Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2020		2019
Research and development	$	424	$	388
Selling, general and administrative	1,745		1,675
Total	$	2,169	$	2,063

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 months ended March 31, 2020 and 2019 (in thousands):

	Three Months Ended March 31,
	2020		2019
Stock options	$	541	$	554
RSUs and RSAs	599		461
PSUs	331		391
PBOs	698		657
Total	$	2,169	$	2,063