Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

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 September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Research and development	$	385	$	458	$	1,279	$	1,249
Selling, general and administrative	1,599		1,274		4,813		4,534
Total	$	1,984	$	1,732	$	6,092	$	5,783

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 for the three and nine months ended September 30, 2020 and 2019 (in thousands):

	Three Months Ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Stock options	$	619	$	545	$	1,735	$	1,680
RSUs and RSAs	603		461		1,812		1,308
PSUs	295		368		922		1,075
PBOs	467		358		1,623		1,720
Total	$	1,984	$	1,732	$	6,092	$	5,783