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Net Loss per Share - Schedule of Potentially Dilutive Shares Excluded from Calculation of Diluted Net Loss per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stock Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted net loss per share 5,305 9,793
Unvested Restricted Stock Units And Restricted Stock Awards Not Subject To A Performance Condition    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted net loss per share 114,307 143,511
Convertible Notes (If Converted)    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted net loss per share 101,591 55,468