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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 $ (12,018) $ (13,854)
Other comprehensive loss:    
Unrealized loss on available-for-sale investments, net   22
Total comprehensive loss $ (12,018) $ (13,832)