CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (14,229)	$ 9,700	$ (10,185)	$ 22,188
Other comprehensive income (loss), net of applicable taxes:
Foreign currency translation adjustment	2,612	(2,182)	2,898	(1,922)
Unrealized (loss) gain on short-term investments	(325)	(182)	(147)	465
Total other comprehensive income (loss)	2,287	(2,364)	2,751	(1,457)
Comprehensive (loss) income	$ (11,942)	$ 7,336	$ (7,434)	$ 20,731