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Net Loss Per Share - Computation of Basic and Diluted Loss Per Share of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:      
Net loss - Basic and diluted $ (122,461) $ (23,605) $ (27,780)
Denominator:      
Weighted average common shares outstanding - Basic and diluted 294,549,146 261,228,108 236,040,717
Net loss per share attributable to common stockholders - Basic and diluted $ (0.42) $ (0.09) $ (0.12)