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Employee Benefits and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Share-Based Compensation Expense | The following table sets forth the total share-based compensation expense recognized in the Company’s Consolidated Statements of Operations:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (In thousands)
Cost of product and service revenues | $ | 7,469 |  |  | $ | 5,648 |  |  | $ | 4,634 |
Research and development | 6,497 |  |  | 6,604 |  |  | 5,746 |
Selling, general, and administrative | 30,731 |  |  | 21,797 |  |  | 18,505 |
Total share-based compensation expense | $ | 44,697 |  |  | $ | 34,049 |  |  | $ | 28,885 |
Assumptions Used to Value Stock Options Granted | The following assumptions were used to value stock options and ESPP shares granted pursuant to the Company’s equity incentive plans for the years ended December 31, 2020, 2019, and 2018:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Stock options |  |  |  |  |
Expected life, years | 4.7 |  | 4.4 |  | 4.8
Expected volatility, % | 39.4 | % |  | 33.7 | % |  | 31.1 | %
Risk-free interest rate, % | 0.7 | % |  | 2.0 | % |  | 2.8 | %
Estimated forfeiture rate, % | 5.7 | % |  | 7.2 | % |  | 6.9 | %
Dividend yield, % | — | % |  | — | % |  | — | %
Assumptions Used to Value ESPP Shares Granted |
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Employee stock purchase plan shares |  |  |  |  |
Expected life, years | 0.5 - 2.0 |  | 0.5 - 2.0 |  | 0.5 - 2.0
Expected volatility, % | 30.4% - 53.5% |  | 28.2% - 39.9% |  | 28.1% - 33.8%
Risk-free interest rate, % | 0.1% - 2.7% |  | 1.3% - 2.7% |  | 0.8% - 2.7%
Dividend yield, % | — | % |  | — | % |  | — | %
Summary of Share Option Activity | The following table summarizes the share option activity under the Company’s 2009 Plan during the year ended December 31, 2020:
| Number of Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Years |  | Aggregate Intrinsic Value
| (In thousands, except per share data)
Outstanding at December 31, 2019 | 3,902 |  |  | $ | 52.75 |  |  | 7.7 |  | $ | 113,198 |
Granted | 1,351 |  |  | 78.83 |  |  |  |  |
Exercised | (891) |  |  | 42.67 |  |  |  |  |
Expired | (19) |  |  | 59.65 |  |  |  |  |
Forfeited | (411) |  |  | 66.65 |  |  |  |  |
Outstanding at December 31, 2020 | 3,932 |  |  | $ | 62.50 |  |  | 7.8 |  | $ | 226,160 |
Exercisable at December 31, 2020 | 1,556 |  |  | $ | 45.49 |  |  | 6.2 |  | $ | 115,949 |
Vested and expected to vest at December 31, 2020 and thereafter | 3,755 |  |  | $ | 61.86 |  |  | 7.7 |  | $ | 218,379 |
Summary of Restricted Stock Unit Activity | Summaries of the restricted stock activity under the 2009 Plan are presented below for the year ended December 31, 2020:
| 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, 2019 | 544 |  |  | $ | 66.65 |  |  | 1.6 |  | $ | 44,492 |
Granted (Awarded) | 343 |  |  | 74.52 |  |  |  |  |
Vested (Released) | (183) |  |  | 61.30 |  |  |  |  |
Forfeited | (124) |  |  | 67.16 |  |  |  |  |
Outstanding and unvested at December 31, 2020 | 580 |  |  | $ | 72.87 |  |  | 1.6 |  | $ | 69,670 |
Summary of Restricted Stock Awards Activity |
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |
| (In thousands, except per share data)
Restricted stock awards |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2019 | 17 |  |  | $ | 81.92 |  |  |  |  |  |  |  |
Granted (Awarded) | 21 |  |  | 68.11 |  |  |  |  |  |  |  |
Vested (Released) | (17) |  |  | 81.92 |  |  |  |  |  |  |  |
Outstanding and unvested at December 31, 2020 | 21 |  |  | $ | 68.11 |  |  |  |  |  |  |  |
Summary of Performance-Based Restricted Stock Activity | A summary of the performance-based restricted stock activity under the 2009 Plan is presented below for the year ended December 31, 2020:
| Number of Shares |  | Weighted-Average Grant Date Fair Value Per Unit
| (In thousands, except per share data)
Outstanding at December 31, 2019 | 134 |  |  | $ | 55.82 |
Granted | 99 |  |  | 82.17 |
Vested | (73) |  |  | 50.54 |
Forfeited | (5) |  |  | 81.72 |
Outstanding and unvested at December 31, 2020 | 155 |  |  | $ | 74.26 |
Ordinary Shares Reserved for Future Issuance Under Equity Incentive Plans | The Company had the following ordinary shares reserved for future issuance under its equity incentive plans as of December 31, 2020:
| Number of Shares
| (In thousands)
Share options outstanding | 3,932 |
Non-vested restricted stock awards | 756 |
Shares authorized for future issuance | 1,250 |
ESPP shares available for future issuance | 1,206 |
Total shares reserved for future issuance | 7,144 |

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