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Employee and Consultant Equity-Based Compensation - Black-Scholes Assumptions for Option Granted (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
yr
$ / shares
Mar. 31, 2015
USD ($)
yr
$ / shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Expected term (in years) | yr 6.48 8.19
Volatility (percent) 87.00% 89.00%
Expected dividends | $ $ 0 $ 0
Risk free interest rates (percent) 1.61% 1.78%
Fair value per share (dollars per share) | $ / shares $ 9.68 $ 17.46