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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (5,042) $ (4,138)
Other comprehensive income (loss):    
Unrealized gain on available-for-sale securities (4) 1
Total comprehensive loss $ (5,046) $ (4,137)