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Employee and Consultant Equity-Based Compensation - Black-Scholes Assumptions for Option Granted (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Expected term (in years) 6 years 2 months 23 days 6 years 5 months 5 days 6 years 3 months 4 days
Volatility 77.00% 86.00% 91.00%
Expected dividends $ 0 $ 0 $ 0
Risk free interest rates 2.10% 1.60% 1.70%
Estimated forfeitures 0.00% 8.50% 5.60%
Weighted average fair value (dollars per share) $ 16.24 $ 10.35 $ 16.69