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Net Loss Per Common Share - Summary of Basic and diluted loss per common share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net loss $ (10,196) $ (7,155) $ (34,598) $ (15,929)
Weighted average common shares outstanding, basic and diluted 27,527,770 22,142,148 24,011,862 15,772,918
Net loss per common share $ (0.37) $ (0.32) $ (1.44) $ (1.01)