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Net Loss Per Common Share - Diluted 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
Computation of basic and diluted net loss per share [Abstract]        
Net loss available to common stockholders $ (3,913) $ (51,982) $ (17,039) $ (65,269)
Dividends on Series B Convertible Preferred Stock $ 1,574 $ 32,565 $ 4,539 $ 32,565
Weighted average shares outstanding (in shares) 110,717,073 108,493,208 110,136,517 108,222,419
Potential common shares 30,658,193 28,625,684 30,185,813 11,032,820
Weighted average shares outstanding adjusted for potential common shares 110,717,073 108,493,208 110,136,517 108,222,419
Diluted net (loss) income per common share (in dollars per share) $ (0.04) $ (0.48) $ (0.15) $ (0.60)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 30,658,193 28,625,684 30,185,813 11,032,820
Series B Convertible Preferred Stock        
Computation of basic and diluted net loss per share [Abstract]        
Potential common shares 27,027,252 25,691,700 26,497,570 8,626,410
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 27,027,252 25,691,700 26,497,570 8,626,410
Restricted stock awards        
Computation of basic and diluted net loss per share [Abstract]        
Potential common shares 974,687 1,203,853 1,287,635 1,281,635
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 974,687 1,203,853 1,287,635 1,281,635
Restricted stock unit awards        
Computation of basic and diluted net loss per share [Abstract]        
Potential common shares 1,840,483 919,233 1,500,674 359,103
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 1,840,483 919,233 1,500,674 359,103
Outstanding stock options        
Computation of basic and diluted net loss per share [Abstract]        
Potential common shares 805,437 772,967 875,714 739,937
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 805,437 772,967 875,714 739,937
Performance stock unit awards        
Computation of basic and diluted net loss per share [Abstract]        
Potential common shares 10,334 37,931 24,220 25,735
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 10,334 37,931 24,220 25,735