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Accounting Policies - Common Stock Equivalents Excluded From Computation of Net Loss Per Share (Details) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Share-based Payment Arrangement, Option    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares) 20,371 18,307
Restricted Stock Units    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares) 2,207 654
Warrant    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares)   25
Convertible Debt Securities    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares) 9,819 9,819