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Employee and Consultant Equity-Based Compensation - Black-Scholes Assumptions for Option Granted (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
yr
$ / shares
Dec. 31, 2015
USD ($)
yr
$ / shares
Dec. 31, 2014
USD ($)
yr
$ / shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Expected term (in years) | yr 6.43 6.26 6.25
Volatility 86.00% 91.00% 96.00%
Expected dividends | $ $ 0 $ 0 $ 0
Risk free interest rates 1.60% 1.70% 1.90%
Estimated forfeitures 8.50% 5.60% 0.40%
Weighted average fair value (dollars per share) | $ / shares $ 10.35 $ 16.69 $ 12.63