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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (26,694) $ (29,582)
Other comprehensive loss:    
Unrealized (loss) gain on available-for-sale securities (2) 12
Comprehensive loss $ (26,696) $ (29,570)