Stock-Based Awards (Tables)

9 Months Ended

Sep. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Options Activity

The following table summarizes stock option activity for the nine months ended September 30, 2020 (in thousands):

	Number of Underlying Shares
Outstanding at December 31, 2019		3,262
Granted		649
Exercised		(326	)
Forfeited or expired		(166	)
Outstanding at September 30, 2020		3,419
Vested and exercisable at September 30, 2020		1,647

Summary of Restricted Stock Units

The following table summarizes activity for restricted stock units, or RSUs, and RSUs with performance conditions, or PSUs, for the nine months ended September 30, 2020 (in thousands):

	Number of Underlying Shares
	RSUs			PSUs
Outstanding at December 31, 2019		509			252
Granted		543			241
Vested		(120	)		(243	)
Forfeited		(46	)		(9	)
Outstanding at September 30, 2020		886			241

Summary of Stock-Based Compensation Expense

The following table presents stock-based compensation expense included in our condensed consolidated statements of operations for the periods presented (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Cost of revenue	$	212	$	192	$	595	$	495
Research and development expense		2,088		1,717		5,749		4,028
Sales and marketing expense		1,451		1,622		4,023		4,028
General and administrative expense		1,932		1,262		5,134		3,262
Total stock-based compensation expense	$	5,683	$	4,793	$	15,501	$	11,813