Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of stock-based compensation expense

Stock-based compensation expense is included in the unaudited condensed consolidated statements of operations as follows (in thousands):

	Three Months Ended March 31,
	2021		2020
Research and development	$	477	$	424
Selling, general and administrative	2,210		1,745
Total	$	2,687	$	2,169

Schedule of stock-based compensation expense by security types

The following table presents total stock-based compensation expense by security type included in the unaudited condensed consolidated statements of operations (in thousands):

	Three Months Ended March 31,
	2021		2020
Stock options	$	665	$	541
RSUs and RSAs	542		599
PSUs	470		331
PBOs	1,010		698
Total	$	2,687	$	2,169