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Condensed Consolidated Statements Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Condensed Consolidated Statements of Comprehensive Loss    
Net Loss $ (7,876) $ (9,418)
Other comprehensive income:    
Unrealized gains on available-for-sale securities 4 14
Total other comprehensive income: 4 14
Comprehensive loss $ (7,872) $ (9,404)