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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
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computations of net loss per share (shares) 27,463 6,258
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 (shares) 7,652 5,342
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 (shares) 18,966 0
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 (shares) 826 0
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 (shares) 19 916