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Net Loss Per Common Share - Basic Net 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 $ (2,339) $ (19,417) $ (12,500) $ (32,704)
Adjustments to reconcile to net loss available to common stockholders        
Accumulated dividend on Series B Convertible Preferred Stock 1,574 997 3,613 997
Amortization of beneficial conversion feature 0 31,110 0 31,110
Accretion of increasing-rate dividend feature 0 458 926 458
Total adjustments 1,574 32,565 4,539 32,565
Net loss available to common stockholders $ (3,913) $ (51,982) $ (17,039) $ (65,269)
Weighted average common shares outstanding - diluted (in shares) 110,717,073 108,493,208 110,136,517 108,222,419
Weighted average common shares outstanding - basic (in shares) 110,717,073 108,493,208 110,136,517 108,222,419
Basic net loss per common share (in dollars per share) $ (0.04) $ (0.48) $ (0.15) $ (0.60)