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Stock-Based Compensation and Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2019

Stock-Based Compensation Expense

Stock-based compensation expense for the years ended December 31 was as follows (in thousands):

		2019				2018				2017
Cost of revenues		$	342			$	237			$	187
Selling, general and administrative			1,979				2,517				1,125
Research and development			715				642				423
Total stock-based compensation		$	3,036			$	3,396			$	1,735

Summary of Compensation Expense by Type of Award

Compensation expense by type of award for the years ended December 31 was as follows (in thousands):

		2019				2018				2017
Stock options		$	2,072			$	2,649			$	1,546
ESPP			964				747				189
Total stock-based compensation		$	3,036			$	3,396			$	1,735

Weighted-Average Assumptions for Non Performance-Based Fair Value for Stock Options

The fair value for non-performance-based stock options awarded under the 2000 Plan for the years shown below was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:    

		2019				2018				2017
Risk-free interest rate			1.8	%			2.9	%			2.1	%
Expected dividend yield			—				—				—
Expected volatility			42	%			44	%			43	%
Expected lives (years)			6.3				6.4				7.1

2000 Plan, Vicor [Member]

Stock-Based Compensation Expense

A summary of the activity under the 2000 Plan as of December 31, 2019 and changes during the year then ended, is presented below (in thousands except for share and weighted-average data):

		Options Outstanding				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Life in Years				Aggregate Intrinsic Value
Outstanding on December 31, 2018			1,382,981			$	13.41
Granted			115,753			$	31.76
Options transferred from VI Chip Merger			1,476,371			$	6.79
Forfeited and expired			(36,228	)		$	21.37
Exercised			(250,981	)		$	9.71
Outstanding on December 31, 2019			2,687,896			$	10.81				4.65			$	96,665
Exercisable on December 31, 2019			1,475,947			$	8.74				4.10			$	56,079
Vested or expected to vest as of December 31, 2019(1)			2,601,076			$	10.65				4.62			$	93,938

(1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. The number of options expected to vest is calculated by applying an estimated forfeiture rate to the unvested options.

Vi Chip Plan [Member]

Stock-Based Compensation Expense

A summary of the activity under the 2007 VI Chip Plan as of June 28, 2019, the date of the merger with and into Vicor and changes during the period then ended, is presented below:

		Options Outstanding				Weighted- Average Exercise Price
Outstanding on December 31, 2018 (1)			10,414,000			$	0.96
Granted			—
Forfeited and expired			—
Exercised			—
Options transferred in merger with Vicor			(10,414,000	)		$	0.96
Outstanding on June 28, 2019			—

(1) Of the total VI Chip options outstanding on December 31, 2018, 5,500,000 options had been granted to Dr. Vinciarelli, the Company’s Chief Executive Officer.

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