UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss)	$ (20,740)	$ (32,296)	$ (46,112)	$ (61,013)
Other comprehensive income (loss), net of tax
Unrealized gain on available-for-sale securities	0	238	100	612
Foreign currency translation adjustments	2,028	(409)	1,514	1,218
Total other comprehensive income (loss), net of tax	2,028	(171)	1,614	1,830
Comprehensive (loss)	$ (18,712)	$ (32,467)	$ (44,498)	$ (59,183)