Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (59,237)	$ (53,020)	$ (64,790)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	(1,019)	730	69
Net change in unrealized gain (loss) on investments	0	(36)	36
Other comprehensive income (loss), net of tax	(1,019)	694	105
Comprehensive loss	$ (60,256)	$ (52,326)	$ (64,685)