10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2016

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                     

Commission File Number 0-18277

VICOR CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	04-2742817
(State of Incorporation)	(I.R.S. Employer Identification No.)

25 Frontage Road, Andover, Massachusetts 01810

(Address of Principal Executive Office)

(978) 470-2900

(Registrant’s telephone number)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files.)    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	☐	Accelerated filer	☒
Non-accelerated filer	☐  (Do not check if a smaller reporting company)	Smaller reporting company	☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

The number of shares outstanding of each of the issuer’s classes of Common Stock as of October 21, 2016 was:

Common Stock, $.01 par value	27,097,656
Class B Common Stock, $.01 par value	11,758,218

VICOR CORPORATION

INDEX TO FORM 10-Q

	Page
Part I — Financial Information:
Item 1 - Financial Statements (Unaudited)
Condensed Consolidated Balance Sheets at September  30, 2016 and December 31, 2015		1
Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2016 and 2015		2
Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and nine months ended September 30, 2016 and 2015		3
Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2016 and 2015		4
Notes to Condensed Consolidated Financial Statements		5
Item  2 - Management’s Discussion and Analysis of Financial Condition and Results of Operations		18
Item 3 - Quantitative and Qualitative Disclosures About Market Risk		30
Item 4 - Controls and Procedures		30
Part II — Other Information:
Item 1 - Legal Proceedings		32
Item 1A - Risk Factors		32
Item 6 - Exhibits		32
Signature(s)		33
EX-31.1 SECTION 302 CERTIFICATION OF CEO
EX-31.2 SECTION 302 CERTIFICATION OF CFO
EX-32.1 SECTION 906 CERTIFICATION OF CEO
EX-32.2 SECTION 906 CERTIFICATION OF CFO

VICOR CORPORATION

Part I – Financial Information

Item 1 – Financial Statements

Condensed Consolidated Balance Sheets

(In thousands)

(Unaudited)

	September 30, 2016			December 31, 2015
Assets
Current assets:
Cash and cash equivalents	$	55,066		$	62,980
Accounts receivable, less allowance of $154 in 2016 and $171 in 2015		28,026			25,982
Inventories, net		26,562			23,442
Other current assets		3,086			3,102
Total current assets		112,740			115,506
Long-term deferred tax assets, net		11			15
Long-term investments, net		2,580			2,866
Property, plant and equipment, net		37,535			37,450
Other assets		2,172			1,708
Total assets	$	155,038		$	157,545
Liabilities and Equity
Current liabilities:
Accounts payable	$	7,965		$	7,470
Accrued compensation and benefits		8,649			8,349
Accrued expenses		2,178			2,568
Accrued severance charges		—			195
Income taxes payable		23			31
Deferred revenue		2,626			1,988
Total current liabilities		21,441			20,601
Long-term deferred revenue		392			468
Contingent consideration obligations		288			144
Long-term income taxes payable		182			192
Deferred income taxes payable		—			55
Total liabilities		22,303			21,460
Commitments and contingencies (Note 12)
Equity:
Vicor Corporation stockholders’ equity:
Class B Common Stock		118			118
Common Stock		396			395
Additional paid-in capital		174,881			174,337
Retained earnings		96,126			99,685
Accumulated other comprehensive loss		(96	)		(577	)
Treasury stock, at cost		(138,927	)		(138,927	)
Total Vicor Corporation stockholders’ equity		132,498			135,031
Noncontrolling interest		237			1,054
Total equity		132,735			136,085
Total liabilities and equity	$	155,038		$	157,545

See accompanying notes.

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VICOR CORPORATION

Condensed Consolidated Statements of Operations

(In thousands, except per share amounts)

(Unaudited)

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2016		2015			2016			2015
Net revenues	$	53,227	$	48,664		$	152,195		$	168,800
Cost of revenues		27,304		27,378			82,485			92,113
Gross margin		25,923		21,286			69,710			76,687
Operating expenses:
Selling, general and administrative		13,312		13,383			41,643			43,331
Research and development		10,338		10,121			31,824			31,171
Total operating expenses		23,650		23,504			73,467			74,502
Income (loss) from operations		2,273		(2,218	)		(3,757	)		2,185
Other income (expense), net:
Total unrealized gains on available-for-sale securities, net		1		15			54			54
Portion of losses (gains) recognized in other comprehensive income (loss)		2		(11	)		(44	)		(42	)
Net credit gains recognized in earnings		3		4			10			12
Other income (expense), net		208		(3	)		340			(1	)
Total other income (expense), net		211		1			350			11
Income (loss) before income taxes		2,484		(2,217	)		(3,407	)		2,196
Less: Provision for income taxes		133		174			168			374
Gain from sale of equity method investment, net of tax		—		5,000			—			5,000
Consolidated net income (loss)		2,351		2,609			(3,575	)		6,822
Less: Net income (loss) attributable to noncontrolling interest		15		106			(16	)		143
Net income (loss) attributable to Vicor Corporation	$	2,336	$	2,503		$	(3,559	)	$	6,679
Net income (loss) per common share attributable to Vicor Corporation:
Basic	$	0.06	$	0.06		$	(0.09	)	$	0.17
Diluted	$	0.06	$	0.06		$	(0.09	)	$	0.17
Shares used to compute net income (loss) per common share attributable to Vicor Corporation:
Basic		38,837		38,786			38,811			38,742
Diluted		39,184		39,086			38,811			39,176

See accompanying notes.

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VICOR CORPORATION

Condensed Consolidated Statements of Comprehensive Income (Loss)

(In thousands)

(Unaudited)

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2016			2015		2016			2015
Consolidated net income (loss)	$	2,351		$	2,609	$	(3,575	)	$	6,822
Foreign currency translation gains (losses), net of tax (1)		56			61		473			(36	)
Unrealized (losses) gains on available-for-sale securities, net of tax (2)		(2	)		11		44			45
Other comprehensive income		54			72		517			9
Consolidated comprehensive income (loss)		2,405			2,681		(3,058	)		6,831
Less: Comprehensive income (loss) attributable to noncontrolling interest		19			110		20			142
Comprehensive income (loss) attributable to Vicor Corporation	$	2,386		$	2,571	$	(3,078	)	$	6,689

(1) Net of tax provision (benefit) of $0 for the three and nine months ended September 30, 2016 and 2015.

(2) The deferred tax assets associated with cumulative unrealized losses on available-for-sale securities are completely offset by a tax valuation allowance as of September 30, 2016 and 2015. Therefore, there is no net income tax provision (benefit) recognized for the three and nine months ended September 30, 2016 and 2015.

See accompanying notes.

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VICOR CORPORATION

Condensed Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)

	Nine Months Ended
	September 30,
	2016			2015
Operating activities:
Consolidated net income (loss)	$	(3,575	)	$	6,822
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used for) operating activities:
Depreciation and amortization		6,384			6,954
Gain from sale of equity method investment		—			(5,000	)
Stock-based compensation expense, net		171			1,392
Increase in other assets		(505	)		—
Decrease in long-term deferred revenue		(76	)		(103	)
Deferred income taxes		(51	)		—
Benefit for doubtful accounts		(22	)		(18	)
Loss (gain) on disposal of equipment		4			(54	)
Credit gain on available-for-sale securities		(10	)		(12	)
(Decrease) increase in long-term income taxes payable		(10	)		8
Change in current assets and liabilities, net		(3,894	)		2,959
Net cash (used for) provided by operating activities		(1,584	)		12,948
Investing activities:
Additions to property, plant and equipment		(6,368	)		(5,596	)
Proceeds from sale of equity method investment		—			5,000
Sales and maturities of investments		—			360
Proceeds from sale of equipment		2			54
Increase in other assets		(18	)		(156	)
Net cash used for investing activities		(6,384	)		(338	)
Financing activities:
Proceeds from issuance of Common Stock		455			781
Payment of contingent consideration obligations		(64	)		—
Acquisition of noncontrolling interest		(372	)		—
Net cash provided by financing activities		19			781
Effect of foreign exchange rates on cash		35			(7	)
Net (decrease) increase in cash and cash equivalents		(7,914	)		13,384
Cash and cash equivalents at beginning of period		62,980			55,187
Cash and cash equivalents at end of period	$	55,066		$	68,571

See accompanying notes.

-4-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

1. Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements of Vicor Corporation and its consolidated subsidiaries (collectively, the “Company”) have been prepared in accordance with generally accepted accounting principles for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, these interim financial statements do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2016 are not necessarily indicative of the results that may be expected for any other interim period or the year ending December 31, 2016. The balance sheet at December 31, 2015 presented herein has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 filed by the Company with the Securities and Exchange Commission on March 8, 2016.

2. Long-Term Investments

As of September 30, 2016 and December 31, 2015, the Company held one auction rate security that had experienced failed auctions of $3,000,000 at par value, which was purchased through and is held by a broker-dealer affiliate of Bank of America, N.A. (the “Failed Auction Security”). The Failed Auction Security held by the Company is Aaa/AA+ rated by major credit rating agencies, collateralized by student loans, and guaranteed by the U.S. Department of Education under the Federal Family Education Loan Program. Management is not aware of any reason to believe the issuer of the Failed Auction Security is presently at risk of default. Through September 30, 2016, the Company has continued to receive interest payments on the Failed Auction Security in accordance with the terms of its indenture. Management believes the Company ultimately should be able to liquidate the Failed Auction Security without significant loss primarily due to the overall quality of the issue held and the collateral securing the substantial majority of the underlying obligation. However, current conditions in the auction rate securities market have led management to conclude the recovery period for the Failed Auction Security exceeds 12 months. As a result, the Company continued to classify the Failed Auction Security as long-term as of September 30, 2016.

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

September 30, 2016	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Failed Auction Security	$	3,000	$	—	$	420	$	2,580

December 31, 2015	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Failed Auction Security	$	3,000	$	—	$	474	$	2,526
Brokered certificates of deposit		340		—		—		340
	$	3,340	$	—	$	474	$	2,866

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VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

As of September 30, 2016, 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 Failed Auction Security on September 30, 2016, by contractual maturity, is shown below (in thousands):

	Cost		Estimated Fair Value
Due in twenty-six years	$	3,000	$	2,580

Based on the fair value measurements described in Note 3, the fair value of the Failed Auction Security on September 30, 2016, with a par value of $3,000,000, was estimated by the Company to be approximately $2,580,000. The gross unrealized loss of $420,000 on the Failed Auction Security consists of two types of estimated loss: an aggregate credit loss of $62,000 and an aggregate temporary impairment of $358,000. In determining the amount of credit loss, the Company compared the present value of cash flows expected to be collected to the amortized cost basis of the security, considering credit default risk probabilities and changes in credit ratings as significant inputs, among other factors (See Note 3).

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

	2016			2015
Balance at the beginning of the period	$	72		$	84
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized		(10	)		(12	)
Balance at the end of the period	$	62		$	72

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

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

3. 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.

-6-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

Assets measured at fair value on a recurring basis included the following as of September 30, 2016 (in thousands):

	Using
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value as of September 30, 2016
Cash equivalents:
Money market funds	$	9,989	$	—	$	—		$	9,989
Long-term investments:
Failed Auction Security		—		—		2,580			2,580
Liabilities:
Contingent consideration obligations		—		—		(288	)		(288	)

Assets measured at fair value on a recurring basis included the following as of December 31, 2015 (in thousands):

	Using
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value as of December 31, 2015
Cash equivalents:
Money market funds	$	10,412	$	—	$	—		$	10,412
Long-term investments:
Failed Auction Security		—		—		2,526			2,526
Brokered certificates of deposit		—		340		—			340
Liabilities:
Contingent consideration obligation		—		—		(144	)		(144	)

The Company has classified its contingent consideration obligations as Level 3 because the fair value for these liabilities was determined using unobservable inputs. The liabilities were based on estimated sales of legacy products over the period of royalty payments at the royalty rate (see Note 8), discounted using the Company’s estimated cost of capital.

The Company has classified its brokered certificates of deposit as Level 2 because the fair value for these investments was determined utilizing observable inputs from non-active markets. The fair values fluctuate with changes in market interest rates obtained from information available in publicly quoted markets. Management tested the reported fair values by comparing them to net present value calculations utilizing a discount rate based on U.S. Treasury bill and bond yields for similar maturities.

As of September 30, 2016, there was insufficient observable auction rate security market information available to determine the fair value of the Failed Auction Security using Level 1 or Level 2 inputs. As such, the Company’s investment in the Failed Auction Security was deemed to require valuation using Level 3 inputs. Management, after consulting with advisors, valued the Failed Auction Security using analyses and pricing models similar to those used by market participants (i.e., buyers, sellers, and the broker-dealers responsible for execution of the Dutch auction pricing mechanism by which each issue’s interest rate was set). Management utilized a probability weighted discounted cash flow (“DCF”) model to determine the estimated fair value of this security as of September 30, 2016. The major assumptions used in preparing the DCF model included: estimates for the amount

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VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

and timing of future interest and principal payments based on default probability assumptions used to measure the credit loss of 2.1%; the rate of return required by investors to own this type of security in the current environment, which management estimates to be 5.0% above the risk free rate of return; and an estimated timeframe of three to five years for successful auctions for this type of security to occur. In making these assumptions, management considered relevant factors including: the formula applicable to the security defining the interest rate paid to investors in the event of a failed auction (the “Penalty Rate”); forward projections of the interest rate benchmarks specified in such formulas; the likely timing of principal repayments; the probability of full repayment considering the guarantees by the U.S. Department of Education of the underlying student loans, guarantees by other third parties, and additional credit enhancements provided through other means; and publicly available pricing data for recently issued student loan asset-backed securities not subject to auctions. In developing its estimate of the rate of return required by investors to own the security, management compared the Penalty Rate of the Failed Auction Security with yields of actively traded long-term bonds with similar characteristics and, reflecting the limited liquidity for auction rate securities and the discounts to par value seen in recent tender offers by issuers and arm’s length market transactions between informed buyers and sellers, estimated the implied yield (i.e., the discount to par value) necessary to complete a sale of the Failed Auction Security. Management has calculated an increase or decrease in the liquidity risk premium of 5.0% referenced above of 1.0% (i.e., 100 basis points) as used in the model, would decrease or increase, respectively, the fair value of the Failed Auction Security by approximately $100,000.

For purposes of the valuation process for the Failed Auction Security, “management” consists of senior members of the Company’s finance department. The fair value measurements for the Failed Auction Security are reviewed and updated on a quarterly basis. The calculations are prepared by the Company’s Corporate Controller, in conjunction with information provided by its valuation advisors, and include the development and substantiation of the unobservable inputs. The methodology, assumptions, and calculations are reviewed and approved by the Company’s Chief Financial Officer and Chief Accounting Officer.

The significant unobservable inputs used in the fair value measurement of the Failed Auction Security are the cumulative probability of earning the maximum rate until maturity, the cumulative probability of principal return prior to maturity, the cumulative probability of default, the liquidity risk premium, and the recovery rate in default. Significant increases (decreases) in any of those inputs in isolation would result in changes in fair value measurement. Significant increases (decreases) in the cumulative probability of earning the maximum rate until maturity, the cumulative probability of principal return prior to maturity, and the recovery rate in default would result in a higher (lower) fair value measurement, while increases (decreases) in the cumulative probability of default and the liquidity risk premium would result in a lower (higher) fair value measurement.

Generally, the interrelationships are such that a change in the assumption used for the cumulative probability of principal return prior to maturity is accompanied by a directionally similar change in the assumption used for the cumulative probability of earning the maximum rate until maturity and a directionally opposite change in the assumptions used for the cumulative probability of default and the liquidity risk premium. The recovery rate in default is somewhat independent and based upon the security’s specific underlying assets and published recovery rate indices.

-8-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

Quantitative information about Level 3 fair value measurements as of September 30, 2016 is as follows (dollars in thousands):

	Fair Value		Valuation Technique		Unobservable Input	Weighted Average
Failed Auction Security	$	2,580		Discounted cash flow	Cumulative probability of earning the maximum rate until maturity		0.03	%
					Cumulative probability of principal return prior to maturity		94.82	%
					Cumulative probability of default		5.15	%
					Liquidity risk premium		5.00	%
					Recovery rate in default		40.00	%

The change in the estimated fair value calculated for the investment valued on a recurring basis utilizing Level 3 inputs (i.e., the Failed Auction Security) for the nine months ended September 30, 2016 was as follows (in thousands):

Balance at the beginning of the period	$	2,526
Credit gain on available-for-sale securities included in Other income (expense), net		10
Gain included in Other comprehensive income (loss)		44
Balance at the end of the period	$	2,580

The change in the estimated fair value calculated for the liabilities valued on a recurring basis utilizing Level 3 inputs (i.e., the Contingent consideration obligations) for the nine months ended September 30, 2016 was as follows (in thousands):

Balance at the beginning of the period	$	144
Obligation incurred upon acquisition of noncontrolling interest (see Note 8)		208
Payments		(64	)
Balance at the end of the period	$	288

There were no transfers between Level 1 and Level 2 of the fair value hierarchy during the nine months ended September 30, 2016.

-9-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

4. Stock-Based Compensation

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards as of their grant date. Stock-based compensation expense, net for the three and nine months ended September 30 was as follows (in thousands):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2016			2015		2016			2015
Cost of revenues	$	(47	)	$	51	$	59		$	170
Selling, general and administrative		(327	)		215		148			975
Research and development		(124	)		75		(36	)		247
Total stock-based compensation	$	(498	)	$	341	$	171		$	1,392

On December 31, 2010, the Company granted 2,984,250 non-qualified stock options under the VI Chip 2007 Stock Option and Incentive Plan with performance-based vesting provisions tied to achievement of certain margin targets by VI Chip Corporation. As of December 31, 2010, the Company determined it was probable the margin targets could be achieved and, accordingly, began recording stock-based compensation expense relating to these options beginning January 1, 2011. During the third quarter of 2016, the Company determined the margin targets would not be met prior to the expiration date of the corresponding options, as VI Chip’s revenue growth has been below levels necessary to achieve the targets. As a result, in accordance with the accounting guidance for performance-based stock options, the Company reversed approximately $768,000 of previously recorded stock-based compensation expense in the third quarter of 2016, representing all expense taken for these performance-based options through June 30, 2016. This resulted in decreases in cost of revenues of $86,000, selling, general and administrative expense of $516,000, and research and development expense of $166,000 for the three and nine months ended September 30, 2016.

-10-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

5. Net Income (Loss) per Share

The following table sets forth the computation of basic and diluted net income (loss) per share for the three and nine months ended September 30 (in thousands, except per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016			2015
Numerator:
Net income (loss) attributable to Vicor Corporation	$	2,336	$	2,503	$	(3,559	)	$	6,679
Denominator:
Denominator for basic net income (loss) per share-weighted average shares (1)		38,837		38,786		38,811			38,742
Effect of dilutive securities:
Employee stock options (2)		347		300		—			434
Denominator for diluted net income (loss) per share – adjusted weighted-average shares and assumed conversions		39,184		39,086		38,811			39,176
Basic net income (loss) per share	$	0.06	$	0.06	$	(0.09	)	$	0.17
Diluted net income (loss) per share	$	0.06	$	0.06	$	(0.09	)	$	0.17

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

(2) Options to purchase 449,464 and 1,845,289 shares of Common Stock for the three and nine months ended September 30, 2016, respectively, were not included in the calculation of net income (loss) per share as the effect would have been antidilutive. Options to purchase 533,689 and 141,971 shares of Common Stock for the three and nine months ended September 30, 2015, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.

6. Inventories

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

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

-11-

VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

Inventories were as follows (in thousands):

	September 30, 2016		December 31, 2015
Raw materials	$	19,652	$	16,257
Work-in-process		2,991		2,879
Finished goods		3,919		4,306
Net balance	$	26,562	$	23,442

7. Other Investments

In September 2015, Intersil Corporation (“Intersil”) acquired Great Wall Semiconductor Corporation (“GWS”). At that time, the Company’s gross investment in non-voting convertible preferred stock of GWS totaled $4,999,719, giving the Company an approximately 27% ownership interest in GWS. The Company received cash consideration of $4,999,719 for its investment from Intersil, representing full preference value of its shares of non-voting convertible preferred stock of GWS. Since the investment in GWS had previously been written down to zero, the full amount of the consideration was recorded as a gain from sale of equity method investment in the third quarter of 2015.

8. Noncontrolling Interest Transactions

On March 30, 2016, the Company acquired 100% ownership of certain operating assets and cash of its consolidated subsidiary, Converpower Corporation (“Converpower”), in which it held a 49% ownership interest. The operating assets and cash were acquired in exchange for the Company’s common shares representing that 49% interest and the aggregate dollar amount of royalty payments to be made by the Company to Converpower. The transaction was executed through a newly-formed, wholly-owned subsidiary, Granite Power Technologies, Inc. (“GPT”), the business operations of which had formerly existed as a division of Vicor Corporation. The shares of Converpower common stock held by the Company were contributed to GPT prior to the transaction. At the same time that it entered into the Asset Purchase Agreement associated with this transaction, the Company and Converpower entered into a license agreement providing the Company the right to continue manufacturing certain Converpower products in exchange for payment of royalties, quarterly through June 30, 2021, equal to a percentage of the revenue generated by the manufacture and sale of these products by GPT. The estimated present value of total future royalties, included in “Contingent consideration obligations” in the accompanying Condensed Consolidated Balance Sheet as of September 30, 2016, is $185,000 (initially $208,000, as of March 31, 2016). Although the Company exchanged its shares representing its 49% equity interest in Converpower, it acquired 100% control of the business operations. Accordingly, this transaction was accounted for as an acquisition of a noncontrolling interest (i.e., an equity transaction). As such, the noncontrolling interest balance in equity associated with Converpower was reduced to zero, and the additional paid-in capital account was reduced by $208,000, the estimated present value of total future royalties as of March 31, 2016. As a result of the transactions associated with the consolidation of the Converpower operation into GPT, the Company’s aggregate balance of cash, short-term interest receivable, and long-term investments on its Condensed Consolidated Balance Sheet as of March 31, 2016, declined by approximately $718,000. No amounts were recorded in the Condensed Consolidated Statement of Operations related to these transactions.

The respective noncontrolling interest holders of Converpower served as key employees of Converpower prior to the transactions described above.

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VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

9. Severance and Other Charges

A summary of the activity related to the accrued severance charges is as follows (in thousands):

Balance as of December 31, 2015	$	195
Payments		(195	)
Balance as of September 30, 2016	$	—

10. Product Warranties

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

Product warranty activity for the three and nine months ended September 30 was as follows (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Balance at the beginning of the period	$	496		$	332		$	584		$	204
Accruals for warranties for products sold in the period		61			280			291			465
Fulfillment of warranty obligations		(106	)		(18	)		(374	)		(75	)
Revisions of estimated obligations		(109	)		—			(159	)		—
Balance at the end of the period	$	342		$	594		$	342		$	594

11. Income Taxes

The tax provision is based on the estimated annual effective tax rate for the year, which includes estimated federal, state and foreign income taxes on the Company’s projected pre-tax income (loss) and, in 2015, for estimated federal and state income taxes for certain noncontrolling interest subsidiaries that were not part of the Company’s consolidated income tax returns.

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VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

The provisions for income taxes and the effective income tax rates for the three and nine months ended September 30 were as follows (dollars in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Provision for income taxes	$	133		$	174		$	168		$	374
Effective income tax rate		5.4	%		7.8	%		4.9	%		17.0	%

The Company’s effective tax rate was lower than the statutory tax rate in each 2016 and 2015 period due to the utilization of net operating losses. The provisions for the three and nine months ended September 30, 2016 were primarily due to estimated state taxes in jurisdictions in which the Company does not have net operating loss carryforwards. No tax benefit could be recognized for the majority of the Company’s losses during the periods due to a full valuation allowance against all net domestic deferred tax assets. In addition, in connection with the Company’s acquisition of 100% ownership of certain operating assets and cash of Converpower, the related deferred tax liability for unremitted earnings of $55,000 was reversed and recorded as a discrete benefit in the first quarter of 2016 (see Note 8). The provisions for the three and nine months ended September 30, 2015 were primarily due to estimated federal and state taxes for one noncontrolling interest subsidiary, and for estimated state taxes in jurisdictions in which the Company does not have net operating loss carryforwards.

As of September 30, 2016, the Company continues to maintain a valuation allowance of approximately $25,855,000 against all domestic net deferred tax assets and the majority of foreign net deferred tax assets, for which realization cannot be considered more likely than not at this time.

12. Commitments and Contingencies

At September 30, 2016, the Company had approximately $596,000 of capital expenditure commitments.

On January 28, 2011, SynQor, Inc. (“SynQor”) filed a complaint for patent infringement against Ericsson, Inc. (“Ericsson”), Cisco Systems, Inc. (“Cisco”) and the Company in the U.S. District Court for the Eastern District of Texas (the “Texas Action”). Ericsson and Cisco subsequently settled with SynQor and are no longer parties to the Texas Action. With respect to the Company, SynQor’s complaint in the Texas Action alleged 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, and 7,564,702 (“the ‘190 patent”, “the ‘021 patent” and “the ‘702 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. On September 20, 2011, SynQor filed an amended complaint in the Texas Action that further alleged 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 number 8,023,290 (“the ‘290 patent”). The Company responded to SynQor’s amended complaint in the Texas Action by denying that it infringes any of the SynQor patents, and asserting that the SynQor patents are invalid. The Company has further alleged that the SynQor ‘290 patent is unenforceable due to inequitable conduct by SynQor or its agents during the examination of the ‘290 patent at the United States Patent and Trademark Office (“USPTO”). The Company has also asserted counterclaims seeking damages against SynQor for deceptive trade practices and tortious interference with prospective economic advantage arising from SynQor’s attempted enforcement of its patents against the Company.

The Company has initiated administrative review proceedings at the USPTO challenging the validity of certain claims of the SynQor patents asserted in the Texas Action, including all claims that were asserted against the Company by SynQor. Regarding the ‘190 patent, the Patent Trial and Appeal Board (“PTAB”) of the USPTO issued a decision upholding the validity of the ‘190 patent claims. That decision was appealed by the Company to the United States Court of Appeals for the Federal Circuit (“the Federal Circuit”), which issued a decision on March 13, 2015 reversing the PTAB, determining that certain claims were invalid, and remanding the matter to the PTAB for further proceedings. On May 2, 2016, the PTAB issued a decision determining that all but one

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VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

of the remaining claims of the ‘190 patent were invalid and remanding the remaining claim to a patent examiner for further examination. In addition, on that date, the PTAB issued decisions finding all challenged claims of SynQor’s ‘021 patent invalid and upholding the validity of all challenged claims of SynQor’s ‘702 and ‘290 patents. The Company has filed an appeal with the Federal Circuit from the PTAB’s decision upholding the validity of the challenged claims of the ‘702 and ‘290 patents. SynQor has filed an appeal with the Federal Circuit from the PTAB’s decision that the challenged claims of the ‘021 patent are invalid. Decisions in these appeals are not expected until 2017. On May 23, 2016, the Texas Court issued an order staying the Texas Action until the completion of all of the administrative review proceedings concerning the asserted SynQor patents, including any appeals from such proceedings to the Federal Circuit.

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, including such use by Cisco. The Company believes SynQor’s claims lack merit and, therefore, continues to vigorously defend itself against SynQor’s patent infringement allegations. The Company does not believe a loss is probable for this matter. If a loss were to be incurred, however, the Company cannot estimate the amount of possible loss or range of possible loss at this time.

In addition to the SynQor matter, the Company is involved in certain other litigation and claims incidental to the conduct of its business. While the outcome of lawsuits and claims against the Company cannot be predicted with certainty, management does not expect any current litigation or claims to have a material adverse impact on the Company’s financial position or results of operations.

13. Segment Information

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

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

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VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

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

	BBU		VI Chip			Picor			Corporate			Eliminations (1)			Total
2016:
Net revenues	$	38,518	$	11,961		$	5,320		$	—		$	(2,572	)	$	53,227
Income (loss) from operations		3,734		(1,915	)		627			(173	)		—			2,273
Total assets		193,115		21,453			6,928			72,521			(138,979	)		155,038
Depreciation and amortization		1,025		531			142			375			—			2,073
2015:
Net revenues	$	41,119	$	6,023		$	2,791		$	—		$	(1,269	)	$	48,664
Income (loss) from operations		5,612		(6,564	)		(1,169	)		(97	)		—			(2,218	)
Total assets		163,801		15,372			4,796			88,142			(108,836	)		163,275
Depreciation and amortization		1,119		633			123			356			—			2,231

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

	BBU		VI Chip			Picor			Corporate			Eliminations (1)			Total
2016:
Net revenues	$	115,963	$	30,126		$	12,596		$	—		$	(6,490	)	$	152,195
Income (loss) from operations		9,475		(12,131	)		(510	)		(591	)		—			(3,757	)
Total assets		193,115		21,453			6,928			72,521			(138,979	)		155,038
Depreciation and amortization		3,293		1,660			404			1,027			—			6,384
2015:
Net revenues	$	131,396	$	28,939		$	13,870		$	—		$	(5,405	)	$	168,800
Income (loss) from operations		17,618		(15,336	)		474			(571	)		—			2,185
Total assets		163,801		15,372			4,796			88,142			(108,836	)		163,275
Depreciation and amortization		3,424		2,150			318			1,062			—			6,954

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

14. Impact of Recently Issued Accounting Standards

In August 2016, the Financial Accounting Standards Board (“FASB”) issued guidance to clarify how certain cash receipts and cash payments should be presented in the statement of cash flows. These include debt prepayment, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, distributions received from equity method investees and beneficial interests in securitization transactions. The new guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. The Company has not yet determined the impact this new guidance will have on its consolidated financial statements and related disclosures.

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VICOR CORPORATION

Notes to Condensed Consolidated Financial Statements

September 30, 2016

(unaudited)

In March 2016, the FASB issued new guidance for employee share-based payment accounting, which makes several modifications to existing guidance related to the accounting for forfeitures, employer tax withholding on share-based compensation and the financial statement presentation of excess tax benefits or deficiencies. This new guidance also clarifies the statement of cash flows presentation for certain components of share-based awards. The standard is effective for interim and annual reporting periods beginning after December 15, 2016, with early adoption permitted. The Company has not yet determined the impact this new guidance will have on its consolidated financial statements and related disclosures.

In February 2016, the FASB issued new guidance for lease accounting, which will require lessees to recognize all leases with a duration of greater than twelve months on the balance sheet. For lessors, the guidance modifies the classification criteria and accounting for sales-type and direct financing leases. The new standard is effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted. The Company has not yet determined the impact this new guidance will have on its consolidated financial statements and related disclosures.

In July 2015, the FASB issued new guidance for inventory accounting, which will require companies to measure in scope inventory at the lower of cost or net realizable value. Current guidance requires an entity to measure inventory at the lower of cost or market. The new guidance does not apply to inventory that is measured using last-in, first-out (“LIFO”) or retail inventory methods. The guidance applies to all other inventory, which includes inventory that is measured using first-in, first-out (“FIFO”), which the Company employs, or average cost methods. The new guidance will be effective for the Company on January 1, 2017, and is to be applied prospectively with earlier application permitted as of the beginning of an interim or annual reporting period. The Company does not anticipate the new guidance will have a material impact on its consolidated financial statements and related disclosures.

In May 2014, the FASB issued new guidance for revenue recognition, which will require an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The new guidance will replace most existing revenue recognition guidance in U.S. Generally Accepted Accounting Principles when it becomes effective which, for the Company, will now be on January 1, 2018, as on July 9, 2015, the FASB voted to defer the effective date of the new standard by one year. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect the new guidance will have on its consolidated financial statements and related disclosures. While the Company has begun its assessment of the new standard and plans to utilize the cumulative effect transition method, it has not yet determined the effect the standard will have on its ongoing financial reporting.

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VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September  30, 2016

Item 2 — Management’s Discussion and Analysis of Financial Condition and Results of Operations

Except for statements of historical fact contained herein, statements in this report constitute forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The words “believes,” “expects,” “anticipates,” “intends,” “estimates,” “plans,” “assumes,” “may,” “will,” “would,” “should,” “continue,” “prospective,” “project,” and other similar words or expressions identify forward-looking statements. Forward-looking statements include, without limitation, statements regarding the transition of the Company’s business strategically and organizationally from serving a large number of relatively low volume customers across diversified markets and geographies to serving a small number of relatively large volume customers, typically concentrated in computing and communications; the level of customer orders overall and, in particular, from large customers and the delivery lead times associated therewith; the financial and operational impact of customer changes to shipping schedules; the derivation of a portion of the Company’s sales in each quarter from orders booked in the same quarter; the Company’s ongoing development of power conversion architectures, switching topologies, packaging technologies, and products; the Company’s plans to invest in expanded manufacturing capacity and the timing and location thereof; the Company’s continued success depending in part on its ability to attract and retain qualified personnel; the Company’s belief that cash generated from operations and the total of its cash and cash equivalents will be sufficient to fund operations for the foreseeable future; the Company’s belief that it has limited exposure to currency risks; the Company’s intentions regarding the declaration and payment of cash dividends; the Company’s intentions regarding protecting its rights under its patents; and the Company’s expectation that no current litigation or claims will have a material adverse impact on its financial position or results of operations. These statements are based upon the Company’s current expectations and estimates as to the prospective events and circumstances which may or may not be within the Company’s control and as to which there can be no assurance. Actual results could differ materially from those expressed or implied by forward-looking statements as a result of various factors, including the Company’s ability to: grow its revenues, establish and maintain profitability, develop and market new products and technologies cost effectively, and on a timely basis leverage the Company’s new technologies in standard products to promote market acceptance of the Company’s new approach to power system architecture; leverage design wins into increased product sales; continue to meet requirements of key customers and prospects; enter into licensing agreements increasing the Company’s market opportunity and accelerating market penetration; realize significant royalties under such licensing agreements; achieve sustainable bookings rates for the Company’s products across served markets and geographies; improve manufacturing and operating efficiencies; successfully enforce the Company’s intellectual property rights; successfully defend outstanding litigation; hire and retain key personnel; and maintain an effective system of internal controls over financial reporting, including the Company’s ability to obtain required financial information for investments on a timely basis, the Company’s ability to assess the value of assets, including illiquid investments, and the accounting therefor. These and other factors that may influence actual results are described in the risk factors set forth in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015, under Part I, Item I — “Business,” under Part I, Item 1A — “Risk Factors,” under Part I, Item 3 — “Legal Proceedings,” and under Part II, Item 7 — “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” The risk factors contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 may not be exhaustive. Therefore, the information contained therein should be read together with other reports and documents that the Company files with the Securities and Exchange Commission from time to time, including Forms 10-Q, 8-K and 10-K, which may supplement, modify, supersede or update those risk factors. Except as required by law, the Company does not undertake any obligation to update any forward-looking statements as a result of future events or developments.

Overview

We design, develop, manufacture, and market modular power components and power systems for converting, regulating, and controlling electric current. We also license certain rights to our technology in return for recurring royalties. The principal customers for our power converters and systems are large original equipment manufacturers (“OEMs”) and their contract manufacturers, and smaller, lower volume users. We serve a broad range of market segments and geographies worldwide.

We have organized our business segments according to our key product lines. Reflecting our history and direction, we broadly categorize our products as either “legacy” or “advanced”, generally based on design, performance, and form factor considerations, as well as the range of applications for which the products are appropriate.

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VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

The BBU segment designs, develops, manufactures and markets our legacy lines of DC-DC converters and configurable products, as well as complementary components providing AC line rectification, input filtering, power factor correction, and transient protection. The BBU segment also includes the BBU business conducted through VJCL and our Vicor Custom Power subsidiaries. The BBU has customers concentrated in aerospace and aviation, defense electronics, industrial automation and equipment, medical diagnostics, rail transportation, and test and measurement instrumentation.

As previously disclosed, on March 30, 2016, we acquired 100% ownership of certain operating assets and cash of Converpower Corporation (“Converpower”). We also entered into a license with Converpower allowing us to continue manufacturing certain products and supporting existing customers. With the closing of the Converpower transaction, we have completed the consolidation of our Vicor Custom Power operations into three wholly-owned subsidiaries.

The VI Chip segment consists of our subsidiary, VI Chip Corporation, which designs, develops, manufactures, and markets many of our advanced power component products. The VI Chip segment also includes the VI Chip business conducted through VJCL. VI Chip targets large, high-volume customers concentrated in the datacenter and supercomputer segments of the computing market, although we also target applications in aerospace and aviation, defense electronics, electric and hybrid vehicles, instrumentation and test equipment, and networking equipment.

The Picor segment consists of our subsidiary, Picor Corporation, which designs, develops, manufactures, and markets integrated circuits and related solid-state products for use in a variety of power management and power system applications. Picor develops these products for use in our BBU and VI Chip modules, to be sold as complements to our BBU and VI Chip products, or for sale to third parties for separate (i.e., stand-alone) applications, often integrated with VI Chip products to represent a customer solution, particularly in the datacenter and supercomputer segments of the computing market.

Our consolidated results continued to reflect recent trends and circumstances, particularly the negative influence on our revenue and profitability of general weakness of demand for our legacy products due to global macroeconomic uncertainty. Customer interest in our expanding portfolio of advanced products continues to increase, but we are encountering longer sales cycles than originally anticipated, attributable, in part, to the same trends and circumstances influencing our legacy product lines. However, since the first quarter of 2016, our 48 Volt to Point-of-Load solutions have received significant, high profile recognition from customers, user groups, and trade publications. We believe this heightened visibility, along with the implied endorsements of our solutions, will contribute to shortened sales cycles.

We believe the following factors influenced our results for the third quarter of 2016 and may continue to influence our results for the foreseeable future:

• Global demand for our legacy brick converters, configurable products, and associated components remains weak and unpredictable, given the macroeconomic variables underlying customer confidence across industries and geographies. Our legacy products are commonly used in high-value capital goods and sizeable infrastructure projects, the end demand for which has lagged, reflecting low-growth economies and budgetary uncertainty. Although we have completed initiatives to reduce our exposure to certain problematic market segments, notably the custom portion of defense electronics, we expect to experience relatively flat aggregate demand for the BBU until macroeconomic trends improve.

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VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

• Our profitability is closely aligned with production volumes, as evidenced by our improved third quarter gross margin performance. We manufacture our products in Andover, Massachusetts, in a state-of-the-art, highly automated factory. While direct labor and associated costs are scaled with volume, extended periods of low activity and/or small production runs contribute to lower profitability, largely due to lower overhead absorption, which is less scalable, given the sophistication and complexity of our manufacturing processes. An additional influence on product-level profitability has been the availability and delivery timing of certain materials and components we use in our products. Due to the same economic uncertainty we and our customers are experiencing, our suppliers are facing production and scheduling challenges. While first quarter shipments of legacy products were lower, in part, due to supplier delays, our aggressive efforts to improve supply continuity and inventory management resulted in no such delays during the subsequent two quarters. Although our actions have reduced the likelihood and potential impact of supply chain disruption, we anticipate supplier delays may again be an influence on production volumes for the foreseeable future.

• We have focused our organization on the promising opportunities for our advanced products, in which we have invested a substantial amount of research and development effort and dollars. Many of these opportunities are in the early phases of expansion, and we are committed to expanding our product lines and our ability to serve and support customers in pursuit of these opportunities. As such, our operating costs have been high, relative to revenue levels, and likely will remain relatively high until revenue from our legacy products recovers and revenue from our newer advanced products increases on a sustained basis.

• Customer adoption of certain new products has been delayed by unanticipated market influences beyond our control. For example, our leadership position in the transition of datacenter computing to 48 Volt to Point-of-Load solutions using our Factorized Power Architecture was the basis for our expectation of an earlier, higher-volume uptake of such solutions and our decisions to focus our resources on such opportunities. However, delays in the transition of processor generations and associated supply chain disruption caused repeated delays in customer purchase orders. We continue to believe our new products, notably our 48 Volt to Point-of-Load solutions for datacenters, will be adopted in volume by multiple, leading customers, particularly in light of various announcements during the first and second quarters from two industry trade organizations regarding adoption and support of 48 Volt bus architectures. However, we cannot control the actions by, nor the timing, of our customers, their contract manufacturers, or the significant vendors also participating in the market.

• Our consolidated financial results have recently been influenced by adjustments associated with operational restructuring initiatives. As addressed in prior filings, during the first quarter of 2016, we completed the consolidation of our Vicor Custom Power operations, reducing our six domestic locations to three. While this consolidation disrupted the sales, bookings, and manufacturing patterns of the custom operations for the fourth quarter of 2015 and the first quarter of 2016, we believe we are currently achieving our competitive and performance goals.

• During the third quarter of 2016, we reversed approximately $768,000 of stock-based compensation expense related to certain VI Chip performance-based stock options. This resulted in decreases to cost of revenues of $86,000, selling, general, and administrative expense of $516,000 and research and development expense of $166,000 for the three and nine months ended September 30, 2016. (See Note 4 to the Condensed Consolidated Financial Statements).

Consolidated net revenues for the third quarter of 2016 increased by 9.4% to $53,227,000 from $48,664,000 for the third quarter of 2015, primarily due to higher customer bookings in the third quarter of 2016 compared to the third quarter of 2015, and increased by 0.5% on a sequential basis from $52,941,000 for the second quarter of 2016. Export sales as a percentage of total revenues for the respective quarters ended September 30, 2016 and 2015 were approximately 59% and 57%, reflecting the relatively high volume, during the third quarter of 2016, of shipments to off-shore contract manufacturers serving customers of our 48 Volt to Point-of-Load solutions. Gross margin increased to $25,923,000 for the third quarter of 2016 from $21,286,000 for the third quarter of 2015, and

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VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

increased on a sequential basis from $24,471,000 for the second quarter of 2016. Gross margin as a percentage of net revenue increased to 48.7% for the third quarter of 2016 compared to 43.7% for the third quarter of 2015, due to the increase in revenues, and increased on a sequential basis from 46.2% for the second quarter of 2016, due to the sequential increase in revenues and a more favorable product mix.

Consolidated net revenues for the nine months ended September 30, 2016 decreased by 9.8% to $152,195,000 from $168,800,000 for the nine months ended September 30, 2015, primarily due to an overall 12.8% decrease in bookings for the nine months ended June 30, 2016 compared to the nine months ended June 30, 2015. Export sales as a percentage of total revenues for the nine months ended September 30, 2016 and 2015 were approximately 60%. Gross margin decreased to $69,710,000 for the nine months ended September 30, 2016 from $76,687,000 for the nine months ended September 30, 2015. Gross margin as a percentage of revenue increased to 45.8% for the nine months ended September 30, 2016 compared to 45.4% for the nine months ended September 30, 2015. The lower gross margin dollars is primarily due to the lower net revenues, while the higher gross margin percentage was primarily due to a more favorable product mix and lower charges for inventory and warranty reserves in 2016 compared to 2015.

Backlog, representing the total of orders for products for which shipment is scheduled within the next 12 months, was $42,124,000 at the end of the third quarter of 2016, as compared to $41,674,000 at the end of the second quarter of 2016.

Operating expenses for the third quarter of 2016 increased $146,000, or 0.6%, to $23,650,000 from $23,504,000 for the third quarter of 2015, due to an increase in research and development expense of $217,000 partially offset by a decrease in selling, general and administrative expenses of $71,000. The primary elements of the increase in research and development expenses were project and pre-production materials of $372,000 and compensation expenses of $194,000, partially offset by decreases in deferred costs of $206,000, depreciation and amortization of $143,000, and facilities expenses of $57,000. The increase in compensation expense was partially offset by the reversal of stock-based compensation expense, discussed above, of $166,000. The primary components of the decrease in selling, general and administrative expenses were declines in compensation expenses of $188,000, advertising expenses of $103,000, commissions expense of $96,000, and legal fees of $90,000, partially offset by increases in travel expenses of $137,000, outside services of $116,000, and audit, tax, and accounting fees of $98,000. The decrease in compensation expense was due to the reversal of stock-based compensation expense of $516,000, discussed above, partially offset by annual compensation adjustments in May 2016.

Operating expenses for the nine months ended September 30, 2016 decreased $1,035,000, or 1.4%, to $73,467,000 from $74,502,000 for the nine months ended September 30, 2015, primarily due to a decrease in selling, general and administrative expenses of $1,688,000, partially offset by an increase in research and development expense of $653,000. The primary components of the decrease in selling, general and administrative expenses were declines in compensation expenses of $752,000, commissions expense of $581,000, legal fees of $330,000, supplies expense of $166,000, and project expenses of $105,000, partially offset by increases in outside services of $243,000, and travel expenses of $231,000. The primary elements of the increase in research and development expenses were project and pre-production materials of $765,000, compensation expenses of $496,000, and set-up and tooling expenses of $104,000, partially offset by decreases in depreciation and amortization of $211,000, deferred costs of $183,000, and facilities expenses of $178,000.

In September 2015, Intersil Corporation (“Intersil”) acquired Great Wall Semiconductor Corporation (“GWS”). At that time, our gross investment in non-voting convertible preferred stock of GWS totaled $4,999,719, giving us an approximately 27% ownership interest in GWS. We received cash consideration of $4,999,719 for our investment from Intersil, representing full preference value of our shares of non-voting convertible preferred stock of GWS. Since the investment in GWS had previously been written down to zero, the full amount of the consideration was recorded as a gain from sale of equity method investment in the third quarter of 2015.

Net income attributable to Vicor Corporation for the third quarter of 2016 was $2,336,000, or $0.06 per diluted share, compared to net income attributable to Vicor Corporation of $2,503,000, or $0.06 per diluted share, for the third quarter of 2015, and net loss attributable to Vicor Corporation of $(544,000), or $ (0.01) per share, for the second quarter of 2016.

-21-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

Net loss attributable to Vicor Corporation for the nine months ended September 30, 2016, was $(3,559,000), or $(0.09) per share, compared to net income attributable to Vicor Corporation of $6,679,000, or $0.17 per diluted share, for the nine months ended September 30, 2015.

For the nine months ended September 30, 2016, depreciation and amortization totaled $6,384,000, and capital additions totaled $6,368,000, compared to totals of $6,954,000 and $5,596,000, respectively, for the nine months ended September 30, 2015.

Inventories increased by approximately $3,120,000, or 13.3%, to $26,562,000, compared to $23,442,000 at December 31, 2015. This increase was primarily associated with increases in VI Chip and Picor inventories of $2,533,000 and $754,000, respectively, to meet increased bookings for the two segments.

Critical Accounting Policies and Estimates

Please refer to the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 for a summary of the Company’s critical accounting policies and estimates.

Three months ended September 30, 2016, compared to three months ended September 30, 2015

Consolidated net revenues for the third quarter of 2016 were $53,227,000, an increase of $4,563,000, or 9.4%, as compared to $48,664,000 for the third quarter of 2015, and an increase of $286,000, or 0.5%, on a sequential basis from $52,941,000 for the second quarter of 2016.

Net revenues, by segment, for the third quarter of 2016 and the third quarter of 2015 were as follows (dollars in thousands):

					Increase (decrease)
	2016		2015		$			%
BBU	$	38,518	$	41,119	$	(2,601	)		(6.3	)%
VI Chip		11,539		5,789		5,750			99.3	%
Picor		3,170		1,756		1,414			80.5	%
Total	$	53,227	$	48,664	$	4,563			9.4	%

The increase in consolidated net revenues for the third quarter of 2016 from the third quarter of 2015 was primarily due to an overall 6.9% increase in bookings in the third quarter of 2016, compared to the third quarter of 2015. VI Chip and Picor bookings increased by 163.1% and 218.0%, respectively, while BBU bookings declined 18.9%. The decrease in BBU revenues was primarily attributable to a decrease in BBU module and configurable product revenues of approximately $1,816,000 and a decrease in Vicor Custom Power revenues of $1,755,000 due to the consolidation of operations noted above. Revenues recorded by VI Chip for the third quarter of 2016 were associated largely with fulfillment of increased orders for our 48 Volt to Point-of-Load solutions. Customer bookings patterns continue to be unpredictable, particularly for the VI Chip and Picor segments.

Gross margin for the third quarter of 2016 increased $4,637,000, or 21.8%, to $25,923,000, from $21,286,000 for the third quarter of 2015. Gross margin as a percentage of net revenue increased to 48.7% for the third quarter of 2016 compared to 43.7% for the third quarter of 2015, primarily due to the increase in net revenues and a more favorable product mix.

-22-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

Selling, general, and administrative expenses were $13,312,000 for the third quarter of 2016, a decrease of $71,000, or 0.5%, from $13,383,000 for the third quarter of 2015. Selling, general, and administrative expenses as a percentage of net revenues decreased to 25.0% for the third quarter of 2016 from 27.5% for the third quarter of 2015, primarily due to the increase in net revenues.

The components of the $71,000 decrease in selling, general and administrative expenses for the third quarter of 2016 from the third quarter of 2015 were as follows (dollars in thousands):

	Increase (decrease)
Compensation	$	(188	)	(2.3	)%(1)
Advertising expenses		(103	)	(20.0	)%(2)
Commissions expense		(96	)	(9.7	)%(3)
Legal fees		(90	)	(22.1	)%
Employment recruiting		63		222.2	%
Audit, tax, and accounting fees		98		22.5	%
Outside services		116		28.4	%(4)
Travel expenses		137		22.9	%(5)
Other, net		(8	)	(0.5	)%
	$	(71	)	(0.5	)%

(1) Decrease primarily attributable to the reversal of VI Chip performance-based stock compensation expense (see Note 4 to the Condensed Consolidated Financial Statements) and the disposition of certain Vicor Custom Power subsidiaries, partially offset by annual compensation adjustments in May 2016.

(2) Decrease primarily attributed to decreases in sales support expenses, direct mailings, and advertising in trade publications.

(3) Decrease primarily attributable to the decrease in net revenues subject to commissions.

(4) Increase primarily attributable to an increase in the use of outside consultants at certain international locations.

(5) Increase primarily attributable to increased travel by the Company’s sales and marketing personnel.

-23-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

Research and development expenses were $10,338,000 for the third quarter of 2016, an increase of $217,000, or 2.1%, compared to $10,121,000 for the third quarter of 2015. As a percentage of net revenues, research and development expenses decreased to 19.4% for the third quarter of 2016 from 20.8% for the third quarter of 2015, primarily due to the increase in net revenues.

The components of the $217,000 increase in research and development expenses were as follows (dollars in thousands):

	Increase (decrease)
Project and pre-production materials	$	372		32.7	%(1)
Compensation		194		2.8	%(2)
Computer expenses		37		36.3	%
Facilities expenses		(57	)	(10.5	)%
Depreciation and amortization		(143	)	(23.8	)%(3)
Deferred costs		(206	)	(1118.7	)%(4)
Other, net		20		2.2	%
	$	217		2.1	%

(1) Increase primarily attributable to increases in spending by the BBU and VI Chip segments.

(2) Increase primarily attributable to annual compensation adjustments in May 2016.

(3) Decrease attributable to certain BBU segment fixed assets becoming fully depreciated during 2016.

(4) Decrease primarily attributable to an increase in deferred costs capitalized for certain non-recurring engineering projects for which the related revenues have been deferred.

The significant components of “Other income (expense), net” for the three months ended September 30, and the changes between the periods were as follows (in thousands):

							Increase
	2016			2015			(decrease)
Rental income	$	198		$	—		$	198
Interest income		21			15			6
Credit gains on available-for-sale securities		3			4			(1	)
Gain on disposals of equipment		—			2			(2	)
Foreign currency losses, net		(14	)		(26	)		12
Other, net		3			6			(3	)
	$	211		$	1		$	210

During the second quarter of 2016, we began recognizing rental income under a new leasing agreement with a third party for the former Westcor facility. Our exposure to market risk fluctuations in foreign currency exchange rates relate primarily to the operations of VJCL, for which the functional currency is the Japanese Yen. The functional currency of all other subsidiaries in Europe and Asia is the U.S. Dollar. While our Vicor B.V. operation also potentially exposes us to exchange rate risk, as that subsidiary’s sales are denominated in Euros and Pounds Sterling, any periodic gains or losses associated with exchange rate fluctuations are small, given the small U.S. Dollar value of shipments we make to Vicor B.V.

-24-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

Income before income taxes was $2,484,000 for the third quarter of 2016, as compared to loss before taxes of $(2,217,000) for the third quarter of 2015.

The provision for income taxes and the effective income tax rates for the third quarter of 2016 and the third quarter of 2015 were as follows (dollars in thousands):

	2016			2015
Provision for income taxes	$	133		$	174
Effective income tax rate		5.4	%		7.8	%

Our effective tax rate was lower than the statutory rate in both 2016 and 2015 due to the utilization of net operating losses. The provision for the three months ended September 30, 2016 was primarily due to estimated state taxes in jurisdictions in which we do not have net operating loss carryforwards. No tax benefit could be recognized for the majority of our losses during the period due to a full valuation allowance against all net domestic deferred tax assets. The provision for the three months ended September 30, 2015 was primarily due to estimated federal and state taxes for one noncontrolling interest subsidiary, and for estimated state taxes in jurisdictions in which we do not have net operating loss carryforwards.

In September 2015, Intersil acquired GWS. At that time, our gross investment in non-voting convertible preferred stock of GWS totaled $4,999,719, giving us an approximately 27% ownership interest in GWS. We received cash consideration of $4,999,719 for our investment from Intersil, representing full preference value of our shares of non-voting convertible preferred stock of GWS. Since the investment in GWS had previously been written down to zero, the full amount of the consideration was recorded as a gain from sale of equity method investment in the third quarter of 2015.

Net income per diluted share attributable to Vicor Corporation was $0.06 for the third quarter of 2016 and 2015.

Nine months ended September 30, 2016, compared to nine months ended September 30, 2015

Consolidated net revenues for the nine months ended September 30, 2016 were $152,195,000, a decrease of $16,605,000, or 9.8%, from $168,800,000 for the nine months ended September 30, 2015.

Net revenues, by segment, for the nine months ended September 30, 2016 and the nine months ended September 30, 2015 were as follows (dollars in thousands):

					Increase (decrease)
	2016		2015		$			%
BBU	$	115,963	$	131,396	$	(15,433	)		(11.7	)%
VI Chip		28,958		27,844		1,114			4.0	%
Picor		7,274		9,560		(2,286	)		(23.9	)%
Total	$	152,195	$	168,800	$	(16,605	)		(9.8	)%

The overall decrease in consolidated net revenues for the nine months ended September 30, 2016 from the nine months ended September 30, 2015 was primarily due to an overall 12.8% decrease in bookings for the nine months ended June 30, 2016 compared to the nine months ended June 30, 2015, which included a 12.4% decrease for BBU and a 41.8% decrease for Picor. Customer bookings patterns continue to be unpredictable, particularly with the VI Chip and Picor segments. The decrease in BBU revenues was primarily attributable to a decrease in BBU module and configurable product revenues of approximately $13,054,000 and a decrease in Vicor Custom Power revenues of $3,904,000, due to the consolidation of operations noted above.

-25-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

Gross margin for the nine months ended September 30, 2016 decreased $6,977,000, or 9.1%, to $69,710,000 from $76,687,000 for the nine months ended September 30, 2015. Gross margin as a percentage of net revenues increased to 45.8% for the nine month period ended September 30, 2016 from 45.4% for the nine month period ended September 30, 2015. The lower gross margin dollars is primarily due to the lower net revenues, while the higher gross margin percentage was primarily due to a more favorable product mix and lower charges for inventory and warranty reserves in 2016 compared to 2015.

Selling, general and administrative expenses were $41,643,000 for the nine months ended September 30, 2016, a decrease of $1,688,000, or 3.9%, compared to $43,331,000 for the nine months ended September 30, 2015. Selling, general and administrative expenses as a percentage of net revenues increased to 27.4% for the nine month period ended September 30, 2016 from 25.7% for the nine month period ended September 30, 2015, primarily due to the decreases in net revenues.

The components of the $1,688,000 decrease in selling, general and administrative expenses for the nine months ended September 30, 2016 from the nine months ended September 30, 2015 were as follows (dollars in thousands):

	Increase (decrease)
Compensation	$	(752	)	(2.9	)%(1)
Commissions expense		(581	)	(17.4	)%(2)
Legal fees		(330	)	(21.0	)%(3)
Supplies expense		(166	)	(37.1	)%(4)
Project expenses		(105	)	(71.8	)%
Depreciation and amortization		(58	)	(2.7	)%
Audit, tax, and accounting fees		(51	)	(3.5	)%
Telephone expense		(41	)	(4.7	)%
Travel expenses		231		11.9	%(5)
Outside services		243		18.7	%(6)
Other, net		(78	)	(1.9	)%
	$	(1,688	)	(3.9	)%

(1) Decrease primarily attributable to the reversal of VI Chip performance-based stock compensation expense (see Note 4 to the Condensed Consolidated Financial Statements), the consolidation of Westcor operations, and the disposition of certain Vicor Custom Power subsidiaries, partially offset by annual compensation adjustments in May 2016.

(2) Decrease primarily attributable to the decrease in net revenues subject to commissions.

(3) Decrease attributable to reduced activity associated with the patent infringement claims filed against the Company during the first quarter of 2011 by SynQor. See Note 12 to the Condensed Consolidated Financial Statements.

(4) Decrease primarily attributable to a decrease in spending by the VI Chip segment.

(5) Increase primarily attributable to increased travel by the Company’s sales and marketing personnel.

(6) Increase primarily attributable to an increase in the use of outside consultants by our information systems and technology department, and by certain international locations.

-26-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

Research and development expenses were $31,824,000 for the nine months ended September 30, 2016, an increase of $653,000, or 2.1%, from $31,171,000 for the nine months ended September 30, 2015. As a percentage of net revenues, research and development expenses increased to 20.9% for the nine month period ended September 30, 2016 from 18.5% for the nine month period ended September 30, 2015, primarily due to the lower revenues for the nine months ended September 30, 2016 compared to the nine months ended September 30, 2015.

The components of the $653,000 increase in research and development expenses for the nine months ended September 30, 2016 from the nine months ended September 30, 2015 were as follows (dollars in thousands):

	Increase (decrease)
Project and pre-production materials	$	765		21.6	%(1)
Compensation		496		2.3	%(2)
Set-up and tooling expenses		104		42.4	%(3)
Supplies expense		(74	)	(9.6	)%
Facilities expenses		(178	)	(11.0	)%(4)
Deferred costs		(183	)	(112.1	)%(5)
Depreciation and amortization		(211	)	(11.8	)%(6)
Other, net		(66	)	(3.2	)%
	$	653		2.1	%

(1) Increase primarily attributable to increases in spending by the BBU and VI Chip segments.

(2) Increase primarily attributable to annual compensation adjustments in May 2016.

(3) Increase primarily attributable to an increase in tooling charges associated with the development of VI Chip products.

(4) Decrease primarily attributable to a decrease in utilities and building maintenance expenses.

(5) Decrease primarily attributable to an increase in deferred costs capitalized for certain non-recurring engineering projects for which the related revenues have been deferred.

(6) Decrease attributable to certain BBU segment fixed assets becoming fully depreciated during 2016.

-27-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

The significant components of “Other income (expense), net” for the nine months ended September 30, 2016 and the nine months ended September 30, 2015 and the changes from period to period were as follows (in thousands):

							Increase
	2016			2015			(decrease)
Rental income	$	264		$	—		$	264
Interest income		47			31			16
Foreign currency gains (losses), net		34			(104	)		138
Credit gains on available-for-sale securities		10			12			(2	)
(Loss) gain on disposals of equipment		(4	)		54			(58	)
Other, net		(1	)		18			(19	)
	$	350		$	11		$	339

During the second quarter of 2016, we began recognizing rental income under a new leasing agreement with a third party for the former Westcor facility. Our exposure to market risk for fluctuations in foreign currency exchange rates relates primarily to the operations of VJCL, for which the functional currency is the Japanese Yen. The functional currency of the subsidiaries in Europe and other subsidiaries in Asia is the U.S. Dollar. While our Vicor B.V. operation also potentially exposes us to exchange rate risk, as that subsidiary’s sales are denominated in Euros and Pounds Sterling, any periodic gains or losses associated with exchange rate fluctuations are small, given the small U.S. Dollar value of shipments we make to Vicor B.V.

Income (loss) before income taxes was $(3,407,000) for the nine months ended September 30, 2016 compared to $2,196,000 for the nine months ended September 30, 2015.

The provision for income taxes and the effective income tax rates for the nine months ended September 30, 2016 and the nine months ended September 30, 2015 were as follows (dollars in thousands):

	2016			2015
Provision for income taxes	$	168		$	374
Effective income tax rate		4.9	%		17.0	%

Our effective tax rate was lower than the statutory rate in both 2016 and 2015 due to the utilization of net operating losses. The provision for the nine months ended September 30, 2016 was primarily due to estimated state taxes in jurisdictions in which we do not have net operating loss carryforwards. No tax benefit could be recognized for the majority of our losses during the period due to a full valuation allowance against all net domestic deferred tax assets. In addition, in connection with our acquisition of 100% ownership of certain operating assets and cash of Converpower, the related deferred tax liability for unremitted earnings of $55,000 was reversed and recorded as a discrete benefit in the first quarter of 2016 (see Note 8 to the Condensed Consolidated Financial Statements). The provision for the nine months ended September 30, 2015 was primarily due to estimated federal and state taxes for one noncontrolling interest subsidiary, and for estimated state taxes in jurisdictions in which we do not have net operating loss carryforwards.

In September 2015, Intersil acquired GWS. At that time, our gross investment in non-voting convertible preferred stock of GWS totaled $4,999,719, giving us an approximately 27% ownership interest in GWS. We received cash consideration of $4,999,719 for our investment from Intersil, representing full preference value of our shares of non-voting convertible preferred stock of GWS. Since the investment in GWS had previously been written down to zero, the full amount of the consideration was recorded as a gain from sale of equity method investment in the third quarter of 2015.

Net loss per share attributable to Vicor Corporation was $(0.09) for the nine months ended September 30, 2016, compared to net income per diluted share of $0.17 for the nine months ended September 30, 2015.

-28-

VICOR CORPORATION

Management’s Discussion and Analysis of

Financial Condition and Results of Operation

September 30, 2016

Liquidity and Capital Resources

As of September 30, 2016, we had $55,066,000 in cash and cash equivalents. The ratio of total current assets to total current liabilities was 5.3:1 as of September 30, 2016 and 5.6:1 as of December 31, 2015. Working capital, defined as total current assets less total current liabilities, decreased $3,606,000 to $91,299,000 as of September 30, 2016 from $94,905,000 as of December 31, 2015.

The changes in working capital from December 31, 2015 to September 30, 2016 were as follows (in thousands):

	Increase (decrease)
Cash and cash equivalents	$	(7,914	)
Accounts receivable		2,044
Inventories, net		3,120
Other current assets		(16	)
Accounts payable		(495	)
Accrued compensation and benefits		(300	)
Accrued expenses		390
Accrued severance charges		195
Income taxes payable		8
Deferred revenue		(638	)
	$	(3,606	)

The primary uses of cash for the nine months ended September 30, 2016 was for operating activities of $1,584,000 and the purchase of equipment of $6,368,000.

In November 2000, our Board of Directors authorized the repurchase of up to $30,000,000 of our Common Stock (the “November 2000 Plan”). The November 2000 Plan authorizes us to make such repurchases from time to time in the open market or through privately negotiated transactions. The timing and amounts of Common Stock repurchases are at the discretion of management based on its view of economic and financial market conditions. We did not repurchase shares of Common Stock under the November 2000 Plan during the nine months ended September 30, 2016. As of September 30, 2016, we had approximately $8,541,000 remaining under the November 2000 Plan.

Our primary liquidity needs are for making continuing investments in manufacturing equipment. We believe cash generated from operations and the total of our cash and cash equivalents will be sufficient to fund planned operations and capital equipment purchases for the foreseeable future. We had approximately $596,000 of capital expenditure commitments, principally for manufacturing equipment, as of September 30, 2016.

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Vicor Corporation

September 30, 2016

Item 3 — Quantitative and Qualitative Disclosures About Market Risk

We are exposed to a variety of market risks, including changes in interest rates affecting the return on our cash and cash equivalents and fluctuations in foreign currency exchange rates. As our cash and cash equivalents consist principally of cash accounts and money market securities, which are short-term in nature, we believe our exposure to market risk on interest rate fluctuations for these investments is not significant. As of September 30, 2016, our long-term investment portfolio, recorded on our Condensed Consolidated Balance Sheet as “Long-term investments, net”, consisted of a single auction rate security with a par value of $3,000,000, purchased through and held in custody by a broker-dealer affiliate of Bank of America, N.A., that has experienced failed auctions (the “Failed Auction Security”) since February 2008. While the Failed Auction Security is Aaa/AA+ rated by major credit rating agencies, collateralized by student loans and guaranteed by the U.S. Department of Education under the Federal Family Education Loan Program, continued failure to sell at its periodic auction dates (i.e., reset dates) could negatively impact the carrying value of the investment, in turn leading to impairment charges in future periods. Periodic changes in the fair value of the Failed Auction Security attributable to credit loss (i.e., risk of the issuer’s default) are recorded through earnings as a component of “Other income (expense), net”, with the remainder of any periodic change in fair value not related to credit loss (i.e., temporary “mark-to-market” carrying value adjustments) recorded in “Accumulated other comprehensive (loss) income”, a component of Stockholders’ Equity. Should we conclude a decline in the fair value of the Failed Auction Security is other than temporary, such losses would be recorded through earnings as a component of “Other income (expense), net”. We do not believe there was an “other-than-temporary” decline in value in this security as of September 30, 2016.

Our exposure to market risk for fluctuations in foreign currency exchange rates relates primarily to the operations of VJCL, for which the functional currency is the Japanese Yen, and changes in the relative value of the Yen to the U.S. Dollar. As the functional currency of all other subsidiaries in Europe and other subsidiaries in Asia is the U.S. Dollar, we believe risk to fluctuations in foreign currency exchange rates is not significant, as these operations do not incur material foreign exchange exposures.

Item 4 — Controls and Procedures

(a) Disclosure regarding controls and procedures.

As required by Rule 13a-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), management, with the participation of our Chief Executive Officer (“CEO”) (who is our principal executive officer) and Chief Financial Officer (“CFO”) (who is our principal financial officer), conducted an evaluation of the effectiveness of our disclosure controls and procedures as of the end of the last fiscal quarter (i.e., September 30, 2016). The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the Securities and Exchange Commission’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure information required to be disclosed by a company in the reports it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of September 30, 2016, our CEO and CFO concluded, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

A control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the control system’s objectives will be met. Accordingly, management, including the CEO and CFO, recognizes our disclosure controls or our internal control over financial reporting may not prevent or detect all errors and all fraud. The design of a control system must reflect the fact there are resource constraints, and the benefits of controls must be considered relative to their costs. Further, because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance misstatements due to error or fraud will not occur or that all control issues and instances of fraud, if any, within the Company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of simple error or mistake. Controls can also be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the controls. The design of any system of controls is based in part on certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Projections of any control’s effectiveness to future periods are subject to risks. Over time, controls may become inadequate because of changes in conditions or deterioration in the degree of compliance with policies or procedures.

-30-

Vicor Corporation

September 30, 2016

(b) Changes in internal control over financial reporting.

There was no change in our internal control over financial reporting that occurred during the fiscal quarter ended September 30, 2016, that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

-31-

Vicor Corporation

Part II – Other Information

September  30, 2016

Item 1 — Legal Proceedings

See Note 12. Commitments and Contingencies in the Notes to Condensed Consolidated Financial Statements in Part I, Item 1 – “Financial Statements.”

Item 1A — Risk Factors

There have been no material changes in the risk factors described in Part I, Item 1A – “Risk Factors” of the Company’s Annual Report on Form 10-K for the year ended December 31, 2015.

Item 6 — Exhibits

Exhibit Number	Description
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) of the Exchange Act.
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) of the Exchange Act.
32.1	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	The following material from the Company’s Quarterly Report on Form 10-Q, for the quarter ended September 30, 2016, formatted in XBRL (Extensible Business Reporting Language): (i) the Condensed Consolidated Balance Sheets; (ii) the Condensed Consolidated Statements of Operations; (iii) the Condensed Consolidated Statements of Comprehensive Income (Loss); (iv) the Condensed Consolidated Statements of Cash Flows; and (v) the Notes to Condensed Consolidated Financial Statements.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	VICOR CORPORATION
Date: October 28, 2016	By:	/s/ Patrizio Vinciarelli
		Patrizio Vinciarelli
		Chairman of the Board, President and
		Chief Executive Officer
		(Principal Executive Officer)
Date: October 28, 2016	By:	/s/ James A. Simms
		James A. Simms
		Vice President, Chief Financial Officer
		(Principal Financial Officer)

-33-

EX-31.1

Exhibit 31.1

CHIEF EXECUTIVE OFFICER CERTIFICATION

I, Patrizio Vinciarelli, certify:

1. I have reviewed this quarterly report on Form 10-Q of Vicor Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: October 28, 2016	/s/ Patrizio Vinciarelli
	Patrizio Vinciarelli
	Chief Executive Officer
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CHIEF FINANCIAL OFFICER CERTIFICATION

I, James A. Simms, certify:

1. I have reviewed this quarterly report on Form 10-Q of Vicor Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: October 28, 2016	/s/ James A. Simms
	James A. Simms
	Vice President, Chief Financial Officer
	(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Vicor Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2016 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Patrizio Vinciarelli, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Patrizio Vinciarelli

Patrizio Vinciarelli

President, Chairman of the Board and

Chief Executive Officer

October 28, 2016

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Vicor Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2016 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, James A. Simms, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ James A. Simms

James A. Simms

Vice President, Chief Financial Officer

October 28, 2016

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 21, 2016
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Trading Symbol	VICR
Entity Registrant Name	VICOR CORP
Entity Central Index Key	0000751978
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		27,097,656
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,758,218

XML

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 55,066	$ 62,980
Accounts receivable, less allowance of $154 in 2016 and $171 in 2015	28,026	25,982
Inventories, net	26,562	23,442
Other current assets	3,086	3,102
Total current assets	112,740	115,506
Long-term deferred tax assets, net	11	15
Long-term investments, net	2,580	2,866
Property, plant and equipment, net	37,535	37,450
Other assets	2,172	1,708
Total assets	155,038	157,545
Current liabilities:
Accounts payable	7,965	7,470
Accrued compensation and benefits	8,649	8,349
Accrued expenses	2,178	2,568
Accrued severance charges	0	195
Income taxes payable	23	31
Deferred revenue	2,626	1,988
Total current liabilities	21,441	20,601
Long-term deferred revenue	392	468
Contingent consideration obligations	288	144
Long-term income taxes payable	182	192
Deferred income taxes payable		55
Total liabilities	22,303	21,460
Commitments and contingencies (Note 12)
Vicor Corporation stockholders' equity:
Common Stock	396	395
Additional paid-in capital	174,881	174,337
Retained earnings	96,126	99,685
Accumulated other comprehensive loss	(96)	(577)
Treasury stock, at cost	(138,927)	(138,927)
Total Vicor Corporation stockholders' equity	132,498	135,031
Noncontrolling interest	237	1,054
Total equity	132,735	136,085
Total liabilities and equity	155,038	157,545
Class B Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	$ 118	$ 118

XML

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 154	$ 171

XML

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net revenues	$ 53,227	$ 48,664	$ 152,195	$ 168,800
Cost of revenues	27,304	27,378	82,485	92,113
Gross margin	25,923	21,286	69,710	76,687
Operating expenses:
Selling, general and administrative	13,312	13,383	41,643	43,331
Research and development	10,338	10,121	31,824	31,171
Total operating expenses	23,650	23,504	73,467	74,502
Income (loss) from operations	2,273	(2,218)	(3,757)	2,185
Other income (expense), net:
Total unrealized gains on available-for-sale securities, net	1	15	54	54
Portion of losses (gains) recognized in other comprehensive income (loss)	2	(11)	(44)	(42)
Net credit gains recognized in earnings	3	4	10	12
Other income (expense), net	208	(3)	340	(1)
Total other income (expense), net	211	1	350	11
Income (loss) before income taxes	2,484	(2,217)	(3,407)	2,196
Less: Provision for income taxes	133	174	168	374
Gain from sale of equity method investment, net of tax		5,000		5,000
Consolidated net income (loss)	2,351	2,609	(3,575)	6,822
Less: Net income (loss) attributable to noncontrolling interest	15	106	(16)	143
Net income (loss) attributable to Vicor Corporation	$ 2,336	$ 2,503	$ (3,559)	$ 6,679
Net income (loss) per common share attributable to Vicor Corporation:
Basic	$ 0.06	$ 0.06	$ (0.09)	$ 0.17
Diluted	$ 0.06	$ 0.06	$ (0.09)	$ 0.17
Shares used to compute net income (loss) per common share attributable to Vicor Corporation:
Basic	38,837	38,786	38,811	38,742
Diluted	39,184	39,086	38,811	39,176

XML

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss)		$ 2,351	$ 2,609	$ (3,575)	$ 6,822
Foreign currency translation gains (losses), net of tax	[1]	56	61	473	(36)
Unrealized (losses) gains on available-for-sale securities, net of tax	[2]	(2)	11	44	45
Other comprehensive income		54	72	517	9
Consolidated comprehensive income (loss)		2,405	2,681	(3,058)	6,831
Less: Comprehensive income (loss) attributable to noncontrolling interest		19	110	20	142
Comprehensive income (loss) attributable to Vicor Corporation		$ 2,386	$ 2,571	$ (3,078)	$ 6,689

[1] Net of tax provision (benefit) of $0 for the three and nine months ended September 30, 2016 and 2015.

[2] The deferred tax assets associated with cumulative unrealized losses on available-for-sale securities are completely offset by a tax valuation allowance as of September 30, 2016 and 2015. Therefore, there is no net income tax provision (benefit) recognized for the three and nine months ended September 30, 2016 and 2015.

XML

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Foreign currency translation gains (losses), tax provision (benefit)	$ 0	$ 0	$ 0	$ 0
Recognized income tax provision (benefit)	$ 0	$ 0	$ 0	$ 0

XML

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities:
Consolidated net income (loss)	$ (3,575)	$ 6,822
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used for) operating activities:
Depreciation and amortization	6,384	6,954
Gain from sale of equity method investment		(5,000)
Stock-based compensation expense, net	171	1,392
Increase in other assets	(505)
Decrease in long-term deferred revenue	(76)	(103)
Deferred income taxes	(51)
Benefit for doubtful accounts	(22)	(18)
Loss (gain) on disposal of equipment	4	(54)
Credit gain on available-for-sale securities	(10)	(12)
(Decrease) increase in long-term income taxes payable	(10)	8
Change in current assets and liabilities, net	(3,894)	2,959
Net cash (used for) provided by operating activities	(1,584)	12,948
Investing activities:
Additions to property, plant and equipment	(6,368)	(5,596)
Proceeds from sale of equity method investment		5,000
Sales and maturities of investments		360
Proceeds from sale of equipment	2	54
Increase in other assets	(18)	(156)
Net cash used for investing activities	(6,384)	(338)
Financing activities:
Proceeds from issuance of Common Stock	455	781
Payment of contingent consideration obligations	(64)
Acquisition of noncontrolling interest	(372)
Net cash provided by financing activities	19	781
Effect of foreign exchange rates on cash	35	(7)
Net (decrease) increase in cash and cash equivalents	(7,914)	13,384
Cash and cash equivalents at beginning of period	62,980	55,187
Cash and cash equivalents at end of period	$ 55,066	$ 68,571

XML

Basis of Presentation

9 Months Ended

Sep. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

1. Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements of Vicor Corporation and its consolidated subsidiaries (collectively, the “Company”) have been prepared in accordance with generally accepted accounting principles for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, these interim financial statements do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2016 are not necessarily indicative of the results that may be expected for any other interim period or the year ending December 31, 2016. The balance sheet at December 31, 2015 presented herein has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 filed by the Company with the Securities and Exchange Commission on March 8, 2016.

XML

Long-Term Investments

9 Months Ended

Sep. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Long-Term Investments

2. Long-Term Investments

As of September 30, 2016 and December 31, 2015, the Company held one auction rate security that had experienced failed auctions of $3,000,000 at par value, which was purchased through and is held by a broker-dealer affiliate of Bank of America, N.A. (the “Failed Auction Security”). The Failed Auction Security held by the Company is Aaa/AA+ rated by major credit rating agencies, collateralized by student loans, and guaranteed by the U.S. Department of Education under the Federal Family Education Loan Program. Management is not aware of any reason to believe the issuer of the Failed Auction Security is presently at risk of default. Through September 30, 2016, the Company has continued to receive interest payments on the Failed Auction Security in accordance with the terms of its indenture. Management believes the Company ultimately should be able to liquidate the Failed Auction Security without significant loss primarily due to the overall quality of the issue held and the collateral securing the substantial majority of the underlying obligation. However, current conditions in the auction rate securities market have led management to conclude the recovery period for the Failed Auction Security exceeds 12 months. As a result, the Company continued to classify the Failed Auction Security as long-term as of September 30, 2016.

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

September 30, 2016	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Failed Auction Security	$	3,000	$	—	$	420	$	2,580

December 31, 2015	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Failed Auction Security	$	3,000	$	—	$	474	$	2,526
Brokered certificates of deposit		340		—		—		340
	$	3,340	$	—	$	474	$	2,866

As of September 30, 2016, 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 Failed Auction Security on September 30, 2016, by contractual maturity, is shown below (in thousands):

	Cost		Estimated Fair Value
Due in twenty-six years	$	3,000	$	2,580

Based on the fair value measurements described in Note 3, the fair value of the Failed Auction Security on September 30, 2016, with a par value of $3,000,000, was estimated by the Company to be approximately $2,580,000. The gross unrealized loss of $420,000 on the Failed Auction Security consists of two types of estimated loss: an aggregate credit loss of $62,000 and an aggregate temporary impairment of $358,000. In determining the amount of credit loss, the Company compared the present value of cash flows expected to be collected to the amortized cost basis of the security, considering credit default risk probabilities and changes in credit ratings as significant inputs, among other factors (See Note 3).

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

	2016			2015
Balance at the beginning of the period	$	72		$	84
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized		(10	)		(12	)
Balance at the end of the period	$	62		$	72

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

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

XML

Fair Value Measurements

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

3. 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 measured at fair value on a recurring basis included the following as of September 30, 2016 (in thousands):

	Using
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value as of September 30, 2016
Cash equivalents:
Money market funds	$	9,989	$	—	$	—		$	9,989
Long-term investments:
Failed Auction Security		—		—		2,580			2,580
Liabilities:
Contingent consideration obligations		—		—		(288	)		(288	)

Assets measured at fair value on a recurring basis included the following as of December 31, 2015 (in thousands):

	Using
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value as of December 31, 2015
Cash equivalents:
Money market funds	$	10,412	$	—	$	—		$	10,412
Long-term investments:
Failed Auction Security		—		—		2,526			2,526
Brokered certificates of deposit		—		340		—			340
Liabilities:
Contingent consideration obligation		—		—		(144	)		(144	)

The Company has classified its contingent consideration obligations as Level 3 because the fair value for these liabilities was determined using unobservable inputs. The liabilities were based on estimated sales of legacy products over the period of royalty payments at the royalty rate (see Note 8), discounted using the Company’s estimated cost of capital.

The Company has classified its brokered certificates of deposit as Level 2 because the fair value for these investments was determined utilizing observable inputs from non-active markets. The fair values fluctuate with changes in market interest rates obtained from information available in publicly quoted markets. Management tested the reported fair values by comparing them to net present value calculations utilizing a discount rate based on U.S. Treasury bill and bond yields for similar maturities.

As of September 30, 2016, there was insufficient observable auction rate security market information available to determine the fair value of the Failed Auction Security using Level 1 or Level 2 inputs. As such, the Company’s investment in the Failed Auction Security was deemed to require valuation using Level 3 inputs. Management, after consulting with advisors, valued the Failed Auction Security using analyses and pricing models similar to those used by market participants (i.e., buyers, sellers, and the broker-dealers responsible for execution of the Dutch auction pricing mechanism by which each issue’s interest rate was set). Management utilized a probability weighted discounted cash flow (“DCF”) model to determine the estimated fair value of this security as of September 30, 2016. The major assumptions used in preparing the DCF model included: estimates for the amount and timing of future interest and principal payments based on default probability assumptions used to measure the credit loss of 2.1%; the rate of return required by investors to own this type of security in the current environment, which management estimates to be 5.0% above the risk free rate of return; and an estimated timeframe of three to five years for successful auctions for this type of security to occur. In making these assumptions, management considered relevant factors including: the formula applicable to the security defining the interest rate paid to investors in the event of a failed auction (the “Penalty Rate”); forward projections of the interest rate benchmarks specified in such formulas; the likely timing of principal repayments; the probability of full repayment considering the guarantees by the U.S. Department of Education of the underlying student loans, guarantees by other third parties, and additional credit enhancements provided through other means; and publicly available pricing data for recently issued student loan asset-backed securities not subject to auctions. In developing its estimate of the rate of return required by investors to own the security, management compared the Penalty Rate of the Failed Auction Security with yields of actively traded long-term bonds with similar characteristics and, reflecting the limited liquidity for auction rate securities and the discounts to par value seen in recent tender offers by issuers and arm’s length market transactions between informed buyers and sellers, estimated the implied yield (i.e., the discount to par value) necessary to complete a sale of the Failed Auction Security. Management has calculated an increase or decrease in the liquidity risk premium of 5.0% referenced above of 1.0% (i.e., 100 basis points) as used in the model, would decrease or increase, respectively, the fair value of the Failed Auction Security by approximately $100,000.

For purposes of the valuation process for the Failed Auction Security, “management” consists of senior members of the Company’s finance department. The fair value measurements for the Failed Auction Security are reviewed and updated on a quarterly basis. The calculations are prepared by the Company’s Corporate Controller, in conjunction with information provided by its valuation advisors, and include the development and substantiation of the unobservable inputs. The methodology, assumptions, and calculations are reviewed and approved by the Company’s Chief Financial Officer and Chief Accounting Officer.

The significant unobservable inputs used in the fair value measurement of the Failed Auction Security are the cumulative probability of earning the maximum rate until maturity, the cumulative probability of principal return prior to maturity, the cumulative probability of default, the liquidity risk premium, and the recovery rate in default. Significant increases (decreases) in any of those inputs in isolation would result in changes in fair value measurement. Significant increases (decreases) in the cumulative probability of earning the maximum rate until maturity, the cumulative probability of principal return prior to maturity, and the recovery rate in default would result in a higher (lower) fair value measurement, while increases (decreases) in the cumulative probability of default and the liquidity risk premium would result in a lower (higher) fair value measurement.

Generally, the interrelationships are such that a change in the assumption used for the cumulative probability of principal return prior to maturity is accompanied by a directionally similar change in the assumption used for the cumulative probability of earning the maximum rate until maturity and a directionally opposite change in the assumptions used for the cumulative probability of default and the liquidity risk premium. The recovery rate in default is somewhat independent and based upon the security’s specific underlying assets and published recovery rate indices.

Quantitative information about Level 3 fair value measurements as of September 30, 2016 is as follows (dollars in thousands):

	Fair Value		Valuation Technique		Unobservable Input	Weighted Average
Failed Auction Security	$	2,580		Discounted cash flow	Cumulative probability of earning the maximum rate until maturity		0.03	%
					Cumulative probability of principal return prior to maturity		94.82	%
					Cumulative probability of default		5.15	%
					Liquidity risk premium		5.00	%
					Recovery rate in default		40.00	%

The change in the estimated fair value calculated for the investment valued on a recurring basis utilizing Level 3 inputs (i.e., the Failed Auction Security) for the nine months ended September 30, 2016 was as follows (in thousands):

Balance at the beginning of the period	$	2,526
Credit gain on available-for-sale securities included in Other income (expense), net		10
Gain included in Other comprehensive income (loss)		44
Balance at the end of the period	$	2,580

The change in the estimated fair value calculated for the liabilities valued on a recurring basis utilizing Level 3 inputs (i.e., the Contingent consideration obligations) for the nine months ended September 30, 2016 was as follows (in thousands):

Balance at the beginning of the period	$	144
Obligation incurred upon acquisition of noncontrolling interest (see Note 8)		208
Payments		(64	)
Balance at the end of the period	$	288

There were no transfers between Level 1 and Level 2 of the fair value hierarchy during the nine months ended September 30, 2016.

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2016

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

Stock-Based Compensation

4. Stock-Based Compensation

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards as of their grant date. Stock-based compensation expense, net for the three and nine months ended September 30 was as follows (in thousands):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2016			2015		2016			2015
Cost of revenues	$	(47	)	$	51	$	59		$	170
Selling, general and administrative		(327	)		215		148			975
Research and development		(124	)		75		(36	)		247
Total stock-based compensation	$	(498	)	$	341	$	171		$	1,392

On December 31, 2010, the Company granted 2,984,250 non-qualified stock options under the VI Chip 2007 Stock Option and Incentive Plan with performance-based vesting provisions tied to achievement of certain margin targets by VI Chip Corporation. As of December 31, 2010, the Company determined it was probable the margin targets could be achieved and, accordingly, began recording stock-based compensation expense relating to these options beginning January 1, 2011. During the third quarter of 2016, the Company determined the margin targets would not be met prior to the expiration date of the corresponding options, as VI Chip’s revenue growth has been below levels necessary to achieve the targets. As a result, in accordance with the accounting guidance for performance-based stock options, the Company reversed approximately $768,000 of previously recorded stock-based compensation expense in the third quarter of 2016, representing all expense taken for these performance-based options through June 30, 2016. This resulted in decreases in cost of revenues of $86,000, selling, general and administrative expense of $516,000, and research and development expense of $166,000 for the three and nine months ended September 30, 2016.

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Net Income (Loss) per Share

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Net Income (Loss) per Share

5. Net Income (Loss) per Share

The following table sets forth the computation of basic and diluted net income (loss) per share for the three and nine months ended September 30 (in thousands, except per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016			2015
Numerator:
Net income (loss) attributable to Vicor Corporation	$	2,336	$	2,503	$	(3,559	)	$	6,679
Denominator:
Denominator for basic net income (loss) per share-weighted average shares (1)		38,837		38,786		38,811			38,742
Effect of dilutive securities:
Employee stock options (2)		347		300		—			434
Denominator for diluted net income (loss) per share – adjusted weighted-average shares and assumed conversions		39,184		39,086		38,811			39,176
Basic net income (loss) per share	$	0.06	$	0.06	$	(0.09	)	$	0.17
Diluted net income (loss) per share	$	0.06	$	0.06	$	(0.09	)	$	0.17

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

(2) Options to purchase 449,464 and 1,845,289 shares of Common Stock for the three and nine months ended September 30, 2016, respectively, were not included in the calculation of net income (loss) per share as the effect would have been antidilutive. Options to purchase 533,689 and 141,971 shares of Common Stock for the three and nine months ended September 30, 2015, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.

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Inventories

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

Inventories

6. Inventories

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

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

Inventories were as follows (in thousands):

	September 30, 2016		December 31, 2015
Raw materials	$	19,652	$	16,257
Work-in-process		2,991		2,879
Finished goods		3,919		4,306
Net balance	$	26,562	$	23,442

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Other Investments

9 Months Ended

Sep. 30, 2016

Text Block [Abstract]

Other Investments

7. Other Investments

In September 2015, Intersil Corporation (“Intersil”) acquired Great Wall Semiconductor Corporation (“GWS”). At that time, the Company’s gross investment in non-voting convertible preferred stock of GWS totaled $4,999,719, giving the Company an approximately 27% ownership interest in GWS. The Company received cash consideration of $4,999,719 for its investment from Intersil, representing full preference value of its shares of non-voting convertible preferred stock of GWS. Since the investment in GWS had previously been written down to zero, the full amount of the consideration was recorded as a gain from sale of equity method investment in the third quarter of 2015.

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Noncontrolling Interest Transactions

9 Months Ended

Sep. 30, 2016

Noncontrolling Interest [Abstract]

Noncontrolling Interest Transactions

8. Noncontrolling Interest Transactions

On March 30, 2016, the Company acquired 100% ownership of certain operating assets and cash of its consolidated subsidiary, Converpower Corporation (“Converpower”), in which it held a 49% ownership interest. The operating assets and cash were acquired in exchange for the Company’s common shares representing that 49% interest and the aggregate dollar amount of royalty payments to be made by the Company to Converpower. The transaction was executed through a newly-formed, wholly-owned subsidiary, Granite Power Technologies, Inc. (“GPT”), the business operations of which had formerly existed as a division of Vicor Corporation. The shares of Converpower common stock held by the Company were contributed to GPT prior to the transaction. At the same time that it entered into the Asset Purchase Agreement associated with this transaction, the Company and Converpower entered into a license agreement providing the Company the right to continue manufacturing certain Converpower products in exchange for payment of royalties, quarterly through June 30, 2021, equal to a percentage of the revenue generated by the manufacture and sale of these products by GPT. The estimated present value of total future royalties, included in “Contingent consideration obligations” in the accompanying Condensed Consolidated Balance Sheet as of September 30, 2016, is $185,000 (initially $208,000, as of March 31, 2016). Although the Company exchanged its shares representing its 49% equity interest in Converpower, it acquired 100% control of the business operations. Accordingly, this transaction was accounted for as an acquisition of a noncontrolling interest (i.e., an equity transaction). As such, the noncontrolling interest balance in equity associated with Converpower was reduced to zero, and the additional paid-in capital account was reduced by $208,000, the estimated present value of total future royalties as of March 31, 2016. As a result of the transactions associated with the consolidation of the Converpower operation into GPT, the Company’s aggregate balance of cash, short-term interest receivable, and long-term investments on its Condensed Consolidated Balance Sheet as of March 31, 2016, declined by approximately $718,000. No amounts were recorded in the Condensed Consolidated Statement of Operations related to these transactions.

The respective noncontrolling interest holders of Converpower served as key employees of Converpower prior to the transactions described above.

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Severance and Other Charges

9 Months Ended

Sep. 30, 2016

Restructuring and Related Activities [Abstract]

Severance and Other Charges

9. Severance and Other Charges

A summary of the activity related to the accrued severance charges is as follows (in thousands):

Balance as of December 31, 2015	$	195
Payments		(195	)
Balance as of September 30, 2016	$	—

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Product Warranties

9 Months Ended

Sep. 30, 2016

Guarantees [Abstract]

Product Warranties

10. Product Warranties

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

Product warranty activity for the three and nine months ended September 30 was as follows (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Balance at the beginning of the period	$	496		$	332		$	584		$	204
Accruals for warranties for products sold in the period		61			280			291			465
Fulfillment of warranty obligations		(106	)		(18	)		(374	)		(75	)
Revisions of estimated obligations		(109	)		—			(159	)		—
Balance at the end of the period	$	342		$	594		$	342		$	594

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Income Taxes

9 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

Income Taxes

11. Income Taxes

The tax provision is based on the estimated annual effective tax rate for the year, which includes estimated federal, state and foreign income taxes on the Company’s projected pre-tax income (loss) and, in 2015, for estimated federal and state income taxes for certain noncontrolling interest subsidiaries that were not part of the Company’s consolidated income tax returns.

The provisions for income taxes and the effective income tax rates for the three and nine months ended September 30 were as follows (dollars in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Provision for income taxes	$	133		$	174		$	168		$	374
Effective income tax rate		5.4	%		7.8	%		4.9	%		17.0	%

The Company’s effective tax rate was lower than the statutory tax rate in each 2016 and 2015 period due to the utilization of net operating losses. The provisions for the three and nine months ended September 30, 2016 were primarily due to estimated state taxes in jurisdictions in which the Company does not have net operating loss carryforwards. No tax benefit could be recognized for the majority of the Company’s losses during the periods due to a full valuation allowance against all net domestic deferred tax assets. In addition, in connection with the Company’s acquisition of 100% ownership of certain operating assets and cash of Converpower, the related deferred tax liability for unremitted earnings of $55,000 was reversed and recorded as a discrete benefit in the first quarter of 2016 (see Note 8). The provisions for the three and nine months ended September 30, 2015 were primarily due to estimated federal and state taxes for one noncontrolling interest subsidiary, and for estimated state taxes in jurisdictions in which the Company does not have net operating loss carryforwards.

As of September 30, 2016, the Company continues to maintain a valuation allowance of approximately $25,855,000 against all domestic net deferred tax assets and the majority of foreign net deferred tax assets, for which realization cannot be considered more likely than not at this time.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

12. Commitments and Contingencies

At September 30, 2016, the Company had approximately $596,000 of capital expenditure commitments.

On January 28, 2011, SynQor, Inc. (“SynQor”) filed a complaint for patent infringement against Ericsson, Inc. (“Ericsson”), Cisco Systems, Inc. (“Cisco”) and the Company in the U.S. District Court for the Eastern District of Texas (the “Texas Action”). Ericsson and Cisco subsequently settled with SynQor and are no longer parties to the Texas Action. With respect to the Company, SynQor’s complaint in the Texas Action alleged 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, and 7,564,702 (“the ‘190 patent”, “the ‘021 patent” and “the ‘702 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. On September 20, 2011, SynQor filed an amended complaint in the Texas Action that further alleged 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 number 8,023,290 (“the ‘290 patent”). The Company responded to SynQor’s amended complaint in the Texas Action by denying that it infringes any of the SynQor patents, and asserting that the SynQor patents are invalid. The Company has further alleged that the SynQor ‘290 patent is unenforceable due to inequitable conduct by SynQor or its agents during the examination of the ‘290 patent at the United States Patent and Trademark Office (“USPTO”). The Company has also asserted counterclaims seeking damages against SynQor for deceptive trade practices and tortious interference with prospective economic advantage arising from SynQor’s attempted enforcement of its patents against the Company.

The Company has initiated administrative review proceedings at the USPTO challenging the validity of certain claims of the SynQor patents asserted in the Texas Action, including all claims that were asserted against the Company by SynQor. Regarding the ‘190 patent, the Patent Trial and Appeal Board (“PTAB”) of the USPTO issued a decision upholding the validity of the ‘190 patent claims. That decision was appealed by the Company to the United States Court of Appeals for the Federal Circuit (“the Federal Circuit”), which issued a decision on March 13, 2015 reversing the PTAB, determining that certain claims were invalid, and remanding the matter to the PTAB for further proceedings. On May 2, 2016, the PTAB issued a decision determining that all but one of the remaining claims of the ‘190 patent were invalid and remanding the remaining claim to a patent examiner for further examination. In addition, on that date, the PTAB issued decisions finding all challenged claims of SynQor’s ‘021 patent invalid and upholding the validity of all challenged claims of SynQor’s ‘702 and ‘290 patents. The Company has filed an appeal with the Federal Circuit from the PTAB’s decision upholding the validity of the challenged claims of the ‘702 and ‘290 patents. SynQor has filed an appeal with the Federal Circuit from the PTAB’s decision that the challenged claims of the ‘021 patent are invalid. Decisions in these appeals are not expected until 2017. On May 23, 2016, the Texas Court issued an order staying the Texas Action until the completion of all of the administrative review proceedings concerning the asserted SynQor patents, including any appeals from such proceedings to the Federal Circuit.

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, including such use by Cisco. The Company believes SynQor’s claims lack merit and, therefore, continues to vigorously defend itself against SynQor’s patent infringement allegations. The Company does not believe a loss is probable for this matter. If a loss were to be incurred, however, the Company cannot estimate the amount of possible loss or range of possible loss at this time.

In addition to the SynQor matter, the Company is involved in certain other litigation and claims incidental to the conduct of its business. While the outcome of lawsuits and claims against the Company cannot be predicted with certainty, management does not expect any current litigation or claims to have a material adverse impact on the Company’s financial position or results of operations.

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Segment Information

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Segment Information

13. Segment Information

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

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

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

	BBU		VI Chip			Picor			Corporate			Eliminations (1)			Total
2016:
Net revenues	$	38,518	$	11,961		$	5,320		$	—		$	(2,572	)	$	53,227
Income (loss) from operations		3,734		(1,915	)		627			(173	)		—			2,273
Total assets		193,115		21,453			6,928			72,521			(138,979	)		155,038
Depreciation and amortization		1,025		531			142			375			—			2,073
2015:
Net revenues	$	41,119	$	6,023		$	2,791		$	—		$	(1,269	)	$	48,664
Income (loss) from operations		5,612		(6,564	)		(1,169	)		(97	)		—			(2,218	)
Total assets		163,801		15,372			4,796			88,142			(108,836	)		163,275
Depreciation and amortization		1,119		633			123			356			—			2,231

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

	BBU		VI Chip			Picor			Corporate			Eliminations (1)			Total
2016:
Net revenues	$	115,963	$	30,126		$	12,596		$	—		$	(6,490	)	$	152,195
Income (loss) from operations		9,475		(12,131	)		(510	)		(591	)		—			(3,757	)
Total assets		193,115		21,453			6,928			72,521			(138,979	)		155,038
Depreciation and amortization		3,293		1,660			404			1,027			—			6,384
2015:
Net revenues	$	131,396	$	28,939		$	13,870		$	—		$	(5,405	)	$	168,800
Income (loss) from operations		17,618		(15,336	)		474			(571	)		—			2,185
Total assets		163,801		15,372			4,796			88,142			(108,836	)		163,275
Depreciation and amortization		3,424		2,150			318			1,062			—			6,954

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

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Impact of Recently Issued Accounting Standards

9 Months Ended

Sep. 30, 2016

Accounting Changes and Error Corrections [Abstract]

Impact of Recently Issued Accounting Standards

14. Impact of Recently Issued Accounting Standards

In August 2016, the Financial Accounting Standards Board (“FASB”) issued guidance to clarify how certain cash receipts and cash payments should be presented in the statement of cash flows. These include debt prepayment, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, distributions received from equity method investees and beneficial interests in securitization transactions. The new guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. The Company has not yet determined the impact this new guidance will have on its consolidated financial statements and related disclosures.

In March 2016, the FASB issued new guidance for employee share-based payment accounting, which makes several modifications to existing guidance related to the accounting for forfeitures, employer tax withholding on share-based compensation and the financial statement presentation of excess tax benefits or deficiencies. This new guidance also clarifies the statement of cash flows presentation for certain components of share-based awards. The standard is effective for interim and annual reporting periods beginning after December 15, 2016, with early adoption permitted. The Company has not yet determined the impact this new guidance will have on its consolidated financial statements and related disclosures.

In February 2016, the FASB issued new guidance for lease accounting, which will require lessees to recognize all leases with a duration of greater than twelve months on the balance sheet. For lessors, the guidance modifies the classification criteria and accounting for sales-type and direct financing leases. The new standard is effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted. The Company has not yet determined the impact this new guidance will have on its consolidated financial statements and related disclosures.

In July 2015, the FASB issued new guidance for inventory accounting, which will require companies to measure in scope inventory at the lower of cost or net realizable value. Current guidance requires an entity to measure inventory at the lower of cost or market. The new guidance does not apply to inventory that is measured using last-in, first-out (“LIFO”) or retail inventory methods. The guidance applies to all other inventory, which includes inventory that is measured using first-in, first-out (“FIFO”), which the Company employs, or average cost methods. The new guidance will be effective for the Company on January 1, 2017, and is to be applied prospectively with earlier application permitted as of the beginning of an interim or annual reporting period. The Company does not anticipate the new guidance will have a material impact on its consolidated financial statements and related disclosures.

In May 2014, the FASB issued new guidance for revenue recognition, which will require an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The new guidance will replace most existing revenue recognition guidance in U.S. Generally Accepted Accounting Principles when it becomes effective which, for the Company, will now be on January 1, 2018, as on July 9, 2015, the FASB voted to defer the effective date of the new standard by one year. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect the new guidance will have on its consolidated financial statements and related disclosures. While the Company has begun its assessment of the new standard and plans to utilize the cumulative effect transition method, it has not yet determined the effect the standard will have on its ongoing financial reporting.

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Long-Term Investments (Tables)

9 Months Ended

Sep. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-Sale Securities

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

September 30, 2016	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Failed Auction Security	$	3,000	$	—	$	420	$	2,580

December 31, 2015	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Failed Auction Security	$	3,000	$	—	$	474	$	2,526
Brokered certificates of deposit		340		—		—		340
	$	3,340	$	—	$	474	$	2,866

Amortized Cost and Estimated Fair Value of Failed Auction Securities by Contractual Maturities

The amortized cost and estimated fair value of the Failed Auction Security on September 30, 2016, by contractual maturity, is shown below (in thousands):

	Cost		Estimated Fair Value
Due in twenty-six years	$	3,000	$	2,580

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

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

	2016			2015
Balance at the beginning of the period	$	72		$	84
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized		(10	)		(12	)
Balance at the end of the period	$	62		$	72

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets measured at fair value on a recurring basis included the following as of September 30, 2016 (in thousands):

	Using
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value as of September 30, 2016
Cash equivalents:
Money market funds	$	9,989	$	—	$	—		$	9,989
Long-term investments:
Failed Auction Security		—		—		2,580			2,580
Liabilities:
Contingent consideration obligations		—		—		(288	)		(288	)

Assets measured at fair value on a recurring basis included the following as of December 31, 2015 (in thousands):

	Using
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value as of December 31, 2015
Cash equivalents:
Money market funds	$	10,412	$	—	$	—		$	10,412
Long-term investments:
Failed Auction Security		—		—		2,526			2,526
Brokered certificates of deposit		—		340		—			340
Liabilities:
Contingent consideration obligation		—		—		(144	)		(144	)

Quantitative Information about Level 3 Fair Value Measurements

Quantitative information about Level 3 fair value measurements as of September 30, 2016 is as follows (dollars in thousands):

	Fair Value		Valuation Technique		Unobservable Input	Weighted Average
Failed Auction Security	$	2,580		Discounted cash flow	Cumulative probability of earning the maximum rate until maturity		0.03	%
					Cumulative probability of principal return prior to maturity		94.82	%
					Cumulative probability of default		5.15	%
					Liquidity risk premium		5.00	%
					Recovery rate in default		40.00	%

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

The change in the estimated fair value calculated for the investment valued on a recurring basis utilizing Level 3 inputs (i.e., the Failed Auction Security) for the nine months ended September 30, 2016 was as follows (in thousands):

Balance at the beginning of the period	$	2,526
Credit gain on available-for-sale securities included in Other income (expense), net		10
Gain included in Other comprehensive income (loss)		44
Balance at the end of the period	$	2,580

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

The change in the estimated fair value calculated for the liabilities valued on a recurring basis utilizing Level 3 inputs (i.e., the Contingent consideration obligations) for the nine months ended September 30, 2016 was as follows (in thousands):

Balance at the beginning of the period	$	144
Obligation incurred upon acquisition of noncontrolling interest (see Note 8)		208
Payments		(64	)
Balance at the end of the period	$	288

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

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

Stock-Based Compensation Expense

Stock-based compensation expense, net for the three and nine months ended September 30 was as follows (in thousands):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2016			2015		2016			2015
Cost of revenues	$	(47	)	$	51	$	59		$	170
Selling, general and administrative		(327	)		215		148			975
Research and development		(124	)		75		(36	)		247
Total stock-based compensation	$	(498	)	$	341	$	171		$	1,392

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Net Income (Loss) per Share (Tables)

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

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

The following table sets forth the computation of basic and diluted net income (loss) per share for the three and nine months ended September 30 (in thousands, except per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016			2015
Numerator:
Net income (loss) attributable to Vicor Corporation	$	2,336	$	2,503	$	(3,559	)	$	6,679
Denominator:
Denominator for basic net income (loss) per share-weighted average shares (1)		38,837		38,786		38,811			38,742
Effect of dilutive securities:
Employee stock options (2)		347		300		—			434
Denominator for diluted net income (loss) per share – adjusted weighted-average shares and assumed conversions		39,184		39,086		38,811			39,176
Basic net income (loss) per share	$	0.06	$	0.06	$	(0.09	)	$	0.17
Diluted net income (loss) per share	$	0.06	$	0.06	$	(0.09	)	$	0.17

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

(2) Options to purchase 449,464 and 1,845,289 shares of Common Stock for the three and nine months ended September 30, 2016, respectively, were not included in the calculation of net income (loss) per share as the effect would have been antidilutive. Options to purchase 533,689 and 141,971 shares of Common Stock for the three and nine months ended September 30, 2015, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.

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Inventories (Tables)

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories were as follows (in thousands):

	September 30, 2016		December 31, 2015
Raw materials	$	19,652	$	16,257
Work-in-process		2,991		2,879
Finished goods		3,919		4,306
Net balance	$	26,562	$	23,442

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Severance and Other Charges (Tables)

9 Months Ended

Sep. 30, 2016

Restructuring and Related Activities [Abstract]

Summary of Activity Related to Accrued Severance Charges

A summary of the activity related to the accrued severance charges is as follows (in thousands):

Balance as of December 31, 2015	$	195
Payments		(195	)
Balance as of September 30, 2016	$	—

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Product Warranties (Tables)

9 Months Ended

Sep. 30, 2016

Guarantees [Abstract]

Product Warranty Activity

Product warranty activity for the three and nine months ended September 30 was as follows (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Balance at the beginning of the period	$	496		$	332		$	584		$	204
Accruals for warranties for products sold in the period		61			280			291			465
Fulfillment of warranty obligations		(106	)		(18	)		(374	)		(75	)
Revisions of estimated obligations		(109	)		—			(159	)		—
Balance at the end of the period	$	342		$	594		$	342		$	594

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

Provisions for Income Taxes and Effective Income Tax Rates

The provisions for income taxes and the effective income tax rates for the three and nine months ended September 30 were as follows (dollars in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Provision for income taxes	$	133		$	174		$	168		$	374
Effective income tax rate		5.4	%		7.8	%		4.9	%		17.0	%

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Significant Segment Financial Data

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

	BBU		VI Chip			Picor			Corporate			Eliminations (1)			Total
2016:
Net revenues	$	38,518	$	11,961		$	5,320		$	—		$	(2,572	)	$	53,227
Income (loss) from operations		3,734		(1,915	)		627			(173	)		—			2,273
Total assets		193,115		21,453			6,928			72,521			(138,979	)		155,038
Depreciation and amortization		1,025		531			142			375			—			2,073
2015:
Net revenues	$	41,119	$	6,023		$	2,791		$	—		$	(1,269	)	$	48,664
Income (loss) from operations		5,612		(6,564	)		(1,169	)		(97	)		—			(2,218	)
Total assets		163,801		15,372			4,796			88,142			(108,836	)		163,275
Depreciation and amortization		1,119		633			123			356			—			2,231

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

	BBU		VI Chip			Picor			Corporate			Eliminations (1)			Total
2016:
Net revenues	$	115,963	$	30,126		$	12,596		$	—		$	(6,490	)	$	152,195
Income (loss) from operations		9,475		(12,131	)		(510	)		(591	)		—			(3,757	)
Total assets		193,115		21,453			6,928			72,521			(138,979	)		155,038
Depreciation and amortization		3,293		1,660			404			1,027			—			6,384
2015:
Net revenues	$	131,396	$	28,939		$	13,870		$	—		$	(5,405	)	$	168,800
Income (loss) from operations		17,618		(15,336	)		474			(571	)		—			2,185
Total assets		163,801		15,372			4,796			88,142			(108,836	)		163,275
Depreciation and amortization		3,424		2,150			318			1,062			—			6,954

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

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Long-Term Investments - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Unrealized Losses On Short Term And Long Term Investments [Line Items]
Amortized cost of securities		$ 3,340,000
Minimum period for which failed auction securities been in unrealized loss position	12 months
Estimated Fair Value		2,866,000
Gross unrealized losses		474,000
Aggregate credit loss	$ 62,000	72,000	$ 72,000	$ 84,000
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	$ 2,580,000	2,526,000
Gross unrealized losses	420,000	$ 474,000
Aggregate credit loss	62,000
Aggregate temporary impairment loss	$ 358,000

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Long-Term Investments - Summary of Available-for-Sale Securities (Detail) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost		$ 3,340,000
Gross Unrealized Gains		0
Gross unrealized losses		474,000
Estimated Fair Value		2,866,000
Failed Auction Security [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 3,000,000	3,000,000
Gross Unrealized Gains	0	0
Gross unrealized losses	420,000	474,000
Estimated Fair Value	$ 2,580,000	2,526,000
Brokered Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		340,000
Gross Unrealized Gains		0
Estimated Fair Value		$ 340,000

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Long-Term Investments - Amortized Cost and Estimated Fair Value of Failed Auction Securities by Contractual Maturities (Detail) $ in Thousands	Sep. 30, 2016 USD ($)
Available-for-sale Securities, Debt Maturities [Abstract]
Due in twenty-six years, Cost	$ 3,000
Due in twenty-six years, Estimated Fair Value	$ 2,580

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Long-Term Investments - Rollforward of Credit (Gain) Loss Recognized in Earnings on Failed Auction Security (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Available-for-sale Securities, Debt Maturities [Abstract]
Balance at the beginning of the period	$ 72	$ 84
Reductions in the amount related to credit gain for which other-than-temporary impairment was not previously recognized	(10)	(12)
Balance at the end of the period	$ 62	$ 72

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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value		$ 2,866,000
Failed Auction Security [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	$ 2,580,000	2,526,000
Recurring [Member] | Contingent Consideration Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Liabilities, fair value on recurring basis	(288,000)	(144,000)
Recurring [Member] | Failed Auction Security [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	2,580,000	2,526,000
Recurring [Member] | Long-Term Brokered Certificates of Deposit [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value		340,000
Recurring [Member] | Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	9,989,000	10,412,000
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash equivalents	9,989,000	10,412,000
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-Term Brokered Certificates of Deposit [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value		340,000
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	(288,000)	(144,000)
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Failed Auction Security [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Estimated Fair Value	$ 2,580,000	$ 2,526,000

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Fair Value Measurements - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016 USD ($)
Fair Value Disclosures [Abstract]
Percent of credit loss	2.10%
Rate of return required	5.00%
Estimated timeframe for auctions of securities minimum	3 years
Estimated timeframe for auctions of securities maximum	5 years
Percentage of liquidity risk premium	5.00%
Increase or decrease in the liquidity risk premium	1.00%
Increase or decrease, respectively, the fair value of the Failed Auction Securities	$ 100,000
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0

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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value		$ 2,866
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	$ 2,580
Valuation Technique	Discounted cash flow
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cumulative Probability of Earning Maximum Rate Until Maturity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Cumulative probability of earning the maximum rate until maturity
Weighted Average Interest Rate	0.03%
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cumulative Probability of Principal Return Prior to Maturity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Cumulative probability of principal return prior to maturity
Weighted Average Interest Rate	94.82%
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cumulative Probability of Default [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Cumulative probability of default
Weighted Average Interest Rate	5.15%
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] | Liquidity Risk Premium [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Liquidity risk premium
Weighted Average Interest Rate	5.00%
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recovery Rate in Default [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Recovery rate in default
Weighted Average Interest Rate	40.00%

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Fair Value Measurements - Change in Estimated Fair Values Calculated for Investment Valued on Recurring Basis Utilizing Level 3 Inputs (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Fair Value Disclosures [Abstract]
Balance at the beginning of the period	$ 2,526
Credit gain on available-for-sale securities included in Other income (expense), net	10
Gain included in Other comprehensive income (loss)	44
Balance at the end of the period	$ 2,580

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Fair Value Measurements - Change in Estimated Fair Value Calculated for Liabilities Valued on Recurring Basis Utilizing Level 3 Inputs (Detail) - Significant Unobservable Inputs (Level 3) [Member] - Contingent Consideration Obligations [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at the beginning of the period	$ 144
Obligation incurred upon acquisition of noncontrolling interest	208
Payments	(64)
Balance at the end of the period	$ 288

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Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ (498)	$ 341	$ 171	$ 1,392
Cost of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	(47)	51	59	170
Selling, General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	(327)	215	148	975
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ (124)	$ 75	$ (36)	$ 247

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Stock-Based Compensation - Additional Information (Detail) - 2007 VI Chip Plan [Member] - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified stock options			2,984,250
Stock-based compensation expense reversed	$ (768,000)
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in costs and expenses due to reversal of share-based compensation expense	86,000	$ 86,000
Selling, General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in costs and expenses due to reversal of share-based compensation expense	516,000	516,000
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in costs and expenses due to reversal of share-based compensation expense	$ 166,000	$ 166,000

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Net Income (Loss) per Share - Computation Of Basic And Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income (loss) attributable to Vicor Corporation	$ 2,336	$ 2,503	$ (3,559)	$ 6,679
Denominator:
Denominator for basic net income (loss) per share-weighted average shares	38,837	38,786	38,811	38,742
Effect of dilutive securities:
Employee stock options	347	300		434
Denominator for diluted net income (loss) per share - adjusted weighted-average shares and assumed conversions	39,184	39,086	38,811	39,176
Basic net income (loss) per share	$ 0.06	$ 0.06	$ (0.09)	$ 0.17
Diluted net income (loss) per share	$ 0.06	$ 0.06	$ (0.09)	$ 0.17

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Net Income (Loss) per Share - Computation Of Basic And Diluted Net Income (Loss) Per Share (Parenthetical) (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Options to purchase shares of Common Stock not included in the computation of diluted income (loss) per share	449,464	533,689	1,845,289	141,971

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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 19,652	$ 16,257
Work-in-process	2,991	2,879
Finished goods	3,919	4,306
Net balance	$ 26,562	$ 23,442

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Other Investments - Additional Information (Detail) - Great Wall Semiconductor Corporation (GWS) [Member]	1 Months Ended
	Sep. 30, 2015 USD ($)
Variable Interest Entity [Line Items]
Gross investment	$ 4,999,719
Ownership interest in investment	27.00%
Cash consideration received	$ 4,999,719

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Noncontrolling Interest Transactions - Additional Information (Detail) - USD ($)		3 Months Ended	9 Months Ended
	Mar. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Noncontrolling Interest [Line Items]
Contingent consideration			$ 288,000	$ 144,000
Converpower Corporation [Member]
Noncontrolling Interest [Line Items]
Ownership percentage by parent in certain operating assets and cash	100.00%		100.00%
Minority interest percentage by non controlling interest	49.00%
Percentage of common shares exchanged	49.00%
Contingent consideration		$ 208,000	$ 185,000
Royalty payment description			Through June 30, 2021
Noncontrolling interest		$ 0
Percentage of control of business operations acquired		100.00%
Reduction in cash, short-term interest receivable, and long-term investments		$ 718,000
Deconsolidation effect in statement of operations		0
Converpower Corporation [Member] | Additional Paid-In Capital [Member]
Noncontrolling Interest [Line Items]
Noncontrolling interest		$ (208,000)

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Severance and Other Charges - Summary of Activity Related to Accrued Severance Charges by Segment (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Restructuring and Related Activities [Abstract]
Restructuring Reserve, Beginning Balance	$ 195
Payments	(195)
Restructuring Reserve, Ending Balance	$ 0

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Product Warranties - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016
Guarantees [Abstract]
Product warranty period	2 years

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Product Warranties - Product Warranty Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Guarantees [Abstract]
Balance at the beginning of the period	$ 496	$ 332	$ 584	$ 204
Accruals for warranties for products sold in the period	61	280	291	465
Fulfillment of warranty obligations	(106)	(18)	(374)	(75)
Revisions of estimated obligations	(109)		(159)
Balance at the end of the period	$ 342	$ 594	$ 342	$ 594

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Income Taxes - Provisions for Income Taxes and Effective Income Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 133	$ 174	$ 168	$ 374
Effective income tax rate	5.40%	7.80%	4.90%	17.00%

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Income Taxes - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2016	Mar. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 0		$ 0
Tax benefit recognized	0
Unremitted earnings reversed	55,000
Valuation allowance, deferred tax assets	$ 25,855,000
Converpower Corporation [Member]
Income Tax Disclosure [Line Items]
Ownership percentage by parent in certain operating assets and cash	100.00%	100.00%

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Commitments and Contingencies - Additional Information (Detail)	Sep. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Capital expenditure commitments	$ 596,000

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Segment Information - Significant Segment Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenues	$ 53,227	$ 48,664	$ 152,195	$ 168,800
Income (loss) from operations	2,273	(2,218)	(3,757)	2,185
Total assets	155,038	163,275	155,038	163,275	$ 157,545
Depreciation and amortization	2,073	2,231	6,384	6,954
Operating Segments [Member] | BBU [Member]
Segment Reporting Information [Line Items]
Net revenues	38,518	41,119	115,963	131,396
Income (loss) from operations	3,734	5,612	9,475	17,618
Total assets	193,115	163,801	193,115	163,801
Depreciation and amortization	1,025	1,119	3,293	3,424
Operating Segments [Member] | VI Chip [Member]
Segment Reporting Information [Line Items]
Net revenues	11,961	6,023	30,126	28,939
Income (loss) from operations	(1,915)	(6,564)	(12,131)	(15,336)
Total assets	21,453	15,372	21,453	15,372
Depreciation and amortization	531	633	1,660	2,150
Operating Segments [Member] | Picor [Member]
Segment Reporting Information [Line Items]
Net revenues	5,320	2,791	12,596	13,870
Income (loss) from operations	627	(1,169)	(510)	474
Total assets	6,928	4,796	6,928	4,796
Depreciation and amortization	142	123	404	318
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(173)	(97)	(591)	(571)
Total assets	72,521	88,142	72,521	88,142
Depreciation and amortization	375	356	1,027	1,062
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	(2,572)	(1,269)	(6,490)	(5,405)
Total assets	$ (138,979)	$ (108,836)	$ (138,979)	$ (108,836)