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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Condensed Consolidated Statements Comprehensive Loss    
Net loss $ (7,652) $ (7,876)
Other comprehensive income:    
Gain on available-for-sale securities   4
Total other comprehensive income:   4
Comprehensive loss $ (7,652) $ (7,872)