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Share-Based Payments (Details) (Equity Incentive Plan 2012)
9 Months Ended
Sep. 30, 2014
installment
Share-based payments  
Maximum number of shares of common stock provided for issuance 4,000,000
Employee Stock Option
 
Share-based payments  
Number of annual installments in which the awards would generally vest starting on the first anniversary of the date of grant 4
Contractual term 10 years