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Share-based Compensation - Summary of Stock Option Activities (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Number of Stock Options    
Options outstanding beginning of period 152,584  
Number of Options, Granted 20,192  
Number of Options, Forfeited and cancelled (2,231)  
Options outstanding end of the period 170,545 152,584
Options exercisable, end of period, Number of Options 105,678  
Options vested and expected to vest, Number of Options 170,367  
Stock Options, Weighted Average Exercise Price    
Weighted Average exercise Price, Options Outstanding, Beginning of period $ 20.20  
Weighted average exercise price, Granted 4.90  
Weighted average exercise price, Forfeited and cancelled 21.72  
Weighted Average exercise Price, Options Outstanding, end of period 18.37 $ 20.20
Weighted average exercise price, Options exercisable, end of period 23.32  
Weighted Average exercise Price, Options vested and expected to vest, end of period $ 18.38  
Stock Options, Weighted Average Remaining Contractual Term    
Weighted Average Remaining Contractual Term (in years) Options Outstanding 7 years 8 months 27 days 8 years 3 months
Options exercisable, Weighted Average Remaining Contractual Term (in years) 7 years 3 months 26 days  
Options vested and expected to vest, Weighted Average Remaining Contractual Term (in years) 7 years 8 months 23 days