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Net Loss Per Common Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net loss $ (1,277) $ (6,086)
Denominator:    
Weighted-average common shares outstanding 14,872,369 12,498,698
Less: weighted-average unvested common shares subjected to repurchase (83,333) (198,717)
Weighted-average common shares outstanding used to calculate net loss per common share, basic and diluted 14,789,036 12,299,981
Net loss per common share, basic and diluted $ (0.09) $ (0.49)