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Employee Benefits and Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation Expense Recognized in Consolidate Statements of Income | The following table sets forth the total share-based compensation expense recognized in our Condensed Consolidated Statements of Operations:
| Three months ended |  | Nine months ended
| September 30, 2015 |  | September 30, 2014 |  | September 30, 2015 |  | September 30, 2014
| (In thousands)
Cost of product and service revenues | $ | 581 |  |  | $ | 441 |  |  | $ | 1,630 |  |  | $ | 973 |
Research and development | 587 |  |  | 407 |  |  | 1,472 |  |  | 1,156 |
Selling, general and administrative | 2,798 |  |  | 2,313 |  |  | 8,165 |  |  | 6,481 |
Total share-based compensation expense | $ | 3,966 |  |  | $ | 3,161 |  |  | $ | 11,267 |  |  | $ | 8,610 |
Estimate of Fair Value of Share-Based Awards, Employee Stock Purchase Plan | The following weighted average assumptions are used to value share options and Employee Stock Purchase Plan ("ESPP") shares issued pursuant to our equity incentive plans for the three and nine months ended September 30, 2015 and September 30, 2014:
| Three months ended |  | Nine months ended
| September 30, 2015 |  | September 30, 2014 |  | September 30, 2015 |  | September 30, 2014
| (In thousands, except percentages)
Stock Option Plans |  |  |  |  |  |  |
Expected life, years | 5.04 |  |  | 4.81 |  |  | 5.04 |  |  | 4.80 |
Expected volatility, % | 29.3 | % |  | 34.1 | % |  | 31.1 | % |  | 35.1 | %
Risk free interest rate, % | 1.73 | % |  | 1.70 | % |  | 1.63 | % |  | 1.56 | %
Estimated forfeiture rate % | 2.5 | % |  | 2.5 | % |  | 2.5 | % |  | 2.5 | %
Dividend yield, % | — | % |  | — | % |  | — | % |  | — | %
| Three months ended |  | Nine months ended
| September 30, 2015 |  | September 30, 2014 |  | September 30, 2015 |  | September 30, 2014
| (In thousands, except percentages)
Employee Stock Purchase Plan |  |  |  |  |  |  |
Expected life, years | 0.5-2.0 |  |  | 0.5-2.0 |  |  | 0.5-2.0 |  |  | 0.5-2.0 |
Expected volatility, % | 25.79-34.36% |  |  | 29.56-39.69% |  |  | 25.79-37.53% |  |  | 29.56-42.16% |
Risk free interest rate, % | 0.12-0.79% |  |  | 0.03-0.53% |  |  | 0.03-0.79% |  |  | 0.03-0.53% |
Estimated forfeiture rate % | — | % |  | — | % |  | — | % |  | — | %
Dividend yield, % | — | % |  | — | % |  | — | % |  | — | %
Estimate of Fair Value of Share-Based Awards, Share Options | The following weighted average assumptions are used to value share options and Employee Stock Purchase Plan ("ESPP") shares issued pursuant to our equity incentive plans for the three and nine months ended September 30, 2015 and September 30, 2014:
| Three months ended |  | Nine months ended
| September 30, 2015 |  | September 30, 2014 |  | September 30, 2015 |  | September 30, 2014
| (In thousands, except percentages)
Stock Option Plans |  |  |  |  |  |  |
Expected life, years | 5.04 |  |  | 4.81 |  |  | 5.04 |  |  | 4.80 |
Expected volatility, % | 29.3 | % |  | 34.1 | % |  | 31.1 | % |  | 35.1 | %
Risk free interest rate, % | 1.73 | % |  | 1.70 | % |  | 1.63 | % |  | 1.56 | %
Estimated forfeiture rate % | 2.5 | % |  | 2.5 | % |  | 2.5 | % |  | 2.5 | %
Dividend yield, % | — | % |  | — | % |  | — | % |  | — | %
| Three months ended |  | Nine months ended
| September 30, 2015 |  | September 30, 2014 |  | September 30, 2015 |  | September 30, 2014
| (In thousands, except percentages)
Employee Stock Purchase Plan |  |  |  |  |  |  |
Expected life, years | 0.5-2.0 |  |  | 0.5-2.0 |  |  | 0.5-2.0 |  |  | 0.5-2.0 |
Expected volatility, % | 25.79-34.36% |  |  | 29.56-39.69% |  |  | 25.79-37.53% |  |  | 29.56-42.16% |
Risk free interest rate, % | 0.12-0.79% |  |  | 0.03-0.53% |  |  | 0.03-0.79% |  |  | 0.03-0.53% |
Estimated forfeiture rate % | — | % |  | — | % |  | — | % |  | — | %
Dividend yield, % | — | % |  | — | % |  | — | % |  | — | %
Stock Option Activity under the Equity Incentive Plans | The following table summarizes the stock option activity under the Company’s equity incentive plans during the nine months ended September 30, 2015:
| Number of Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Years |  | Aggregate Intrinsic Value(1)
| (In thousands, except per share data)
Stock Options |  |  |  |  |  |  |
Outstanding at December 31, 2014 | 2,672 |  |  | $ | 19.02 |  |  | 6.5 |  |
Granted | 322 |  |  | 34.90 |  |  |  |  |
Exercised | (494 | ) |  | 15.90 |  |  |  |  |
Expired | (2 | ) |  | 15.72 |  |  |  |  |
Forfeited | (81 | ) |  | 23.82 |  |  |  |  |
Outstanding at September 30, 2015 | 2,417 |  |  | $ | 21.61 |  |  | 6.5 |  | $ | 24,341 |
Exercisable at September 30, 2015 | 1,368 |  |  | $ | 16.73 |  |  | 4.8 |  | $ | 19,660 |
Vested and expected to vest at September 30, 2015 and thereafter | 2,390 |  |  | $ | 21.50 |  |  | 6.4 |  | $ | 24,293 |
_________________________________________________
(1) | Intrinsic value is calculated as the difference between the market value or closing price of our common stock as of the last trading day of the period as reported by the NASDAQ Global Select Market, and the exercise price of the option.
Restricted Stock Units Activity under the Stock Option Activity under the Equity Incentive Plans | Restricted stock activity under the Company’s equity incentive plans in the nine months ended September 30, 2015 is as follows:
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Years |  | Aggregate Intrinsic Value
| (In thousands, except per share data)
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Outstanding at December 31, 2014 | 399 |  |  | $ | 24.00 |  |  | 1.5 |  |
Granted | 131 |  |  | 34.72 |  |  |  |  |
Vested | (99 | ) |  | 21.51 |  |  |  |  |
Forfeited | (29 | ) |  | 23.79 |  |  |  |  |
Outstanding and unvested at September 30, 2015 | 402 |  |  | $ | 28.10 |  |  | 1.3 |  | $ | 12,503 |
Expected to vest after September 30, 2015 | 392 |  |  |  |  | 1.2 |  | $ | 12,181 |
Restricted Stock Units Award under the Stock Option Activity under the Equity Incentive Plans |
| Number of Shares |  | Weighted-Average Grant Date Fair Value
| (In thousands, except per share data)
Restricted Stock Awards (RSAs) |  |  |
Outstanding at December 31, 2014 | 36 |  |  | $ | 26.47 |
Granted | 37 |  |  | 36.05 |
Vested | (41 | ) |  | 26.47 |
Forfeited | (1 | ) |  | 27.65 |
Outstanding and unvested at September 30, 2015 | 31 |  |  | $ | 35.95 |
Performance Shares Restricted Stock Activity under the Stock Option Activity under the Equity Incentive Plans | Performance-based restricted stock activity under our equity incentive plans in the nine months ended September 30, 2015 is as follows:
| Number of Shares |  | Weighted-Average Grant Date Fair Value Per Unit
| (In thousands, except per share data)
Performance-based Restricted Stock Units (PSUs) |  |  |
Outstanding at December 31, 2014 | 233 |  |  | $ | 17.96 |
Granted | 60 |  |  | 29.56 |
Vested | (70 | ) |  | 18.91 |
Forfeited | (27 | ) |  | 14.69 |
Outstanding and unvested at September 30, 2015 | 196 |  |  | $ | 21.63 |
Shares Reserved for Future Issuance under the Stock Option Activity under the Equity Incentive Plans | We had the following ordinary shares reserved for future issuance under our equity incentive plans as of June 30, 2015:
| Number of Shares
| (In thousands)
Share options outstanding | 2,417 |
Restricted share awards outstanding | 629 |
Shares authorized for future issuance | 4,402 |
ESPP shares available for future issuance | 3,251 |
Total shares reserved for future issuance as of September 30, 2015 | 10,699 |

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