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Net Loss Per Share - Calculation of Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator:    
Net loss attributable to common stockholders $ (18,663) $ (14,314)
Denominator:    
Weighted average shares used in computing net loss per share attributable to common stockholders—basic and diluted (in shares) 41,218,355 35,666,172
Net loss per share attributable to common stockholders—basic and diluted (in dollars per share) $ (0.45) $ (0.40)