Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - 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	$ (53,324)	$ (37,763)	$ (79,124)	$ (72,965)
Other comprehensive (loss) income, net of tax:
Change in unrealized gains related to marketable securities	444	353	272	723
Foreign currency translation adjustments	(34)	0	(29)	0
Total other comprehensive income	410	353	243	723
Comprehensive loss	$ (52,914)	$ (37,410)	$ (78,881)	$ (72,242)