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Share based compensation - Fair Value Assumptions (Details) - company
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Assumptions used to estimate the fair values of the share options granted using the Black-Scholes option-pricing model    
Expected term 5 years 5 years
Expected volatility (as a percent) 68.00% 60.00%
Risk free rate (as a percent) 1.07% 1.09%
Expected dividend yield (as a percent) 0.00% 0.00%
Number of companies with similar public securities, considered for expected volatility rate computation 7