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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies                    
Net loss                 $ (32,693) $ (18,332)
Deemed dividend on Series C convertible preferred stock                 (39,492)  
Paid-in-kind preferred stock dividend, including beneficial conversion feature                 (2,844)  
Net loss attributable to common stockholders $ (53,866) $ (11,418) $ (5,803) $ (3,943) $ (948) $ (12,469) $ (2,528) $ (2,387) $ (75,029) $ (18,332)
Weighted average common shares outstanding - basic and diluted                 38,582,432 33,394,285
Basic and diluted net loss per share $ (1.32) $ (0.29) $ (0.15) $ (0.11) $ (0.03) $ (0.35) $ (0.08) $ (0.08) $ (1.94) $ (0.55)