Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

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

Summary of Weighted Average Assumptions Used to Value Options

	Three months ended
	March 31, 2019
Volatility	66	%
Expected dividend yield	—
Risk-free rate	2.27	%
Expected term (in years)	6

Schedule of Employee Service Share-based Compensation for Stock Options, Restricted Stock Units and ESPP Shares

The following table presents the effects of stock-based compensation for stock options, RSUs (including performance-based RSUs), and ESPP purchase rights (in thousands):

	Three Months Ended
	March 31,
	2020		2019
Cost of revenue	$	142	$	65
Research and development		696		389
Selling, general and administrative		1,087		621
Total	$	1,925	$	1,075