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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (17,967) $ (14,192) $ (54,321) $ (41,359)
Other comprehensive income (loss)        
Unrealized gains (losses) on available-for-sale investments, net of taxes 48 91 420 (229)
Comprehensive loss $ (17,919) $ (14,101) $ (53,901) $ (41,588)