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STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]      
Net (loss) income $ (27,916) $ (29,537) $ 46
Net unrealized (loss) gain on marketable securities (154) 160 (129)
Comprehensive loss $ (28,070) $ (29,377) $ (83)