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Net Loss Per Share - Computation of Basic and Diluted Loss Per Share Attributable to Common Stockholders (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net loss $ (18,108) $ (23,539) $ (65,437) $ (75,150)
Denominator:        
Weighted average common shares outstanding - basic and diluted 89,365,798 62,828,513 89,109,772 62,676,591
Net loss per share - basic and diluted $ (0.20) $ (0.37) $ (0.73) $ (1.20)