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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Condensed Consolidated Statements Comprehensive Loss        
Net loss $ (6,479) $ (6,974) $ (14,131) $ (14,850)
Other comprehensive income:        
Gain on available-for-sale securities       4
Total other comprehensive income:       4
Comprehensive loss $ (6,479) $ (6,974) $ (14,131) $ (14,846)