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Net Income (Loss) Per Common Share - Antidilutive Securities Excluded from Computation (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 2,325 27,668 2,343 27,668
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 825 890 843 890
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 1,500 1,500 1,500 1,500
Series B Preferred Stock, as-converted        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 0 25,278 0 25,278