Net Loss per Share - Schedule of Potentially Dilutive Shares Excluded from Calculation of Diluted Net Loss per Share (Details) - shares shares in Thousands |
9 Months Ended | |
|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
|
| 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 | 10,892 | 16,999 |
| 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 | 159,990 | 141,179 |
| 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 | 55,468 | |