The fair value of the Tranche 1 options was estimated on the date of grant using the
Black-Scholes-Merton option-pricing model. Key assumptions used in estimating the grant-date fair value of these options were as follows: the fair value of the ordinary shares, dividend yield/interest yield, expected volatility, risk-free interest
rate and expected term. The expected term of the time vesting options was based on the simplified methodology prescribed by SAB No. 107 (SAB 107). The expected term is determined by computing the mathematical mean of the
average vesting period and the contractual life of the options. The Company utilizes the simplified method for options granted due to the lack of historical exercise data necessary to provide a reasonable basis upon which to estimate the term. The
Company considers the historical and implied volatility of publicly-traded companies within the Companys peer group when selecting the appropriate volatility to apply to the options. Ultimately, the Company utilizes the implied volatility to
calculate the fair value of the options as it provides a forward-looking indication and may provide insight into expected industry volatility. The risk-free interest rate is based on the yield for a U.S. Treasury security having a maturity similar
to the expected life of the related grant. The dividend yield is based on managements judgment with input from the Companys Board of Directors.
The Company performs contemporaneous valuations to estimate the fair value of the Companys ordinary shares in connection with the
issuance of share-based payment awards. The Company relies on these valuation analyses in determining the fair value of the share-based payment awards. The assumptions required by these valuation analyses involve the use of significant judgments and
estimates on the part of management.
significant awards, the valuation analysis of the ordinary shares of the Company utilizes a combination of the discounted cash flow method and the guideline company method. For less significant awards, the Company relies solely on the discounted
cash flow method. For the discounted cash flow method, the Company prepares detailed annual projections of future cash flows over a period of five fiscal years (the Discrete Projection Period). The Company estimates the total value of
the cash flow beyond the final fiscal year (the Terminal Year) by applying a multiple to the final projected fiscal year net earnings before interest, taxes, depreciation and amortization (EBITDA). The cash flows from the
Discrete Projection Period and the Terminal Year are discounted at an estimated weighted-average cost of capital. The estimated weighted-average cost of capital is derived, in part, from the median capital structure of comparable companies within
similar industries. The Company believes that its procedures for estimating discounted future cash flows, including the Terminal Year valuation, were reasonable and consistent with accepted valuation practices. For the guideline company method, the
Company performs an analysis to identify a group of publicly-traded companies that are comparable to the Company. Many of the Companys competitors are smaller, privately-held companies or divisions within large publicly-traded companies.
Therefore, in order to develop market-based multiples, the Company uses data from publicly-traded companies that operate in similar industries in which the Company competes. The Company calculates an implied EBITDA multiple (enterprise value/EBITDA)
for each of the guideline companies and selects an EBITDA multiple from within the range of the multiples calculated. Because the resulting enterprise value under this guideline company method have generally been within 10% of the enterprise value
under the discounted cash flow method, the Company utilizes the average of the two methods to determine the fair value of the ordinary shares. The Company believes that this approach is consistent with the principles and guidance set forth in the
2004 AICPA Practice Aid on Valuation of Privately-Held-Company Equity Securities Issued as Compensation.
The fair value of the Tranche 2 and 3 options was estimated on the date of grant using the Monte Carlo Simulation Approach. Key assumptions
used include those described above for determining the fair value of Tranche 1 options in addition to assumed time to liquidity and probability of an initial public offering versus a disposition. The assumed time to liquidity and probability of an
initial public offering versus a disposition were based on managements judgment with input from the Companys Board of Directors.
Under the fair value recognition provisions of ASC 718, the Company recognizes share-based compensation expense net of an estimated
forfeiture rate and therefore only recognizes compensation cost over the service period of the awards expected to vest. The Company estimates its forfeiture rate as of December 31, 2009 at 11%. The expense recognized under ASC 718 was $2,233,
$2,108 and $2,015 for the years ended December 31, 2009, 2008 and 2007, respectively.