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Basis of Presentation and Significant Accounting Policies - Antidilutive Securities (Details) - shares
shares in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (in shares) 4,242 325
Common stock warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (in shares) 3,864 302
Stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (in shares) 208 23
RSUs    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (in shares) 170 0