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Summary of Significant Accounting Policies - Potential Common Shares Excluded from Computations of Diluted Net Loss Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computations of net loss per share (in shares) 103,894 27,488
Stock options, restricted stock units and performance awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computations of net loss per share (in shares) 7,988 6,974
Series B Convertible Preferred Stock Purchase Agreements    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computations of net loss per share (in shares) 66,176 0
Bridge Loans | Bridge Loans    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computations of net loss per share (in shares) 8,979 0
2019 Convertible Notes | Convertible Notes    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computations of net loss per share (in shares) 18,966 18,966
2019 Convertible Notes potential make-whole shares | Convertible Notes    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computations of net loss per share (in shares) 1,775 1,538
2014 Convertible Notes | Convertible Notes    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computations of net loss per share (in shares) 10 10