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Stock-Based Compensation

6 Months Ended

Jun. 30, 2019

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

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards, whether they possess time-based vesting provisions or performance-based vesting provisions, and awards granted under the Vicor Corporation 2017 Employee Stock Purchase Plan (“ESPP”), as of their grant date.

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


	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Cost of revenues	$	73	$	59	$	142	$	115
Selling, general and administrative		506		957		1,025		1,499
Research and development		187		164		372		302

Total stock-based compensation	$	766	$	1,180	$	1,539	$	1,916

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


	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Stock options	$	509	$	1,005	$	1,042	$	1,598
ESPP		257		175		497		318

Total stock-based compensation	$	766	$	1,180	$	1,539	$	1,916