Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Research and development	$	597	$	471	$	1,074	$	894
Selling, general and administrative	2,247		1,468		4,457		3,214
Total	$	2,844	$	1,939	$	5,531	$	4,108

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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Stock options	$	682	$	575	$	1,347	$	1,116
RSUs and RSAs	690		610		1,232		1,210
PSUs	573		296		1,043		627
PBOs	899		458		1,909		1,155
Total	$	2,844	$	1,939	$	5,531	$	4,108