CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 1,720	$ (95,695)	$ (100,639)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	1,550	(18,823)	24,117
Total comprehensive income (loss)	$ 3,270	$ (114,518)	$ (76,522)