Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - 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 income (loss)	$ 9,016	$ (12,217)	$ (24,238)	$ (27,072)
Other comprehensive income (loss), net of tax:
Change in foreign currency translation	(282)	(104)	19	(392)
Change in fair value of available for sale securities	(164)	154	147	1,440
Total other comprehensive income (loss)	(446)	50	166	1,048
Comprehensive income (loss)	$ 8,570	$ (12,167)	$ (24,072)	$ (26,024)