Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (77,837)	$ (85,031)	$ (53,746)
Other comprehensive loss:
Foreign currency translation adjustments	(4,712)	4,790	(213)
Changes in unrealized (loss) gain on investments, net of income taxes of ($44) in 2021, ($116) in 2020, and $156 in 2019.	(1,230)	149	600
Comprehensive loss	$ (83,779)	$ (80,092)	$ (53,359)