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Net Income (Loss) Per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net loss $ (10,779) $ (6,530)
Denominator:    
Weighted average outstanding shares used for basic and diluted net loss per share (in shares) 20,495,671 14,662,092
Net loss per share:    
Basic and diluted (in USD per share) $ (0.53) $ (0.45)