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Share-based compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Estimated Grant Date Fair Value of Share Options, Using Black-Scholes Option-Pricing Formula | We estimate the fair value of each stock option on the date of grant using a Black-Scholes option-pricing formula, applying the following assumptions, and amortize the fair value to expense over the option’s vesting period using the straight-line attribution approach for employees and non-employee directors:
|  | Three Months Ended June 30, 2015 |
Expected term (in years) |  |  | 4 |
Risk-free interest rate |  |  | 1.57 | %
Expected volatility |  |  | 20.97 | %
Expected dividend yield |  |  | 0.00 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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