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Condensed Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (55,993) $ (38,503)
Other comprehensive income (loss), net of tax:    
Unrealized gain (loss) on investments (11) 314
Comprehensive loss $ (56,004) $ (38,189)