Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Stock-Based Compensation Expense

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Cost of revenues	$	277	$	73	$	396	$	142
Selling, general and administrative		1,030		506		1,467		1,025
Research and development		629		187		783		372
Total stock-based compensation	$	1,936	$	766	$	2,646	$	1,539

Summary of Compensation Expense by Type of Award

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Stock options	$	1,737	$	509	$	2,243	$	1,042
ESPP		199		257		403		497
Total stock-based compensation	$	1,936	$	766	$	2,646	$	1,539