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Accounting Policies - Common Stock Equivalents Excluded From Computation of Net Loss Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Payment Arrangement, Option    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares) 18,795 16,510
Restricted Stock Units    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares) 570  
Warrant    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares) 220 220
Convertible Debt Securities    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares) 9,653 9,095