S-1/A Granted 100.900 15.39 Unvested at September 30, 2015 100,900 $ 15.39 Share-Based Compensation The fair value of stock options granted to employees is estimated on the date of grant using the Black-Scholes-Merton option valuation model. This share-based compensation expense valuation model requires the Company to make assumptions and judgments regarding the variables used in the calculation. These variables include the expected term (weighted average period of time that the options granted are expected to be outstanding), the expected volatility of the Company's stock, expected risk-free interest rate, expected dividends, and the estimated forfeitures of unvested stock options. To the extent actual results differ from the estimates, the difference will be recorded as a cumulative adjustment in the period estimates are revised. The Company uses the simplified calculation of expected term, as the Company does not have sufficient historical data to use any other method to estimate expected term. Expected volatility is based on an average of the historical volatilities of the common stock of several entities with characteristics similar to those of the Company. The expected risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for periods F-40 Table of Contentit corresponding with the expected life of the option. Expected forfeitures are based on the Company's historical experience. Share- based compensation expense is recorded net of estimated forfeitures on a straight-line basis over the requisite service period. The fair value of stock options granted to non-employees, including consultants, is initially measured upon the date of grant and remeasured over the vesting period using the same methodology described above. These non-employees provide service to the Company on an ongoing basis, therefore, the performance commitment for each non-employee grant is not considered probable until the award is earned