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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (25,238) $ (16,033) $ (67,604) $ (37,334)
Other comprehensive loss:        
Unrealized loss on available-for-sale debt securities (1) (33) (4) (26)
Total comprehensive loss $ (25,239) $ (16,066) $ (67,608) $ (37,360)