Stock Based Compensation -Valuation Assumptions Employees (Details) - USD ($) |
11 Months Ended | 12 Months Ended | |
|---|---|---|---|
Dec. 31, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Weighted-average assumptions used to estimate fair value of share-based awards | |||
| Risk-free interest rate | 1.70% | 1.60% | 1.70% |
| Expected volatility | 97.00% | 84.60% | 83.30% |
| Expected term (in years) | 6 years 1 month 6 days | 6 years | 6 years 1 month 6 days |
| Expected dividend yield | 0.00% | 0.00% | 0.00% |
| Unrecognized compensation expense | $ 18.5 | $ 4,700,000 | |
| Expected period for recognizing compensation expense | 3 years 3 months 11 days | 3 years 7 months 21 days | |