,087,000 and $3,550,000, respectively, that was included in deferred revenue at the beginning of the respective period. The Company applies the practical expedient for the incremental costs of obtaining a contract for sales commissions, which are expensed when incurred because the amortization period is generally less than one year. These costs are included in selling, general and administrative expenses. The Company also applies another practical expedient and does not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less. Advertising expense The cost of advertising is expensed as incurred. The Company incurred approximately $2,994,000, $2,637,000, and $2,749,000 in advertising costs during 2021, 2020, and 2019, respectively. Legal Costs Legal costs in connection with litigation are expensed as incurred. 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. For stock options with time-based vesting provisions, the calculated compensation expense, net of expected forfeitures, is recognized on a straight-line basis over the service period of the award, which is generally five years for stock options. For stock options with performance-based vesting provisions, recognition of compensation expense, net of expected forfeitures, commences if and when the achievement of the performance criteria is deemed probable. For stock options with performance-based vesting provisions, compensation expense, net of expected forfeitures, when recognized, is recognized over the relevant performance period. Income taxes Deferred tax assets and liabilities are determined based on the differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted income tax rates and laws expected to be in effect when the temporary differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance if management determines it is more likely than not that some portion or all of the deferred tax assets will not be realized. All deferred tax assets and liabilities are classified as noncurrent. The Company follows a two-step “more-likely-than-not” “more-likely-than-not” Net income per common share The Company computes basic net income per share using the weighted average number of common shares outstanding and diluted net income per share using the weighted average number of common shares outstanding plus the effect of outstanding dilutive stock options, if any. The following table sets forth the computation of basic and diluted net income per share for the years ended December 31 (in thousands, except per share amounts): 2021 2020 2019 Numerator: Net income attributable to Vicor Corporation $ 56,625 $ 17,910 $ 14,098 Denominator: Denominator for basic net income per share- weighted average shares (1) 43,651 42,186 40,330 Effect of dilutive securities: Employee stock options (2) 1,315 1,683 1,347 Denominator for diluted net income per share- adjusted weighted-average shares and assumed conversions (3) 44,966 43,869 41,677 Basic net income per share $ 1.30 $ 0.42 $ 0.35 Diluted net income per share $ 1.26 $ 0.41 $ 0.34 (1) Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding. (2) Options to purchase 60,736, 181,196 and 164,367 shares of Common Stock in 2021, 2020, and 2019, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive. (3) Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding for the year, adjusted to include the dilutive effect, if any, of outstand i Comprehensive income (loss) The components of comprehensive income (loss) include, in addition to consolidated net income (loss), unrealized gains and losses on investments, net of tax and foreign currency translation adjustments related to VJCL, net of tax. Impact of recently issued accounting standards In December 2019, the FASB issued guidance designed to simplify the accounting for income taxes by eliminating certain exceptions to the general principles in Topic 740, Income Taxes Other new pronouncements issued but not effective until after December 31, 2021 are not expected to have a material impact on the Company’s consolidated financial statements.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2021
Inventory Disclosure [Abstract]
Inventories	3. INVENTORIES Inventories as of December 31 were as follows (in thousands): 2021 2020 Raw materials $ 51,289 $ 42,556 Work-in-process 12,514 7,424 Finished goods 3,519 7,289 $ 67,322 $ 57,269

Short-Term and Long-Term Invest

Short-Term and Long-Term Investments	12 Months Ended
	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Short-Term and Long-Term Investments	4. SHORT-TERM AND LONG-TERM INVESTMENTS As of December 31, 2021 and 2020, the Company held $45,215,000 and $50,166,000 , As of December 31, 2021 and 2020, the Company held one auction rate security with a par value of $3,000,000 and an estimated fair value of approximately $2,639,000 , and $2,517,000, 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 December 31, 2021, 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. Changes in the estimated fair value of the Failed Auction Security have not been significant in the past three years. However, current conditions in the auction rate securities market have led management to conclude the recovery period for the Failed Auction Security At this time, the Company has no intent to sell the Failed Auction Security and does not believe it is more likely than not the Company will be required to sell the 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 Consolidated Statement of Operations, and any such impairment adjustments may be material. Details of our investments are as follows (in thousands): December 31, 2021 Cash and Short-Term Long-Term Measured at fair value: Available-for-sale Money Market Funds $ 94,282 $ — $ — U.S. Treasury Obligations — 45,215 — Failed Auction Security — — 2,639 Total 94,282 45,215 2,639 Other measurement basis: Cash on hand 88,136 — — Total $ 182,418 $ 45,215 $ 2,639 December 31, 2020 Cash and Short-Term Long-Term Measured at fair value: Available-for-sale Money Market Funds $ 69,493 $ — $ — U.S. Treasury Obligations 19,998 50,166 — Failed Auction Security — — 2,517 Total 89,491 50,166 2,517 Other measurement basis: Cash on hand 72,251 — — Total $ 161,742 $ 50,166 $ 2,517 The following is a summary of the available-for-sale December 31, 2021 Cost Gross Gross Estimated U.S. Treasury Obligations $ 45,238 $ — $ 23 $ 45,215 Failed Auction Security 3,000 — 361 2,639 December 31, 2020 U.S. Treasury Obligations $ 70,172 $ — $ 8 $ 70,164 Failed Auction Security 3,000 — 483 2,517 As of December 31, 2021 and 2020, 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 U.S. Treasury Obligations: Cost Estimated Fair Maturities greater than three months but less than one year $ 45,238 $ 45,215 Failed Auction Security: Cost Estimated Fair Due in twenty to forty years $ 3,000 $ 2,639

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2021
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 December 31, 2021 (in thousands): Using Quoted Prices Significant Significant Total Fair Cash equivalents: Money market funds $ 94,282 $ — $ — $ 94,282 Short-term investments: U.S. Treasury Obligations 45,215 — — 45,215 Long-term investments: Failed Auction Security — — 2,639 2,639 Assets measured at fair value on a recurring basis included the following as of December 31, 2020 (in thousands): Using Quoted Prices Significant Significant Total Fair Cash equivalents: Money market funds $ 69,493 $ — $ — $ 69,493 U.S. Treasury Obligations 19,998 — — 19,998 Short-term investments: U.S. Treasury Obligations 50,166 — — 50,166 Long-term investments: Failed Auction Security — — 2,517 2,517 Liabilities: Contingent consideration obligations — — (227 ) (227 ) 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 year ended December 31, 2021 was as follows (in thousands): Balance at the beginning of the period $ 2,517 Credit gain on available-for-sale 4 Gain included in Other comprehensive income 118 Balance at the end of the period $ 2,639 Management utilized a probability weighted discounted cash flow model to determine the estimated fair value of this investment as of December 31, 2021.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	6. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are stated at cost and are depreciated and amortized over a period of three Property, plant and equipment as of December 31 were as follows (in thousands): 2021 2020 Land $ 3,600 $ 3,600 Buildings and improvements 50,138 45,905 Machinery and equipment 247,926 233,635 Furniture and fixtures 9,825 8,429 Construction in-progress 48,088 17,987 359,577 309,556 Accumulated depreciation and amortization (248,226 ) (239,162 ) Right of use asset — net 4,624 4,449 Net balance $ 115,975 $ 74,843 Depreciation expense for the years ended December 31, 2021, 2020 and 2019 was approximately $11,609,000, $10,950,000, and $10,226,000, respectively. As of December 31, 2021, the Company had approximately $32,949,000 of capital expenditure commitments.

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	7. INTANGIBLE ASSETS Patent costs, which are included in Other assets in the accompanying Consolidated Balance Sheets, as of December 31 were as follows (in thousands): 2021 2020 Patent costs $ 1,686 $ 1,859 Accumulated amortization (1,354 ) (1,434 ) $ 332 $ 425 Definite lived intangible assets, such as patent rights, are amortized and tested for impairment if a triggering event occurs. Amortization expense was approximately $96,000, $106,000 and $108,000 in 2021, 2020 and 2019, respectively.

Product Warranties

Product Warranties	12 Months Ended
	Dec. 31, 2021
Guarantees and Product Warranties [Abstract]
Product Warranties	8. PRODUCT WARRANTIES Product warranty activity for the years ended December 31 was as follows (in thousands): 2021 2020 2019 Balance at the beginning of the period $ 308 $ 372 $ 268 Accruals for warranties for products sold in the period 158 366 250 Fulfillment of warranty obligations (151 ) (398 ) (140 ) Revisions of estimated obligations (23 ) (32 ) (6 ) Balance at the end of the period $ 292 $ 308 $ 372

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Stockholders' Equity	9. STOCKHOLDERS’ EQUITY Each share of Common Stock entitles the holder thereof to one vote on all matters submitted to the stockholders. Each share of Class B Common Stock entitles the holder thereof to ten votes on all such matters. Shares of Class B Common Stock are not transferable by a stockholder except to or among the stockholder’s spouse, certain of the stockholder’s relatives, and certain other defined transferees. Class B Common Stock is not listed or traded on any exchange or in any market. Class B Common Stock is convertible at the option of the holder thereof at any time and without cost to the stockholder into shares of Common Stock on a one-for-one In November 2000, the Board of Directors of the Company authorized the repurchase of up to $30,000,000 of the Company’s Common Stock (the “November 2000 Plan”). The plan authorizes the Company to make repurchases from time to time in the open market or through privately negotiated transactions. The timing of this program and the amount of the stock that may be repurchased is at the discretion of management based on its view of economic and financial market conditions. There were no repurchases under the November 2000 Plan in 2021, 2020, and 2019. On December 31, 2021, the Company had approximately $8,541,000 available for share repurchases under the November 2000 Plan. In June 2020, the Company completed an underwritten public offering of its Common Stock, resulting in the issuance of a total of 1,769,231 shares of registered Common Stock and net proceeds of approximately $109,714,000, after deduction of underwriting discounts and offering expenses. The Company has been using the net proceeds from the offering to expand its manufacturing facilities and for other general corporate purposes. Dividends are declared at the discretion of the Company’s Board of Directors and depend on actual cash from operations, the Company’s financial condition and capital requirements and any other factors the Company’s Board of Directors may consider relevant at the time. Common Stock and Class B Common Stock participate in dividends and earnings equally. On December 31, 2021, 2020, and 2019, there were 21,268,027, 21,852,334, and 20,895,747, respectively, shares of Vicor Common Stock reserved for issuance upon exercise of Vicor stock options, upon conversion of Class B Common Stock and under the ESPP.

Revenues

Revenues	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenues	10. REVENUES Revenue from the sale of Advanced Products represents the sum of third-party sales of the products sold under the Advanced Products line, which were sold under the former Picor Corporation (“Picor”) and VI Chip Corporation (“VI Chip”) operating segments during periods prior to the second quarter of 2019. Revenue from the sale of Brick Products represents the sum of third-party sales of the products sold under the Brick Products line, which were also sold under the former Brick Business Unit operating segment, inclusive of such sales of our Vicor Custom Power and VJCL subsidiaries. See Note 17, Segment Information The following tables present the Company’s net revenues disaggregated by geography based on the location of the customer, by product line (in thousands): Year Ended December 31, 2021 Brick Advanced Total United States $ 74,280 $ 44,360 $ 118,640 Europe 32,762 5,145 37,907 Asia Pacific 80,344 120,459 200,803 All other 1,758 256 2,014 $ 189,144 $ 170,220 $ 359,364 Year Ended December 31, 2020 Brick Advanced Total United States $ 80,065 $ 25,493 $ 105,558 Europe 23,491 6,641 30,132 Asia Pacific 83,985 73,899 157,884 All other 2,715 287 3,002 $ 190,256 $ 106,320 $ 296,576 Year Ended December 31, 2019 Brick Advanced Total United States $ 98,822 $ 22,806 $ 121,628 Europe 22,172 5,090 27,262 Asia Pacific 62,720 46,107 108,827 All other 4,182 1,078 5,260 $ 187,896 $ 75,081 $ 262,977 The following tables present the Company’s net revenues disaggregated by the category of revenue, by product line (in thousands): Year Ended December 31, 2021 Brick Advanced Total Direct customers, contract manufacturers and non-stocking $ 139,099 $ 144,180 $ 283,279 Stocking distributors, net of sales allowances 49,359 14,123 63,482 Non-recurring 686 10,027 10,713 Royalties — 1,819 1,819 Other — 71 71 $ 189,144 $ 170,220 $ 359,364 Year Ended December 31, 2020 Brick Advanced Total Direct customers, contract manufacturers and non-stocking $ 160,004 $ 91,405 $ 251,409 Stocking distributors, net of sales allowances 29,411 8,510 37,921 Non-recurring 841 6,181 7,022 Royalties — 152 152 Other — 72 72 $ 190,256 $ 106,320 $ 296,576 Year Ended December 31, 2019 Brick Advanced Total Direct customers, contract manufacturers and non-stocking $ 159,135 $ 63,567 $ 222,702 Stocking distributors, net of sales allowances 27,797 9,802 37,599 Non-recurring 843 1,614 2,457 Royalties 121 24 145 Other — 74 74 $ 187,896 $ 75,081 $ 262,977 The following table presents the changes in certain contract assets and (liabilities) (in thousands): December 31, December 31, Change Short-term deferred revenue and customer prepayments $ (7,912 ) $ (7,309 ) $ (603 ) Long-term deferred revenue (413 ) (733 ) 320 Deferred expenses 560 1,650 (1,090 ) Sales allowances (1,464 ) (597 ) (867 ) The increase in sales allowances was due to the increase in the year-to-date Deferred expenses are included in Other current assets, in the accompanying Consolidated Balance Sheets. Net revenues from unaffiliated customers by geographic region, based on the location of the customer, for the years ended December 31 were as follows (in thousands): 2021 2020 2019 United States $ 118,640 $ 105,558 $ 121,628 Europe 37,907 30,132 27,262 Asia Pacific 200,803 157,884 108,827 All other 2,014 3,002 5,260 $ 359,364 $ 296,576 $ 262,977 During 2021, 2020, and 2019, one customer accounted for approximately 14.9%, 18.5%, and 12.7% of net revenues, respectively, which included net revenues from both business product lines in each of the three years. Net revenues from customers in China (including Hong Kong), the Company’s largest international market, accounted for approximately 27.5% of total net revenues in 2021, 31.4% in 2020 and 22.1% in 2019, respectively.

Stock-Based Compensation and Em

Stock-Based Compensation and Employee Benefit Plans	12 Months Ended
	Dec. 31, 2021
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation and Employee Benefit Plans	11. STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS Vicor currently grants options for the purchase of Common Stock (i.e., “stock options”) under the following equity compensation plans that are stockholder-approved: Amended and Restated 2000 Stock Option and Incentive Plan, as amended and restated (the “2000 Plan”) non-employee non-qualified non-employee Vicor Corporation 2017 Employee Stock Purchase Plan (the “Plan” or the “ESPP”) to participate. The ESPP is intended to qualify as an “employee stock purchase plan” under Section 423 of the Internal Revenue Code. The ESPP operates in successive periods of approximately six months, each referred to as an “offering period.” Generally, offering periods commence on or around September 1 and March 1 and end on or around the following February 28 or August 31, respectively. Under the ESPP, an option is granted to participating employees on the first day of an offering period to purchase shares of the Company’s Common Stock at the end of that offering period at a purchase price equal to 85% of the lesser of the fair market value of a share of Common Stock on either the first day or the last day of that offering period. The purchase of shares is funded by means of periodic payroll deductions, which may not exceed 15.0% of the employee’s eligible compensation, as defined in the Plan. Among other provisions, the Plan limits the number of shares that can be purchased by a participant during any offering period and cumulatively for any calendar year. VI Chip was a privately held, majority-owned subsidiary of Vicor until June 28, 2019, at which date it was merged with and into Vicor, and its separate corporate existence ceased (see Note 18). Until that time, VI Chip could grant stock options under the VI Chip Corporation Amended and Restated 2007 Stock Option and Incentive Plan Picor was a privately held, majority-owned subsidiary of Vicor until May 30, 2018, at which date it was merged with and into Vicor, and its separate corporate existence ceased (see Note 18). Until that time, Picor could grant stock options under the Picor Corporation Amended and Restated 2001 Stock Option and Incentive Plan All time-based (i.e., non-performance-based) non-performance-based) Stock-based compensation expense for the years ended December 31 was as follows (in thousands): 2021 2020 2019 Cost of revenues $ 1,000 $ 934 $ 342 Selling, general and administrative 3,873 3,164 1,979 Research and development 2,162 1,785 715 Total stock-based compensation $ 7,035 $ 5,883 $ 3,036 The increase in stock option compensation expense in 2021 compared to 2020, was primarily due to an increase in the number of stock options granted and higher stock-based compensation expense associated with June 2021 stock option awards. Compensation expense by type of award for the years ended December 31 was as follows (in thousands): 2021 2020 2019 Stock options $ 6,122 $ 4,982 $ 2,072 ESPP 913 901 964 Total stock-based compensation $ 7,035 $ 5,883 $ 3,036 The fair value for non-performance-based 2021 2020 2019 Risk-free interest rate 0.8 % 0.5 % 1.8 % Expected dividend yield — — — Expected volatility 49 % 48 % 42 % Expected lives (years) 4.9 6.1 6.3 Risk-free interest rate: The Company uses the yield on zero-coupon Expected dividend yield: The Company determines the expected dividend yield by annualizing the most recent prior cash dividends declared by the Company’s Board of Directors, if any, and dividing that result by the closing stock price on the date of that dividend declaration. Dividends are not paid on options. Expected volatility: Vicor uses historical volatility to estimate the grant-date fair value of the options, using the expected term for the period over which to calculate the volatility (see below). The Company does not expect its future volatility to differ from its historical volatility. The computation of the Company’s volatility is based on a simple average calculation of monthly volatilities over the expected term. Expected term: The Company uses historical employee exercise and option expiration data to estimate the expected term assumption for the Black-Scholes grant-date valuation. The Company believes this historical data is currently the best estimate of the expected term of options, and all groups of the Company’s employees exhibit similar exercise behavior. Forfeiture rate: The amount of stock-based compensation recognized during a period is based on the value of the portion of the awards that are ultimately expected to vest. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The term “forfeitures” is distinct from “cancellations” or “expirations” and represents only the unvested portion of the surrendered option. The forfeiture analysis is re-evaluated Based on an analysis of historical forfeitures, the Company applied an annual forfeiture rate of 4.85% in 2021, estimating approximately 86% of its options would actually vest. For 2020 and 2019, the Company applied an annual forfeiture rate of 5.25%, estimating approximately 85% of its options would actually vest in those two years. A summary of the activity under the 2000 Plan as of December 31, 2021 and changes during the year then ended, is presented below (in thousands except for share and weighted-average data): Options Weighted- Weighted- Aggregate Outstanding on December 31, 2020 2,023,477 $ 20.98 Granted 267,559 $ 93.40 Forfeited and expired (61,924 ) $ 58.95 Exercised (551,451 ) $ 13.81 Outstanding on December 31, 2021 1,677,661 $ 33.48 4.56 $ 157,309 Exercisable on December 31, 2021 776,559 $ 11.63 2.93 $ 89,576 Vested or expected to vest as of December 31, 2021(1) 1,617,003 $ 32.10 4.46 $ 153,817 (1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. The number of options expected to vest is calculated by applying an estimated forfeiture rate to the unvested options. As of December 31, 2020 and 2019, the Company had options exercisable for 924,964 and 1,475,947 shares respectively, for which the weighted average exercise prices were $9.05 and $8.74, respectively. During the years ended December 31, 2021, 2020, and 2019, the total intrinsic value of Vicor options exercised (i.e., the difference between the market price at exercise and the price paid by the employee to exercise the options) was approximately $56,933,000, $50,410,000, and $6,636,000, respectively. The total amount of cash received by the Company from options exercised in 2021, 2020, and 2019, was $7,616,000, $9,127,000, and $2,437,000, respectively. The total grant-date fair value of stock options granted during the years ended December 31, 2021, 2020, and 2019 was approximately $10,506,000, $10,847,000, and $1,657,000, respectively. As of December 31, 2021, there was approximately $15,019,000 of total unrecognized compensation cost related to unvested non-performance The weighted-average fair value of Vicor options granted was $39.27, $30.63, and $14.30, in 2021, 2020, and 2019, respectively. 401(k) Plan The Company sponsors a savings plan available to all domestic employees, which qualifies under Section 401(k) of the Code. Employees may contribute to the plan in amounts representing from 1% to 80% of their pre-tax Stock Bonus Plan Under the Company’s 1985 Stock Bonus Plan, as amended, shares of Common Stock may be awarded to employees from time to time as determined by the Board of Directors. On December 31, 2021, 109,964 shares were available for further award. All shares awarded to employees under this plan have vested. No further awards are contemplated under this plan at the present time.

Leases

Leases	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Leases	12. LEASES Substantially 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 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 December 31, 2021, the balance of right of use (“ ROU The maturities of the Company’s lease liabilities are as follows (in thousands): 2022 $ 1,668 2023 1,194 2024 973 2025 536 2026 700 Total lease payments $ 5,071 Less: Imputed interest 295 Present value of lease liabilities $ 4,776 As of December 31, 2021, the weighted-average remaining lease term was 4.1 years and the weighted-average discount rate was 2.97% 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 years ended December 31, 2021 and December 31, 2020, the Company paid approximately $1,876,000 and $1,930,000, respectively, for amounts included in the measurement of lease liabilities through operating cash flows. The Company obtained approximately $2,267,000 and $2,029,000 in ROU assets in exchange for $2,256,000 and $1,935,000 of new operating lease liabilities for the years ended December 31, 2021 and December 31, 2020, respectively. The maturities of the lease payments to be received by the Company under the lease agreement for its leased facility in California are as follows (in thousands): 2022 $ 928 2023 955 2024 402 Total lease payments to be received $ 2,285 The Company recorded net lease income under this lease of approximately $792,000 for each of the years ended December 31, 2021, 2020 and 2019.

Other Income (Expense), Net

Other Income (Expense), Net	12 Months Ended
	Dec. 31, 2021
Other Income and Expenses [Abstract]
Other Income (Expense), Net	13. OTHER INCOME (EXPENSE), NET The components of Other income (expense), net for the years ended December 31 were as follows (in thousands): 2021 2020 2019 Interest income $ 930 $ 95 $ 300 Rental income, net 792 792 792 (Loss) gain on disposal of equipment (72 ) 13 38 Foreign currency (losses) gains, net (336 ) 181 (108 ) Other (111 ) 12 44 $ 1,203 $ 1,093 $ 1,066

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	14. INCOME TAXES The tax provision includes estimated federal, state and foreign income taxes on the Company’s pre-tax The reconciliation of the federal statutory rate on the income before income taxes to the effective income tax rate for the years ended December 31 is as follows: 2021 2020 2019 Statutory federal tax rate 21.0 % 21.0 % 21.0 % State income taxes, net of federal income tax benefit (4.2 ) (0.5 ) (8.1 ) Increase in valuation allowance 9.2 41.2 2.2 Permanent items (17.9 ) (48.7 ) (3.9 ) Tax credits (5.7 ) (11.2 ) (15.6 ) Provision vs. tax return differences (2.0 ) 0.7 9.0 Foreign rate differential and deferred items — 0.1 0.6 Other (0.1 ) 0.3 — 0.3 % 2.9 % 5.2 % In 2021 and 2020, the Company was in a taxable loss position which generated net operating loss carryforwards, primarily due to tax deductions on exercises of stock-based compensation of approximately $55,300,000 and $49,500,000, respectively. In 2019, the Company utilized net operating loss carryforwards and tax credits to offset federal income tax expense. For financial reporting purposes, income before income taxes for the years ended December 31 include the following components (in thousands): 2021 2020 2019 Domestic $ 56,620 $ 17,688 $ 13,493 Foreign 185 773 1,394 $ 56,805 $ 18,461 $ 14,887 Significant components of the provision (benefit) for income taxes for the years ended December 31 are as follows (in thousands): 2021 2020 2019 Current: Federal $ 1 $ 215 $ — State (14 ) 93 268 Foreign 171 252 450 158 560 718 Deferred: Foreign 18 (21 ) 60 18 (21 ) 60 $ 176 $ 539 $ 778 Significant components of the Company’s deferred tax assets and liabilities as of December 31 were as follows (in thousands): 2021 2020 Deferred tax assets: Research and development tax credit carryforwards $ 36,041 $ 29,046 Net operating loss carryforwards 5,985 5,923 Stock-based compensation 2,341 1,796 Inventory reserves 2,268 2,282 Investment tax credit carryforwards 1,928 1,927 UNICAP 1,363 1,336 Vacation accrual 1,338 1,349 Lease liabilities 787 518 Accrued payroll tax deferral 384 764 Other 1,568 1,197 Total deferred tax assets 54,003 46,138 Less: Valuation allowance for deferred tax assets (43,329 ) (37,856 ) Net deferred tax assets 10,674 8,282 Deferred tax liabilities: Depreciation (9,048 ) (6,809 ) ROU assets (756 ) (490 ) Prepaid expenses (662 ) (616 ) Other — (141 ) Total deferred tax liabilities (10,466 ) (8,056 ) Net deferred tax assets (liabilities) $ 208 $ 226 As of December 31, 2021, the Company has a valuation allowance of approximately $43,329,000 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, as a result of increases in bookings, the Company is in a cumulative loss position as of December 31, 2021, primarily due to tax deductions on 2020 and 2021 exercises of stock-based compensation. The Company faces uncertainties in forecasting its operating results due to vendor 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, at this time, 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 December 31, 2021. 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 and increases in bookings continue, and the Company’s concerns about industry uncertainty and world events, supply and 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. Certain state tax credits, though, will likely never be released by the valuation allowance. 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. The state and federal research and development tax credit carryforwards of approximately $13,970,000 and $24,807,000, respectively, expire beginning in 2021 for state purposes and in 2025 for federal purposes. The Company has federal net operating loss carryforwards generated after 2017 of approximately $25,963,000, which have an indefinite carryforward period and certain state operating loss carryforwards of approximately $24,804,000, which expire beginning in 2025. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): 2021 2020 2019 Balance on January 1 $ 2,297 $ 2,070 $ 1,462 Additions based on tax positions related to the current year 625 244 571 Additions (reductions) for tax positions of prior years 393 (13 ) 43 Lapse of statute (69 ) (4 ) (6 ) Balance on December 31 $ 3,246 $ 2,297 $ 2,070 The Company has reviewed the tax positions taken, or to be taken, in its tax returns for all tax years currently open to examination by a taxing authority. The total amount of unrecognized tax benefits, that is the aggregate tax effect of differences between tax return positions and the benefits recognized in the Company’s financial statements, as of December 31, 2021, 2020, and 2019 of $3,246,000, $2,297,000, and $2,070,000, respectively, if recognized, may decrease the Company’s income tax provision and effective tax rate. None of the unrecognized tax benefits as of December 31, 2021 are expected to significantly change during the next twelve months. The Company recognizes accrued interest and penalties, if any, related to unrecognized tax benefits as a component of income tax expense. During the years ended December 31, 2021, 2020, and 2019, the Company recognized approximately $19,000, $17,000, and $7,000, respectively, in net interest expense. As of December 31, 2021 and 2020, the Company had accrued approximately $52,000 and $58,000, respectively, for the potential payment of interest. The Company files income tax returns in the United States and various foreign tax jurisdictions. These tax returns are generally open to examination by the relevant tax authorities from three to seven years from the date they are filed. The tax filings relating to the Company’s federal and state taxes are currently open to examination for tax years 2018 through 2020 and 2012 through 2020, respectively. In addition, the Company generated federal research and development credits in tax years 2005 through 2017. These years may also be subject to examination when the credits are carried forward and utilized in future years. 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 examination is in its early stages. There are no other audits or examinations in process in any other jurisdiction.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	15. COMMITMENTS AND CONTINGENCIES As of December 31, 2021, we had a total of approximately $32,949,000 of capital expenditure commitments, principally for manufacturing and production equipment, which we intend to fund with existing cash, and approximately $4,803,000 of capital expenditure items which had been received and included in Property, plant and equipment in the accompanying 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 “Texas Action”). The complaint, as amended, 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, and has asserted that the SynQor patents are invalid and/or unenforceable. The Company has also asserted counterclaims seeking damages from 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 November 24, 2015, the District Court ordered the Texas Action stayed pending completion of certain inter partes reexamination (“IPRx”) proceedings initiated by the Company at the United States Patent and Trademark Office (“USPTO”). In these IPRx proceedings, the Company challenged the validity of the SynQor patent claims asserted in the Texas Action. On November 16, 2021 the District Court issued an order lifting the stay. At a hearing on February 2, 2022, the District Court issued an order denying all pending summary judgment and other pre-trial non-infringement The current status of the IPRx proceedings is as follows: • 190 patent: Certain claims of the ‘190 patent were found unpatentable by the Federal Circuit Court of Appeals (“Federal Circuit”) in a decision issued on March 13, 2015. The court remanded the remaining claims to the USPTO for further consideration. On February 20, 2019, the Patent Trial and Appeal Board (“PTAB”) of the USPTO issued a decision finding that all of the remaining challenged claims were unpatentable. SynQor appealed that decision. On February 22, 2021, the Federal Circuit issued a decision in that appeal. In a 2-1 • ‘021 patent: On August 30, 2017, the Federal Circuit issued a final decision finding all of the asserted claims of the ‘021 patent unpatentable. • ‘702 patent: On August 30, 2017, the Federal Circuit issued a final decision finding all of the asserted claims of the ‘702 patent to be patentable. • ‘290 patent: On June 16, 2021, the PTAB issued a decision finding all of the claims of the ‘290 patent unpatentable. SynQor has filed an appeal of that decision to the Federal Circuit, where it remains pending. On January 23, 2018, the 20-year 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 or reasonably possible 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.

VI Chip Mergers

VI Chip Mergers	12 Months Ended
	Dec. 31, 2021
Business Combinations [Abstract]
VI Chip Mergers	16. VI CHIP MERGER On June 28, 2019, the Company’s Board of Directors unanimously approved the merger of VI Chip, a subsidiary of Vicor that was fully consolidated for financial reporting purposes, with and into the Company. The merger was completed as of June 28, 2019, at which time the separate corporate existence of VI Chip ceased. To effect the merger, holders of VI Chip common stock and VI Chip stock options received an equivalent value of Vicor Common Stock and Vicor stock options, respectively, pursuant (with respect to the stock options) to the assumption of the 2007 VI Chip Plan, and options outstanding thereunder, by the Company. There was no net impact on the Company’s consolidated financial statements for the year ended December 31, 2019 as a result of the merger.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2021
Segment Reporting [Abstract]
Segment Information	17. SEGMENT INFORMATION In the second quarter of 2019, management determined, with the approval of the Company’s Board of Directors and Chief Operating Decision Maker (“CODM”), Dr. Vinciarelli, the Company would report as one segment, rather than under the three segment approach previously employed since 2007. The Company’s strategy had evolved with a transition in organizational focus, emphasizing investment in Advanced Products, targeting high growth market segments with a low-mix, high-mix, low-volume product groupings, which constitute one segment. Both product lines are built in the Company’s manufacturing facility in Andover, Massachusetts employing similar processing and production techniques, and are supported by the same sales and marketing organizations. As such, the Company has conformed the segment reporting to the new reporting structure utilized by the CODM. Accordingly, three-segment information for prior periods has not been presented, to conform with the new presentation.​​​​​​​

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Principles of consolidation	Principles of consolidation The Consolidated Financial Statements include the accounts of the Company and its subsidiaries. All intercompany transactions and balances have been eliminated upon consolidation.
Use of estimates	Use of estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingencies at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Such estimates and assumptions relate to the useful lives of fixed assets and identified intangible assets, recoverability of long-lived assets, fair value of short-term and long-term investments, allowances for doubtful accounts, potential excess, obsolete or unmarketable inventory, potential reserves relating to litigation matters, accrued liabilities, accrued taxes, deferred tax valuation allowances, assumptions pertaining to share-based payments, and other reserves. Actual results could differ from those based on these estimates and assumptions, and such differences may be material to the financial statements.
Foreign currency translation	Foreign currency translation The financial statements of Vicor Japan Company, Ltd. (“VJCL”), a majority-owned subsidiary, for which the functional currency is the Japanese Yen, have been translated into U.S. Dollars using the exchange rate in effect at the balance sheet date for balance sheet amounts and the average exchange rates in effect during the year for income statement amounts. The gains and losses resulting from the changes in exchange rates from year to year have been reported in other comprehensive income. Transaction gains and losses resulting from the remeasurement of foreign currency denominated assets and liabilities of the Company’s foreign subsidiaries where the functional currency is the U.S. Dollar are included in other income (expense), net. Foreign currency (losses) gains included in other income (expense), net, w e
Investments	Investments The Company’s principal sources of liquidity are its existing balances of cash and cash equivalents and short-term investments, as well as cash generated from operations. Consistent with the guidelines of the Company’s investment policy, the Company can invest, and has historically invested, its cash balances in demand deposit accounts, money market funds, government debt securities, and auction rate securities meeting certain quality criteria.
Cash and cash equivalents	Cash and Cash Equivalents Cash and cash equivalents are highly liquid investments with insignificant interest rate risk and maturities of 90 days or less at the time of acquisition. Cash and cash equivalents include funds held in disbursement (i.e., checking) and money market accounts, certificates of deposit, and debt securities with maturities of less than three months at the time of purchase. Cash and cash equivalents are valued at cost, approximating market value. The Company’s money market securities are purchased and redeemed at par value. Their estimated fair value is equal to their cost, and, due to the nature of the securities and their classification as cash equivalents, there are no unrealized gains or losses recorded at the balance sheet dates.
Short-term Investments	Short-term Investments The Company’s short-term investments, consisting of obligations of the U.S. Treasury, are debt securities with original maturities greater than three months but less than one year at the time of purchase.
Long-term investments	Long-term Investment The Company’s long-term investment is an auction rate debt security with a maturity of greater than one year and is subject to credit, liquidity, market, and interest rate risk.
Available-For-Sale Securities	Available-For-Sale Certain of the cash and cash equivalents, all of the short-term investments and the long-term investment are classified as available-for-sale non-credit The Company periodically evaluates the long-term investment to determine if impairment is required, whether an impairment is other than temporary, and the measurement of an impairment loss. The Company considers a variety of impairment indicators such as, but not limited to, a significant deterioration in the earnings performance, credit rating, or asset quality of the investment. The amortized cost of the debt securities are adjusted for amortization of premiums and accretion of discounts to maturity, the net amount of which, along with interest and realized gains and losses, is included in “Other income (expense), net” in the Consolidated Statements of Operations.
Fair value measurements	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 that 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: Level 1 Inputs used to measure fair value are unadjusted quoted prices available in active markets for the identical assets or liabilities as of the reporting date. Level 2 Inputs used to measure fair value, other than quoted prices included in Level 1, are either directly or indirectly observable as of the reporting date through correlation with market data, including quoted prices for similar assets and liabilities in active markets and quoted prices in inactive markets. Level 2 also includes assets and liabilities valued using models or other pricing methodologies that do not require significant judgment since the input assumptions used in the models, such as interest rates and volatility factors, are corroborated by readily observable data from actively quoted markets for substantially the full term of the financial instrument. Level 3 Inputs used to measure fair value are unobservable inputs supported by little or no market activity and reflect the use of significant management judgment. These values are generally determined using pricing models for which the assumptions utilize management’s estimates of market participant assumptions. The carrying amounts of cash and cash equivalents, short-term investments, accounts receivable, and accounts payable approximate fair value because of the short maturities of these financial instruments.
Inventories	Inventories Inventories are valued at the lower of cost (determined using the first-in, first-out Inventory estimated to be excess, obsolete, or unmarketable is written down to net realizable value. The Company’s estimation process for assessing net realizable value is based upon management’s estimate of expected future utility which is derived based on backlog, historical consumption and expected market conditions. If the Company’s estimated demand and/or market expectations 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.
Concentrations of risk	Concentrations of risk Financial instruments potentially subjecting the Company to significant concentrations of credit risk consist principally of cash and cash equivalents and short-term investments, of which a significant portion are held by three financial institutions, its long-term investment, and trade accounts receivable. The Company maintains cash and cash equivalents, short-term investments and certain other financial instruments with high credit counterparties, and continuously monitors the amount of credit exposure to any one issuer and diversifies its investments in order to minimize its credit risk. Generally, amounts invested with these financial institutions are in excess of federal deposit insurance limits. The Company has not experienced any losses in such accounts, and management believes the Company is not exposed to significant credit risk. The Company’s long-term investment as of December 31, 2021 consists of a single auction rate security with a par value of $3,000,000, which is collateralized by student loans. It is a highly rated (Aaa/AA+) municipal and corporate debt security. Through December 31, 2021, auctions held for the Company’s auction rate security have failed. The funds associated with an auction rate security that has failed auction may not be accessible until a successful auction occurs, a buyer is found outside of the auction process, the security is called, or the underlying securities have matured. If the credit rating of the issuer of the auction rate security held deteriorates, the Company may be required to adjust the carrying value of the investment for an other-than-temporary decline in value through an impairment charge. The Company’s investment policy, approved by the Board of Directors, limits the amount the Company may invest in any issuer, thereby reducing credit risk concentrations. The Company’s products are sold worldwide to customers ranging from smaller, independent manufacturers of highly specialized electronic devices, to larger OEMs, ODMs and their contract manufacturers. See Note 17, Segment Information Components and materials used in the Company’s products are purchased from a variety of vendors. While most of the components are available from multiple sources, some key components for certain Advanced Products, in particular, are supplied by single vendors. In instances of single source items, the Company maintains levels of inventories management considers appropriate to enable meeting the delivery requirements of customers. If suppliers or subcontractors cannot provide their products or services on time or to the required specifications, the Company may not be able to meet the demand for its products and its delivery times may be negatively affected.
Long-lived assets	Long-lived assets The Company reviews property, plant and equipment and finite-lived intangible assets for impairment whenever events or changes in circumstances indicate the carrying value of such assets may not be recoverable. Management determines whether the carrying value of an asset or asset group is recoverable based on comparison to the undiscounted expected future cash flows the assets are expected to generate over their remaining economic lives. If an asset value is not recoverable, the impairment loss is equal to the amount by which the carrying value of the asset exceeds its fair value, which is determined by either a quoted market price, if any, or a value determined by utilizing a discounted cash flow technique. Evaluation of impairment of long-lived assets requires estimates of future operating results that are used in the preparation of the expected future undiscounted cash flows. Actual future operating results and the remaining economic lives of our long-lived assets could differ from the estimates used in assessing the recoverability of these assets. These differences could result in impairment charges, which could be material.
Intangible assets	Intangible assets Values assigned to patents are amortized using the straight-line method over periods ranging from three to 20 years. Patents and other intangible assets are included in “Other assets” in the accompanying Consolidated Balance Sheets.
Product warranties	Product warranties The Company generally offers a two-year
Revenue recognition	Revenue recognition Revenue is recognized when control of the promised goods or services is transferred to a customer, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. Sales, value add, and other taxes collected concurrent with revenue producing activities are excluded from revenue. The expected costs associated with product warranties continue to be recognized at the time product revenue is recognized. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are included in cost of revenues. The Company’s primary source of net revenue comes from the sale of products, which are modular power components and power systems for converting, regulating and controlling electric current. The principal customers for the Company’s power converters and systems are large OEMs, ODMs and the original design manufacturers and contract manufacturers serving them, and smaller, lower volume users, which are broadly distributed across several major market areas. The Company recognizes revenue for product sales at a point in time following the transfer of control of such products to the customer, including sales to stocking distributors, which typically occurs upon shipment or delivery, depending on the terms of the underlying contract. The Company establishes sales allowances on shipments to stocking distributors for estimated future product returns including distributor returns and price adjustment credits, primarily based upon historical and anticipated rates of product returns and allowances. Certain contracts with customers contain multiple performance obligations, which typically may include a combination of non-recurring The Company licenses its intellectual property under right to use licenses, in which royalties due to the Company are based upon a percentage of the licensee’s sales. The Company utilizes the exception under the revenue recognition guidance for the recognition of sales- or usage-based royalties, in which the royalties are not recognized until the later of when 1) the customer’s subsequent sales or usages occur, or 2) the performance obligation to which some or all of the sales- or usage-based royalty has been allocated is satisfied or partially satisfied. Accounts receivable includes amounts billed and currently due from customers. The amounts due are stated at their estimated realizable value. The Company’s payment terms vary by the type and location of its customers and the products or services offered, although terms generally include a requirement of payment within 30 to 60 days. The Company maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments, based on assessments of customers’ credit-risk profiles and payment histories. If the financial condition of the Company’s customers were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required. The Company does not require collateral from its customers, although there have been circumstances when the Company has required cash in advance (i.e., a partial down-payment) to facilitate orders in excess of a customer’s established credit limit. To date, such amounts have not been material. The Company records deferred revenue, which represents a contract liability, when cash payments are received or due in advance of performance under a contract with a customer. During the years ended December 31, 2021 and 2020, the Company recognized revenue of approximately $4,087,000 and $3,550,000, respectively, that was included in deferred revenue at the beginning of the respective period. The Company applies the practical expedient for the incremental costs of obtaining a contract for sales commissions, which are expensed when incurred because the amortization period is generally less than one year. These costs are included in selling, general and administrative expenses. The Company also applies another practical expedient and does not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.
Advertising expense	Advertising expense The cost of advertising is expensed as incurred. The Company incurred approximately $2,994,000, $2,637,000, and $2,749,000 in advertising costs during 2021, 2020, and 2019, respectively.
Legal Costs	Legal Costs Legal costs in connection with litigation are expensed as incurred.
Stock-based compensation	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. For stock options with time-based vesting provisions, the calculated compensation expense, net of expected forfeitures, is recognized on a straight-line basis over the service period of the award, which is generally five years for stock options. For stock options with performance-based vesting provisions, recognition of compensation expense, net of expected forfeitures, commences if and when the achievement of the performance criteria is deemed probable. For stock options with performance-based vesting provisions, compensation expense, net of expected forfeitures, when recognized, is recognized over the relevant performance period.
Income taxes	Income taxes Deferred tax assets and liabilities are determined based on the differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted income tax rates and laws expected to be in effect when the temporary differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance if management determines it is more likely than not that some portion or all of the deferred tax assets will not be realized. All deferred tax assets and liabilities are classified as noncurrent. The Company follows a two-step “more-likely-than-not” “more-likely-than-not”
Net income (loss) per common share	Net income per common share The Company computes basic net income per share using the weighted average number of common shares outstanding and diluted net income per share using the weighted average number of common shares outstanding plus the effect of outstanding dilutive stock options, if any. The following table sets forth the computation of basic and diluted net income per share for the years ended December 31 (in thousands, except per share amounts): 2021 2020 2019 Numerator: Net income attributable to Vicor Corporation $ 56,625 $ 17,910 $ 14,098 Denominator: Denominator for basic net income per share- weighted average shares (1) 43,651 42,186 40,330 Effect of dilutive securities: Employee stock options (2) 1,315 1,683 1,347 Denominator for diluted net income per share- adjusted weighted-average shares and assumed conversions (3) 44,966 43,869 41,677 Basic net income per share $ 1.30 $ 0.42 $ 0.35 Diluted net income per share $ 1.26 $ 0.41 $ 0.34 (1) Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding. (2) Options to purchase 60,736, 181,196 and 164,367 shares of Common Stock in 2021, 2020, and 2019, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive. (3) Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding for the year, adjusted to include the dilutive effect, if any, of outstand i
Comprehensive income (loss)	Comprehensive income (loss) The components of comprehensive income (loss) include, in addition to consolidated net income (loss), unrealized gains and losses on investments, net of tax and foreign currency translation adjustments related to VJCL, net of tax.
Impact of recently issued accounting standards	Impact of recently issued accounting standards In December 2019, the FASB issued guidance designed to simplify the accounting for income taxes by eliminating certain exceptions to the general principles in Topic 740, Income Taxes Other new pronouncements issued but not effective until after December 31, 2021 are not expected to have a material impact on the Company’s consolidated financial statements.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
Revenue, Major Customer [Line Items]
Computation Of Basic And Diluted Net Income (Loss) Per Share	The following table sets forth the computation of basic and diluted net income per share for the years ended December 31 (in thousands, except per share amounts): 2021 2020 2019 Numerator: Net income attributable to Vicor Corporation $ 56,625 $ 17,910 $ 14,098 Denominator: Denominator for basic net income per share- weighted average shares (1) 43,651 42,186 40,330 Effect of dilutive securities: Employee stock options (2) 1,315 1,683 1,347 Denominator for diluted net income per share- adjusted weighted-average shares and assumed conversions (3) 44,966 43,869 41,677 Basic net income per share $ 1.30 $ 0.42 $ 0.35 Diluted net income per share $ 1.26 $ 0.41 $ 0.34 (1) Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding. (2) Options to purchase 60,736, 181,196 and 164,367 shares of Common Stock in 2021, 2020, and 2019, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive. (3) Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding for the year, adjusted to include the dilutive effect, if any, of outstand i

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2021
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories as of December 31 were as follows (in thousands): 2021 2020 Raw materials $ 51,289 $ 42,556 Work-in-process 12,514 7,424 Finished goods 3,519 7,289 $ 67,322 $ 57,269

Short-Term and Long-Term Inve_2

Short-Term and Long-Term Investments (Tables)	12 Months Ended
	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Summary of Investment	Details of our investments are as follows (in thousands): December 31, 2021 Cash and Short-Term Long-Term Measured at fair value: Available-for-sale Money Market Funds $ 94,282 $ — $ — U.S. Treasury Obligations — 45,215 — Failed Auction Security — — 2,639 Total 94,282 45,215 2,639 Other measurement basis: Cash on hand 88,136 — — Total $ 182,418 $ 45,215 $ 2,639 December 31, 2020 Cash and Short-Term Long-Term Measured at fair value: Available-for-sale Money Market Funds $ 69,493 $ — $ — U.S. Treasury Obligations 19,998 50,166 — Failed Auction Security — — 2,517 Total 89,491 50,166 2,517 Other measurement basis: Cash on hand 72,251 — — Total $ 161,742 $ 50,166 $ 2,517
Summary of Available-for-Sale Securities	The following is a summary of the available-for-sale December 31, 2021 Cost Gross Gross Estimated U.S. Treasury Obligations $ 45,238 $ — $ 23 $ 45,215 Failed Auction Security 3,000 — 361 2,639 December 31, 2020 U.S. Treasury Obligations $ 70,172 $ — $ 8 $ 70,164 Failed Auction Security 3,000 — 483 2,517
Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturities	The amortized cost and estimated fair value of the available-for-sale U.S. Treasury Obligations: Cost Estimated Fair Maturities greater than three months but less than one year $ 45,238 $ 45,215 Failed Auction Security: Cost Estimated Fair Due in twenty to forty years $ 3,000 $ 2,639

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2021
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 December 31, 2021 (in thousands): Using Quoted Prices Significant Significant Total Fair Cash equivalents: Money market funds $ 94,282 $ — $ — $ 94,282 Short-term investments: U.S. Treasury Obligations 45,215 — — 45,215 Long-term investments: Failed Auction Security — — 2,639 2,639 Assets measured at fair value on a recurring basis included the following as of December 31, 2020 (in thousands): Using Quoted Prices Significant Significant Total Fair Cash equivalents: Money market funds $ 69,493 $ — $ — $ 69,493 U.S. Treasury Obligations 19,998 — — 19,998 Short-term investments: U.S. Treasury Obligations 50,166 — — 50,166 Long-term investments: Failed Auction Security — — 2,517 2,517 Liabilities: Contingent consideration obligations — — (227 ) (227 )
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 year ended December 31, 2021 was as follows (in thousands): Balance at the beginning of the period $ 2,517 Credit gain on available-for-sale 4 Gain included in Other comprehensive income 118 Balance at the end of the period $ 2,639

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment as of December 31 were as follows (in thousands): 2021 2020 Land $ 3,600 $ 3,600 Buildings and improvements 50,138 45,905 Machinery and equipment 247,926 233,635 Furniture and fixtures 9,825 8,429 Construction in-progress 48,088 17,987 359,577 309,556 Accumulated depreciation and amortization (248,226 ) (239,162 ) Right of use asset — net 4,624 4,449 Net balance $ 115,975 $ 74,843

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Patents [Member]
Schedule of Patent Cost and Other Asset	Patent costs, which are included in Other assets in the accompanying Consolidated Balance Sheets, as of December 31 were as follows (in thousands): 2021 2020 Patent costs $ 1,686 $ 1,859 Accumulated amortization (1,354 ) (1,434 ) $ 332 $ 425

Product Warranties (Tables)

Product Warranties (Tables)	12 Months Ended
	Dec. 31, 2021
Guarantees and Product Warranties [Abstract]
Product Warranty Activity	Product warranty activity for the years ended December 31 was as follows (in thousands): 2021 2020 2019 Balance at the beginning of the period $ 308 $ 372 $ 268 Accruals for warranties for products sold in the period 158 366 250 Fulfillment of warranty obligations (151 ) (398 ) (140 ) Revisions of estimated obligations (23 ) (32 ) (6 ) Balance at the end of the period $ 292 $ 308 $ 372

Revenues (Tables)

Revenues (Tables)	12 Months Ended
	Dec. 31, 2021
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): Year Ended December 31, 2021 Brick Advanced Total United States $ 74,280 $ 44,360 $ 118,640 Europe 32,762 5,145 37,907 Asia Pacific 80,344 120,459 200,803 All other 1,758 256 2,014 $ 189,144 $ 170,220 $ 359,364 Year Ended December 31, 2020 Brick Advanced Total United States $ 80,065 $ 25,493 $ 105,558 Europe 23,491 6,641 30,132 Asia Pacific 83,985 73,899 157,884 All other 2,715 287 3,002 $ 190,256 $ 106,320 $ 296,576 Year Ended December 31, 2019 Brick Advanced Total United States $ 98,822 $ 22,806 $ 121,628 Europe 22,172 5,090 27,262 Asia Pacific 62,720 46,107 108,827 All other 4,182 1,078 5,260 $ 187,896 $ 75,081 $ 262,977
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): Year Ended December 31, 2021 Brick Advanced Total Direct customers, contract manufacturers and non-stocking $ 139,099 $ 144,180 $ 283,279 Stocking distributors, net of sales allowances 49,359 14,123 63,482 Non-recurring 686 10,027 10,713 Royalties — 1,819 1,819 Other — 71 71 $ 189,144 $ 170,220 $ 359,364 Year Ended December 31, 2020 Brick Advanced Total Direct customers, contract manufacturers and non-stocking $ 160,004 $ 91,405 $ 251,409 Stocking distributors, net of sales allowances 29,411 8,510 37,921 Non-recurring 841 6,181 7,022 Royalties — 152 152 Other — 72 72 $ 190,256 $ 106,320 $ 296,576 Year Ended December 31, 2019 Brick Advanced Total Direct customers, contract manufacturers and non-stocking $ 159,135 $ 63,567 $ 222,702 Stocking distributors, net of sales allowances 27,797 9,802 37,599 Non-recurring 843 1,614 2,457 Royalties 121 24 145 Other — 74 74 $ 187,896 $ 75,081 $ 262,977
Summary of Changes in Contract Assets And Liabilities	The following table presents the changes in certain contract assets and (liabilities) (in thousands): December 31, December 31, Change Short-term deferred revenue and customer prepayments $ (7,912 ) $ (7,309 ) $ (603 ) Long-term deferred revenue (413 ) (733 ) 320 Deferred expenses 560 1,650 (1,090 ) Sales allowances (1,464 ) (597 ) (867 )
Schedule of Net Revenues from Unaffiliated Customers by Geographic Region Based on the Location of the Customer	Net revenues from unaffiliated customers by geographic region, based on the location of the customer, for the years ended December 31 were as follows (in thousands): 2021 2020 2019 United States $ 118,640 $ 105,558 $ 121,628 Europe 37,907 30,132 27,262 Asia Pacific 200,803 157,884 108,827 All other 2,014 3,002 5,260 $ 359,364 $ 296,576 $ 262,977

Stock-Based Compensation and _2

Stock-Based Compensation and Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Stock-Based Compensation Expense	Stock-based compensation expense for the years ended December 31 was as follows (in thousands): 2021 2020 2019 Cost of revenues $ 1,000 $ 934 $ 342 Selling, general and administrative 3,873 3,164 1,979 Research and development 2,162 1,785 715 Total stock-based compensation $ 7,035 $ 5,883 $ 3,036
Summary of Compensation Expense by Type of Award	The increase in stock option compensation expense in 2021 compared to 2020, was primarily due to an increase in the number of stock options granted and higher stock-based compensation expense associated with June 2021 stock option awards. Compensation expense by type of award for the years ended December 31 was as follows (in thousands): 2021 2020 2019 Stock options $ 6,122 $ 4,982 $ 2,072 ESPP 913 901 964 Total stock-based compensation $ 7,035 $ 5,883 $ 3,036
Weighted-Average Assumptions for Non Performance-Based Fair Value for Stock Options	The fair value for non-performance-based 2021 2020 2019 Risk-free interest rate 0.8 % 0.5 % 1.8 % Expected dividend yield — — — Expected volatility 49 % 48 % 42 % Expected lives (years) 4.9 6.1 6.3
2000 Plan, Vicor [Member]
Stock-Based Compensation Expense	A summary of the activity under the 2000 Plan as of December 31, 2021 and changes during the year then ended, is presented below (in thousands except for share and weighted-average data): Options Weighted- Weighted- Aggregate Outstanding on December 31, 2020 2,023,477 $ 20.98 Granted 267,559 $ 93.40 Forfeited and expired (61,924 ) $ 58.95 Exercised (551,451 ) $ 13.81 Outstanding on December 31, 2021 1,677,661 $ 33.48 4.56 $ 157,309 Exercisable on December 31, 2021 776,559 $ 11.63 2.93 $ 89,576 Vested or expected to vest as of December 31, 2021(1) 1,617,003 $ 32.10 4.46 $ 153,817 (1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. The number of options expected to vest is calculated by applying an estimated forfeiture rate to the unvested options.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Leases, Operating [Abstract]
Maturities of Lease Liabilities	The maturities of the Company’s lease liabilities are as follows (in thousands): 2022 $ 1,668 2023 1,194 2024 973 2025 536 2026 700 Total lease payments $ 5,071 Less: Imputed interest 295 Present value of lease liabilities $ 4,776
Maturities of Lease Payments	The maturities of the lease payments to be received by the Company under the lease agreement for its leased facility in California are as follows (in thousands): 2022 $ 928 2023 955 2024 402 Total lease payments to be received $ 2,285

Other Income (Expense), Net (Ta

Other Income (Expense), Net (Tables)	12 Months Ended
	Dec. 31, 2021
Other Income and Expenses [Abstract]
Components of Other Income	The components of Other income (expense), net for the years ended December 31 were as follows (in thousands): 2021 2020 2019 Interest income $ 930 $ 95 $ 300 Rental income, net 792 792 792 (Loss) gain on disposal of equipment (72 ) 13 38 Foreign currency (losses) gains, net (336 ) 181 (108 ) Other (111 ) 12 44 $ 1,203 $ 1,093 $ 1,066

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Schedule of Reconciliation of Federal Statutory Rate on Loss before Income Taxes and before Gain from Sale of Equity Method Investment Rate to Effective Income Tax Rate	The reconciliation of the federal statutory rate on the income before income taxes to the effective income tax rate for the years ended December 31 is as follows: 2021 2020 2019 Statutory federal tax rate 21.0 % 21.0 % 21.0 % State income taxes, net of federal income tax benefit (4.2 ) (0.5 ) (8.1 ) Increase in valuation allowance 9.2 41.2 2.2 Permanent items (17.9 ) (48.7 ) (3.9 ) Tax credits (5.7 ) (11.2 ) (15.6 ) Provision vs. tax return differences (2.0 ) 0.7 9.0 Foreign rate differential and deferred items — 0.1 0.6 Other (0.1 ) 0.3 — 0.3 % 2.9 % 5.2 %
Schedule of Domestic and Foreign Components of Income (Loss) Before Income Taxes and before the Gain from Sale of Equity Method Investment	For financial reporting purposes, income before income taxes for the years ended December 31 include the following components (in thousands): 2021 2020 2019 Domestic $ 56,620 $ 17,688 $ 13,493 Foreign 185 773 1,394 $ 56,805 $ 18,461 $ 14,887
Schedule of Components of Provision (Benefit) for Income Taxes	Significant components of the provision (benefit) for income taxes for the years ended December 31 are as follows (in thousands): 2021 2020 2019 Current: Federal $ 1 $ 215 $ — State (14 ) 93 268 Foreign 171 252 450 158 560 718 Deferred: Foreign 18 (21 ) 60 18 (21 ) 60 $ 176 $ 539 $ 778
Schedule of Significant Components of Deferred Tax Assets and Liabilities	Significant components of the Company’s deferred tax assets and liabilities as of December 31 were as follows (in thousands): 2021 2020 Deferred tax assets: Research and development tax credit carryforwards $ 36,041 $ 29,046 Net operating loss carryforwards 5,985 5,923 Stock-based compensation 2,341 1,796 Inventory reserves 2,268 2,282 Investment tax credit carryforwards 1,928 1,927 UNICAP 1,363 1,336 Vacation accrual 1,338 1,349 Lease liabilities 787 518 Accrued payroll tax deferral 384 764 Other 1,568 1,197 Total deferred tax assets 54,003 46,138 Less: Valuation allowance for deferred tax assets (43,329 ) (37,856 ) Net deferred tax assets 10,674 8,282 Deferred tax liabilities: Depreciation (9,048 ) (6,809 ) ROU assets (756 ) (490 ) Prepaid expenses (662 ) (616 ) Other — (141 ) Total deferred tax liabilities (10,466 ) (8,056 ) Net deferred tax assets (liabilities) $ 208 $ 226
Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): 2021 2020 2019 Balance on January 1 $ 2,297 $ 2,070 $ 1,462 Additions based on tax positions related to the current year 625 244 571 Additions (reductions) for tax positions of prior years 393 (13 ) 43 Lapse of statute (69 ) (4 ) (6 ) Balance on December 31 $ 3,246 $ 2,297 $ 2,070

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021USD ($)Customer	Dec. 31, 2020USD ($)Customer	Dec. 31, 2019USD ($)
Revenue, Major Customer [Line Items]
Foreign currency gains (losses)	$ (336,000)	$ 181,000	$ (108,000)
Maturity period of cash and cash equivalents	less than three months
Available-for-sale securities, failed auction, value	$ 3,000,000
Number of customers accounted for trade account receivable | Customer	1	1
Cost of advertising	$ 2,994,000	$ 2,637,000	$ 2,749,000
Percentage likelihood of tax benefit settlement	50.00%
Accounting Standards Update 2014-09 [Member]
Revenue, Major Customer [Line Items]
Deferred revenue current	$ 4,087,000	$ 3,550,000
Customer One [Member]
Revenue, Major Customer [Line Items]
Percentage of trade account receivable	10.00%	24.10%
Maximum [Member]
Revenue, Major Customer [Line Items]
Estimated useful life of intangible assets	20 years
Customer Payments Period	60 days
Minimum [Member]
Revenue, Major Customer [Line Items]
Customer Payments Period	30 days

Significant Accounting Polici_5

Significant Accounting Policies - Computation Of Basic And Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income attributable to Vicor Corporation		$ 56,625	$ 17,910	$ 14,098
Denominator:
Denominator for basic net income per share- weighted average shares	[1]	43,651	42,186	40,330
Effect of dilutive securities:
Employee stock options	[2]	1,315	1,683	1,347
Denominator for diluted net income per share- adjusted weighted-average shares and assumed conversions	[3]	44,966	43,869	41,677
Basic net income per share		$ 1.30	$ 0.42	$ 0.35
Diluted net income per share		$ 1.26	$ 0.41	$ 0.34
[1]	Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding.
[2]	Options to purchase 60,736, 181,196 and 164,367 shares of Common Stock in 2021, 2020, and 2019, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.
[3]	Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding for the year, adjusted to include the dilutive effect, if any, of outstanding options.

Significant Accounting Polici_6

Significant Accounting Policies - Computation Of Basic And Diluted Net Income (Loss) Per Share (Parenthetical) (Detail) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Options to purchase shares of Common Stock not included in the computation of diluted income (loss) per share	60,736	181,196	164,367

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 51,289	$ 42,556
Work-in-process	12,514	7,424
Finished goods	3,519	7,289
Net balance	$ 67,322	$ 57,269

Short-Term and Long-Term Inve_3

Short-Term and Long-Term Investments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
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
Short Term Investments	$ 45,215,000	$ 50,166,000
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	$ 2,639,000	$ 2,517,000

Short-Term and Long-Term Inve_4

Short-Term and Long-Term Investments - Summary of Investment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	$ 182,418	$ 161,742
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	45,215	50,166
Other Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	2,639	2,517
US Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	45,215	70,164
US Treasury Obligations [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale		50,166
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	2,639	2,517
Auction Rate Securities [Member] | Other Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	2,639	2,517
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	94,282	89,491
Estimate of Fair Value Measurement [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	45,215	50,166
Estimate of Fair Value Measurement [Member] | Other Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	2,639	2,517
Estimate of Fair Value Measurement [Member] | US Treasury Obligations [Member] | Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale		19,998
Estimate of Fair Value Measurement [Member] | US Treasury Obligations [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale		50,166
Estimate of Fair Value Measurement [Member] | Auction Rate Securities [Member] | Other Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	2,639	2,517
Estimate of Fair Value Measurement [Member] | Money Market Funds [Member] | Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	94,282	69,493
Estimate of Fair Value Measurement [Member] | US Treasury Obligations [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	45,215
Portion at Other than Fair Value Measurement [Member] | Cash [Member] | Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale	$ 88,136	$ 72,251

Short-Term and Long-Term Inve_5

Short-Term and Long-Term Investments - Summary of Available-for-Sale Securities (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
US Treasury Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Cost	$ 45,238,000	$ 70,172,000
Gross Unrealized Losses	23,000	8,000
Estimated Fair Value	45,215,000	70,164,000
Failed Auction Security [Member]
Debt Securities, Available-for-sale [Line Items]
Cost	3,000,000	3,000,000
Gross Unrealized Losses	361,000	483,000
Estimated Fair Value	$ 2,639,000	$ 2,517,000

Short-Term and Long-Term Inve_6

Short-Term and Long-Term Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturities (Detail) $ in Thousands	Dec. 31, 2021USD ($)
Failed Auction Security [Member]
Schedule of Available-for-sale Securities [Line Items]
Due in twenty to forty years, Cost	$ 3,000
Due in twenty to forty years, Estimated Fair Value	2,639
US Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Maturities greater than three months but less than one year, Cost	45,238
Maturities greater than three months but less than one year, Estimated Fair Value	$ 45,215

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Short-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	$ 45,215	$ 50,166
Other Long-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	2,639	2,517
Contingent Consideration Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Liabilities, fair value on recurring basis		(227)
Failed Auction Security [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	2,639	2,517
Failed Auction Security [Member] | Other Long-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	2,639	2,517
US Treasury Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	45,215
Estimated Fair Value	45,215	70,164
US Treasury Obligations [Member] | Short-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value		50,166
Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	94,282	69,493
US Treasury Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents		19,998
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | US Treasury Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	45,215
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | US Treasury Obligations [Member] | Short-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value		50,166
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	94,282	69,493
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | US Treasury Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents		19,998
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		(227)
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	$ 2,639	$ 2,517

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	12 Months Ended
	Dec. 31, 2021USD ($)
Fair Value Disclosures [Abstract]
Balance at the beginning of the period	$ 2,517
Credit gain on available-for-sale security included in Other income (expense), net	4
Gain included in Other comprehensive income	118
Balance at the end of the period	$ 2,639

Property, Plant and Equipment -

Property, Plant and Equipment - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 11,609,000	$ 10,950,000	$ 10,226,000
Capital expenditure commitments	$ 32,949,000
Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization period	39 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization period	3 years

Property, Plant and Equipment_2

Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Land	$ 3,600	$ 3,600
Buildings and improvements	50,138	45,905
Machinery and equipment	247,926	233,635
Furniture and fixtures	9,825	8,429
Construction in-progress and deposits	48,088	17,987
Property, plant and equipment, gross, total	359,577	309,556
Accumulated depreciation and amortization	(248,226)	(239,162)
Right of use asset — net	4,624	4,449
Net balance	$ 115,975	$ 74,843

Intangible Assets - Schedule of

Intangible Assets - Schedule of Patent Cost and Other Asset (Detail) - Patents [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Patent costs	$ 1,686	$ 1,859
Accumulated amortization	(1,354)	(1,434)
Finite-lived intangible assets, net	$ 332	$ 425

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 96,000	$ 106,000	$ 108,000

Product Warranties - Product Wa

Product Warranties - Product Warranty Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Guarantees [Abstract]
Balance at the beginning of the period	$ 308	$ 372	$ 268
Accruals for warranties for products sold in the period	158	366	250
Fulfillment of warranty obligations	(151)	(398)	(140)
Revisions of estimated obligations	(23)	(32)	(6)
Balance at the end of the period	$ 292	$ 308	$ 372

Stockholders' Equity - Addition

Stockholders' Equity - Additional information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 30, 2000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock repurchased as per November plan					$ 30,000,000
Stock repurchase program amount available		$ 8,541,000
Stock repurchase		0	0	0
Underwritten Public Offer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares issued during the period	1,769,231
Sale of common stock share net amount of inflows	$ 109,714,000
2000 Plan, Vicor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock reserved for issuance		21,268,027	21,852,334	20,895,747

Revenues - Summary of Net Reven

Revenues - Summary of Net Revenues Disaggregated by Geography (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 359,364	$ 296,576	$ 262,977
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	189,144	190,256	187,896
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	170,220	106,320	75,081
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	118,640	105,558	121,628
United States [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	74,280	80,065	98,822
United States [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	44,360	25,493	22,806
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	37,907	30,132	27,262
Europe [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	32,762	23,491	22,172
Europe [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,145	6,641	5,090
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenue	200,803	157,884	108,827
Asia Pacific [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	80,344	83,985	62,720
Asia Pacific [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	120,459	73,899	46,107
All Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,014	3,002	5,260
All Other [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,758	2,715	4,182
All Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 256	$ 287	$ 1,078

Revenues - Summary of Net Rev_2

Revenues - Summary of Net Revenues Disaggregated by Category (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 359,364	$ 296,576	$ 262,977
Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	189,144	190,256	187,896
Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	170,220	106,320	75,081
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member]
Disaggregation of Revenue [Line Items]
Revenue	283,279	251,409	222,702
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	139,099	160,004	159,135
Direct Customers, Contract Manufacturers and Non-stocking Distributors [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	144,180	91,405	63,567
Stocking distributors, net of sales allowances [Member]
Disaggregation of Revenue [Line Items]
Revenue	63,482	37,921	37,599
Stocking distributors, net of sales allowances [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	49,359	29,411	27,797
Stocking distributors, net of sales allowances [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	14,123	8,510	9,802
Non-recurring engineering [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,713	7,022	2,457
Non-recurring engineering [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	686	841	843
Non-recurring engineering [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	10,027	6,181	1,614
Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,819	152	145
Royalties [Member] | Brick Products [Member]
Disaggregation of Revenue [Line Items]
Revenue			121
Royalties [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,819	152	24
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	71	72	74
Other [Member] | Advanced Products [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 71	$ 72	$ 74

Revenues - Summary of Changes i

Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Short-term deferred revenue and customer prepayments	$ (7,912)	$ (7,309)
Long-term deferred revenue	(413)	(733)
Deferred expenses	560	1,650
Sales allowances	(1,464)	$ (597)
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Short-term deferred revenue and customer prepayments	(603)
Long-term deferred revenue	320
Deferred expenses	(1,090)
Sales allowances	$ (867)

Revenues - Additional Informati

Revenues - Additional Information (Detail) - Customer	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of customers	1	1	1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member]
Percentage of total net revenues	14.90%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer Two [Member]
Percentage of total net revenues		18.50%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer Three [Member]
Percentage of total net revenues			12.70%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | China [Member]
Percentage of total net revenues	27.50%	31.40%	22.10%

Revenues - Schedule of Net Reve

Revenues - Schedule of Net Revenues from Unaffiliated Customers by Geographic Region Based on the Location of the Customer (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue	$ 359,364	$ 296,576	$ 262,977
United States [Member]
Revenue	118,640	105,558	121,628
Europe [Member]
Revenue	37,907	30,132	27,262
Asia Pacific [Member]
Revenue	200,803	157,884	108,827
All Other [Member]
Revenue	$ 2,014	$ 3,002	$ 5,260

Stock-Based Compensation and _3

Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of Option	10 years
Employee's compensation plan	The Company matches employee contributions to the plan at a rate of 50%, up to the first 6% of an employee’s compensation.
Employee contributions	20.00%
Company contribution to the plan	$ 1,593,000	$ 1,031,000	$ 1,001,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees pre-tax salary	1.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees pre-tax salary	80.00%
2000 Plan, Vicor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock reserved for issuance	10,000,000
Non-qualified stock options granted to non-employees	85.00%
Annual forfeiture rate	4.85%	5.25%	5.25%
Share exercisable	776,559	924,964	1,475,947
Weighted average exercise prices	$ 11.63	$ 9.05	$ 8.74
Total Intrinsic value	$ 56,933,000	$ 50,410,000	$ 6,636,000
Options Exercised	7,616,000	9,127,000	2,437,000
Fair value of stock options that vested	10,506,000	$ 10,847,000	$ 1,657,000
Total unrecognized compensation cost	$ 15,019,000
Compensation cost recognized over a weighted-average period	1 year 7 months 6 days
Expected recognized expenses, Year One	$ 6,837,000
Expected recognized expenses, Year Two	4,142,000
Expected recognized expenses, Year Three	2,478,000
Expected recognized expenses, Year Four	1,260,000
Expected recognized expenses, Year Five	$ 302,000
Weighted-average fair value	$ 39.27	$ 30.63	$ 14.30
Stock Bonus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock purchase by non-employees	109,964
2017 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified stock options granted to non-employees	85.00%
Maximum number of shares authorized for issuances	2,000,000
Maximum percentage of payroll deductions on employee's compensation	15.00%
Offering period of employee stock purchase plan	6 months

Stock-Based Compensation and _4

Stock-Based Compensation and Employee Benefit Plans - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 7,035	$ 5,883	$ 3,036
Cost of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	1,000	934	342
Selling, General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	3,873	3,164	1,979
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 2,162	$ 1,785	$ 715

Stock-Based Compensation and _5

Stock-Based Compensation and Employee Benefit Plans - Summary of Compensation Expense by Type of Award (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 7,035	$ 5,883	$ 3,036
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	6,122	4,982	2,072
ESPP [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 913	$ 901	$ 964

Stock-Based Compensation and _6

Stock-Based Compensation and Employee Benefit Plans - Weighted-Average Assumptions for Non Performance-Based Fair Value for Stock Options (Detail) - Non Performance-Based Stock Options [Member] - VI Chip [Member]	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Risk-free interest rate	0.80%	0.50%	1.80%
Expected volatility	49.00%	48.00%	42.00%
Expected lives (years)	4 years 10 months 24 days	6 years 1 month 6 days	6 years 3 months 18 days

Stock-Based Compensation and _7

Stock-Based Compensation and Employee Benefit Plans - Summary of the Activity under the 2000 Plan (Detail) - 2000 Plan, Vicor [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Options Outstanding, Beginning balance	2,023,477
Options Outstanding, Granted	267,559
Options Outstanding, Forfeited and expired	(61,924)
Options Outstanding, Exercised	(551,451)
Options Outstanding, Ending balance	1,677,661
Options Outstanding, Exercisable	776,559	924,964	1,475,947
Options Outstanding, Vested or expected to vest	1,617,003
Weighted Average Exercise Price, Beginning balance	$ 20.98
Weighted Average Exercise Price, Granted	93.40
Weighted Average Exercise Price, Forfeited and expired	58.95
Weighted Average Exercise Price, Exercised	13.81
Weighted Average Exercise Price, Ending balance	33.48
Weighted Average Exercise Price, Exercisable	11.63	$ 9.05	$ 8.74
Weighted Average Exercise Price, Vested or expected to vest	$ 32.10
Weighted-Average Remaining Contractual Life in Years, Outstanding	4 years 6 months 21 days
Weighted-Average Remaining Contractual Life in Years, Exercisable	2 years 11 months 4 days
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest	4 years 5 months 15 days
Aggregate Intrinsic Value, Outstanding	$ 157,309
Aggregate Intrinsic Value, Exercisable	89,576
Aggregate Intrinsic Value, Vested or expected to vest	$ 153,817

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities (Detail) $ in Thousands	Dec. 31, 2021USD ($)
2022	$ 1,668
2023	1,194
2024	973
2025	536
2026	700
Total lease payments	5,071
Less: Imputed interest	295
Present value of lease liabilities	$ 4,776

Leases - Maturities of Lease Pa

Leases - Maturities of Lease Payments (Detail) $ in Thousands	Dec. 31, 2021USD ($)
2022	$ 928
2023	955
2024	402
Total lease payments to be received	$ 2,285

Leases - Additional information

Leases - Additional information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating leases right of use assets	$ 4,624,000
Short-term lease liabilities	1,551,000	$ 1,629,000
Long-term lease liabilities	3,225,000	2,968,000
Short-term lease cost	$ 1,968,000	1,943,000
Weighted-average remaining lease term	4 years 1 month 6 days
Weighted-average discount rate	2.97%
Additional interest factor	1.375%
Lease liabilities paid	$ 1,876,000	1,930,000
ROU assets in exchange for new operating lease liabilities	2,267,000	2,029,000
Lease income	792,000	792,000	$ 792,000
Operating lease liability additions	$ 2,256,000	$ 1,935,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Operating leases right of use assets

Other Income (Expense), Net - C

Other Income (Expense), Net - Components of Other Income (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Income and Expenses [Abstract]
Interest income	$ 930,000	$ 95,000	$ 300,000
Rental income, net	792,000	792,000	792,000
(Loss) gain on disposal of equipment	(72,000)	13,000	38,000
Foreign currency gains (losses), net	(336,000)	181,000	(108,000)
Other	(111,000)	12,000	44,000
Total other income (expense), net	$ 1,203,000	$ 1,093,000	$ 1,066,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Valuation allowance, deferred tax assets	$ 43,329,000	$ 37,856,000
Research and development tax credit carryforwards	36,041,000	29,046,000
Accrued interest	3,246,000	2,297,000	$ 2,070,000		$ 1,462,000
Net interest expense	19,000	17,000	$ 7,000
Potential payment of interest	52,000	58,000
Stock-based compensation	2,341,000	1,796,000
Maximum [Member]
Income Tax Disclosure [Line Items]
Stock-based compensation	55,300,000	$ 49,500,000
Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Federal net operating loss carryforwards expiry, beginning year				2025
Research and development tax credit carryforwards				$ 13,970,000
Domestic Tax Authority [Member] | Tax Year 2017 [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 25,963,000
Certain States [Member]
Income Tax Disclosure [Line Items]
Federal net operating loss carryforwards expiry, beginning year				2021
Research and development tax credit carryforwards				$ 24,807,000
VICR Certain States Member [Member] | Tax Year 2017 [Member]
Income Tax Disclosure [Line Items]
Federal net operating loss carryforwards expiry, beginning year	2025
Net operating loss carryforwards	$ 24,804,000

Income Taxes - Schedule of Reco

Income Taxes - Schedule of Reconciliation of Federal Statutory Rate on Loss before Income Taxes and before Gain from Sale of Equity Method Investment Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory federal tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal income tax benefit	(4.20%)	(0.50%)	(8.10%)
Increase in valuation allowance	9.20%	41.20%	2.20%
Permanent items	(17.90%)	(48.70%)	(3.90%)
Tax credits	(5.70%)	(11.20%)	(15.60%)
Provision vs. tax return differences	(2.00%)	0.70%	9.00%
Foreign rate differential and deferred items	0.00%	0.10%	0.60%
Other	(0.10%)	0.30%	0.00%
Effective income tax rate	0.30%	2.90%	5.20%

Income Taxes - Schedule of Dome

Income Taxes - Schedule of Domestic and Foreign Components of Income (Loss) Before Income Taxes and before the Gain from Sale of Equity Method Investment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Domestic	$ 56,620	$ 17,688	$ 13,493
Foreign	185	773	1,394
Income before income taxes	$ 56,805	$ 18,461	$ 14,887

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 1	$ 215
State	(14)	93	$ 268
Foreign	171	252	450
Current, Total	158	560	718
Deferred:
Foreign	18	(21)	60
Deferred Income Tax Expense (Benefit)	18	(21)	60
Provision (benefit) for income taxes	$ 176	$ 539	$ 778

Income Taxes - Schedule of Sign

Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Research and development tax credit carryforwards	$ 36,041,000	$ 29,046,000
Net operating loss carryforwards	5,985,000	5,923,000
Stock-based compensation	2,341,000	1,796,000
Inventory reserves	2,268,000	2,282,000
Investment tax credit carryforwards	1,928,000	1,927,000
UNICAP	1,363,000	1,336,000
Vacation accrual	1,338,000	1,349,000
Lease liabilities	787,000	518,000
Accrued payroll tax deferral	384,000	764,000
Other	1,568,000	1,197,000
Total deferred tax assets	54,003,000	46,138,000
Less: Valuation allowance for deferred tax assets	(43,329,000)	(37,856,000)
Net deferred tax assets	10,674,000	8,282,000
Deferred tax liabilities:
Depreciation	(9,048,000)	(6,809,000)
Prepaid expenses	(662,000)	(616,000)
ROU assets	(756,000)	(490,000)
Other	0	(141,000)
Total deferred tax liabilities	(10,466,000)	(8,056,000)
Net deferred tax assets (liabilities)	$ 208,000	$ 226,000

Income Taxes - Schedule of Re_2

Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Beginning Balance	$ 2,297,000	$ 2,070,000	$ 1,462,000
Additions based on tax positions related to the current year	625,000	244,000	571,000
Additions (reductions) for tax positions of prior years	393,000	(13,000)	43,000
Lapse of statute	(69,000)	(4,000)	(6,000)
Unrecognized tax benefits, Ending Balance	$ 3,246,000	$ 2,297,000	$ 2,070,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021USD ($)
Loss Contingencies [Line Items]
Capital expenditure commitments	$ 32,949,000
Capital expenditures incurred but not yet paid	$ 4,803,000