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Net Loss Per Share - Computation of Net Loss Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:      
Net loss $ (158,165) $ (94,313) $ (94,940)
Denominator:      
Weighted average common shares outstanding - basic 104,205,645 89,582,138 64,478,066
Weighted average common shares outstanding - diluted 104,205,645 89,582,138 64,478,066
Net loss per share - basic (in dollars per share) $ (1.52) $ (1.05) $ (1.47)
Net loss per share - diluted (in dollars per share) $ (1.52) $ (1.05) $ (1.47)