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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (30,055) $ (21,561)
Other comprehensive income (loss):    
Unrealized (loss) gain on available-for-sale securities (4) 1
Total comprehensive loss $ (30,059) $ (21,560)