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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
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
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 7,008 12,491
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 152,972 158,253
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