Net Income (Loss) Per Share - Additional Information (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Aug. 10, 2015 |
Dec. 31, 2016 |
|
| Series D and E Preferred Shares | ||
| Schedule Of Earnings Per Share Basic And Diluted [Line Items] | ||
| Deemed dividend to convertible preferred shareholders | $ 24.9 | $ 24.9 |