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Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator:    
Net loss attributable to common stockholders $ (24,597) $ (19,620)
Denominator:    
Weighted‑average common shares outstanding—basic and diluted (in shares) 110,742,150 94,723,513
Net loss per share attributable to common stockholders—basic and diluted (in dollars per share) $ (0.22) $ (0.21)