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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (8,019) $ (11,117)
Other comprehensive income (loss):    
Net change in unrealized losses on available-for-sale securities 43 (20)
Comprehensive loss $ (7,976) $ (11,137)