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Net Loss per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Loss per share    
Net loss $ (86,483) $ (51,000)
Weighted average common shares outstanding, basic and diluted 30,734,109 27,537,939
Net loss per share, basic and diluted $ (2.81) $ (1.85)