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Share-Based Compensation (Details 1)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 78.92% 83.03%
Risk-free interest rate 1.97% 1.31%
Expected term of option 6 years 4 months 2 days 5 years 4 months 28 days
Forfeiture rate 0.00% 3.00% [1]
Expected dividend yield 0.00% 0.00%
[1] In 2016, authoritative guidance required forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. During the nine-month period ended September 30, 2016, forfeitures were estimated at 3%.