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Net Loss Per Common Share - Computation of Basic and Diluted Net Loss per Share Attributable to Common Stock holders (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net loss $ (8,019) $ (11,117)
Denominator:    
Weighted-average shares used to compute net loss per common share, basic and diluted 24,474,308 23,479,955
Net loss per common share, basic and diluted $ (0.33) $ (0.47)