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Employee Benefits and Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation Expense Recognized in Consolidated Statements of Income | The following table sets forth the total share-based compensation expense recognized in the Company’s Condensed Consolidated Statements of Operations for the three months ended March 31, 2019 and 2018:
| Three months ended
| March 31, 2019 |  | March 31, 2018
| (In thousands)
Cost of product and service revenues | $ | 1,462 |  |  | $ | 1,019 |
Research and development | 1,702 |  |  | 1,234 |
Selling, general, and administrative | 5,246 |  |  | 4,275 |
Total share-based compensation expense | $ | 8,410 |  |  | $ | 6,528 |
Stock Option Plans, Valuation Assumptions | The following assumptions were used to value stock options and Employee Stock Purchase Plan (“ESPP”) shares granted pursuant to the Company’s equity incentive plans for the three months ended March 31, 2019 and 2018:
| Three months ended
| March 31, 2019 |  | March 31, 2018
Stock options |  |  |
Expected life, years | 4.5 |  |  | 4.8 |
Expected volatility, % | 33.1 | % |  | 32.2 | %
Risk-free interest rate, % | 2.6 | % |  | 2.6 | %
Estimated forfeiture rate, % | 7.2 | % |  | 6.9 | %
Dividend yield, % | — | % |  | — | %
Employee Stock Purchase Plan, Valuation Assumptions |
| Three months ended
| March 31, 2019 |  | March 31, 2018
Employee stock purchase plan shares |  |  |
Expected life, years | 0.5 - 2.0 |  |  | 0.5 - 2.0 |
Expected volatility, % | 28.2% - 38.4% |  |  | 27.7% - 33.8% |
Risk-free interest rate, % | 1.3% - 2.7% |  |  | 0.7% - 2.3% |
Dividend yield, % | — | % |  | — | %
Stock Option Activity under the Equity Incentive Plans | The following table summarizes the share option activity under the Company’s equity incentive plans during the three months ended March 31, 2019:
| Number of Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Years |  | Aggregate Intrinsic Value
| (In thousands, except per share data)
Outstanding at December 31, 2018 | 3,748 |  |  | $ | 41.27 |  |  | 7.6 |  | $ | 78,365 |
Granted | 292 |  |  | 76.18 |  |  |  |  |
Exercised | (379 | ) |  | 31.83 |  |  |  |  |
Expired | — |  |  | — |  |  |  |  |
Forfeited | (117 | ) |  | 44.18 |  |  |  |  |
Outstanding at March 31, 2019 | 3,544 |  |  | $ | 45.06 |  |  | 7.9 |  | $ | 127,007 |
Exercisable at March 31, 2019 | 1,275 |  |  | $ | 31.24 |  |  | 6.3 |  | $ | 63,241 |
Vested and expected to vest at March 31, 2019 and thereafter | 3,544 |  |  | $ | 45.06 |  |  | 7.9 |  | $ | 127,007 |
Restricted Stock Units Activity under the Equity Incentive Plans | Summaries of the restricted stock activity under the Company’s 2009 Equity Incentive Plan, as amended (the “2009 Plan”) are presented below for the three months ended March 31, 2019:
| 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 |  |  |  |  |  |  |
Outstanding at December 31, 2018 | 538 |  |  | $ | 51.52 |  |  | 1.6 |  | $ | 32,935 |
Granted (Awarded) | 30 |  |  | 78.23 |  |  |  |  |
Vested (Released) | (36 | ) |  | 39.78 |  |  |  |  |
Forfeited | (27 | ) |  | 44.87 |  |  |  |  |
Outstanding and unvested at March 31, 2019 | 505 |  |  | $ | 54.32 |  |  | 1.5 |  | $ | 40,813 |
Restricted Stock Awards Activity under the Equity Incentive Plans |
| Number of Shares |  | Weighted-Average Grant Date Fair Value
| (In thousands, except per share data)
Restricted stock awards |  |  |
Outstanding at December 31, 2018 | 21 |  |  | $ | 46.60 |
Granted (Awarded) | — |  |  | — |
Vested (Released) | — |  |  | — |
Forfeited | — |  |  | — |
Outstanding and unvested at March 31, 2019 | 21 |  |  | $ | 46.60 |
Performance-Based Restricted Stock under the Equity Incentive Plans | A summary of the performance-based restricted stock activity under the 2009 Plan is presented below for the three months ended March 31, 2019:
| Number of Shares |  | Weighted-Average Grant Date Fair Value Per Unit
| (In thousands, except per share data)
Outstanding at December 31, 2018 | 197 |  |  | $ | 34.83 |
Granted | 61 |  |  | 72.02 |
Vested | (26 | ) |  | 38.03 |
Forfeited | (20 | ) |  | 34.37 |
Outstanding and unvested at March 31, 2019 | 212 |  |  | $ | 45.18 |
Shares Reserved for Future Issuance under the Equity Incentive Plans | The Company had the following ordinary shares reserved for future issuance under its equity incentive plans as of March 31, 2019:
| Number of Shares
| (In thousands)
Share options outstanding | 3,544 |
Non-vested restricted share awards | 738 |
Shares authorized for future issuance | 2,140 |
ESPP shares available for future issuance | 1,703 |
Total shares reserved for future issuance | 8,125 |

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