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Condensed Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (25,274) $ (21,885) $ (75,371) $ (53,586)
Other comprehensive income (loss), net of tax:        
Unrealized gain (loss) on investments (4) (8) 26 (2)
Comprehensive loss $ (25,278) $ (21,893) $ (75,345) $ (53,588)