Net Loss Per Share - Additional Information (Details) - shares shares in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Earnings Per Share [Abstract] | ||||
| Antidilutive common stock equivalent shares excluded from calculation of diluted net income (loss) per share (in shares) | 3.6 | 4.1 | 3.4 | 4.2 |