Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

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

Stock-Based Compensation Expense

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cost of revenues	$	59	$	38	$	115	$	72
Selling, general and administrative		957		215		1,499		395
Research and development		164		34		302		74
Total stock-based compensation	$	1,180	$	287	$	1,916	$	541

Summary of Compensation Expense by Type of Award

Compensation expense by type of award for the three and six months ended June 30 was as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Stock options	$	1,005	$	287	$	1,598	$	541
ESPP		175		—		318		—
Total stock-based compensation	$	1,180	$	287	$	1,916	$	541