CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (30,768)	$ 1,720	$ (95,695)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(6,148)	1,550	(18,823)
Total comprehensive income (loss)	$ (36,916)	$ 3,270	$ (114,518)