Condensed Consolidated Statements of Comprehensive Income (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 Income And Comprehensive Income [Abstract]
Net Loss	$ (43,148)	$ (9,333)	$ (97,760)	$ (19,065)
Other comprehensive income, net of tax:
Unrealized gain on short-term investments, net of tax		3		21
Comprehensive Net Loss	$ (43,148)	$ (9,330)	$ (97,760)	$ (19,044)