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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (56,241) $ (55,178)
Other comprehensive income (loss):    
Unrealized (loss) gain on available-for-sale debt securities (29) 38
Total comprehensive loss $ (56,270) $ (55,140)