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STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
STATEMENTS OF COMPREHENSIVE LOSS      
Net (loss) income $ (29,537) $ 46 $ (35,670)
Net unrealized gain (loss) on marketable securities 160 (129) (70)
Comprehensive loss $ (29,377) $ (83) $ (35,740)