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Employee Benefits and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
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,
| 2021 |  | 2020 |  | 2019
| (In thousands)
Cost of product and service revenues | $ | 7,994 |  |  | $ | 7,469 |  |  | $ | 5,648 |
Research and development | 7,663 |  |  | 6,497 |  |  | 6,604 |
Selling, general, and administrative | 37,503 |  |  | 30,731 |  |  | 21,797 |
Total share-based compensation expense | $ | 53,160 |  |  | $ | 44,697 |  |  | $ | 34,049 |
Assumptions Used to Value ESPP Shares | The following assumptions were used to value shares granted under the ESPP for the years ended December 31, 2021, 2020, and 2019:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Expected life, years | 0.5 - 2.0 |  | 0.5 - 2.0 |  | 0.5 - 2.0
Expected volatility, % | 27.4% - 53.5% |  | 30.4% - 53.5% |  | 28.2% - 39.9%
Risk-free interest rate, % | 0.1% - 2.6% |  | 0.1% - 2.7% |  | 1.3% - 2.7%
Dividend yield, % | — | % |  | — | % |  | — | %
Assumptions Used to Value Stock Options Granted | The following assumptions were used to value stock options granted pursuant to the 2009 Plan for the years ended December 31, 2021, 2020, and 2019:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Expected life, years | 4.9 |  | 4.7 |  | 4.4
Expected volatility, % | 31.5 | % |  | 39.4 | % |  | 33.7 | %
Risk-free interest rate, % | 0.9 | % |  | 0.7 | % |  | 2.0 | %
Estimated forfeiture rate, % | 7.9 | % |  | 5.7 | % |  | 7.2 | %
Dividend yield, % | — | % |  | — | % |  | — | %
Summary of Share Option Activity | The following table summarizes the stock option activity under the 2009 Plan during the year ended December 31, 2021:
| Number of Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Years |  | Aggregate Intrinsic Value
| (In thousands, except per share data)
Outstanding at December 31, 2020 | 3,932 |  |  | $ | 62.50 |  |  | 7.8 |  | $ | 226,160 |
Granted | 160 |  |  | 129.21 |  |  |  |  |
Exercised | (901) |  |  | 54.99 |  |  |  |  |
Expired | (14) |  |  | 62.58 |  |  |  |  |
Forfeited | (223) |  |  | 76.57 |  |  |  |  |
Outstanding at December 31, 2021 | 2,954 |  |  | $ | 67.35 |  |  | 6.9 |  | $ | 334,119 |
Exercisable at December 31, 2021 | 1,636 |  |  | $ | 55.13 |  |  | 6.0 |  | $ | 204,949 |
Vested and expected to vest at December 31, 2021 and thereafter | 2,845 |  |  | $ | 66.67 |  |  | 6.9 |  | $ | 323,666 |
Summary of Restricted Stock Unit Activity | The following table summarizes the RSU activity under the 2009 Plan during the year ended December 31, 2021:
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Years |  | Aggregate Intrinsic Value
| (In thousands, except per share data)
Outstanding at December 31, 2020 | 580 |  |  | $ | 72.87 |  |  | 1.6 |  | $ | 69,670 |
Granted (Awarded) | 481 |  |  | 149.65 |  |  |  |  |
Vested (Released) | (224) |  |  | 74.50 |  |  |  |  |
Forfeited | (74) |  |  | 81.79 |  |  |  |  |
Outstanding and unvested at December 31, 2021 | 763 |  |  | $ | 119.93 |  |  | 1.6 |  | $ | 137,696 |
Summary of Restricted Stock Awards Activity | The following table summarizes the RSA activity under the 2009 Plan during the year ended December 31, 2021:
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |
| (In thousands, except per share data)
Outstanding at December 31, 2020 | 21 |  |  | $ | 68.11 |  |  |  |  |  |  |  |
Granted (Awarded) | 11 |  |  | 137.36 |  |  |  |  |  |  |  |
Vested (Released) | (21) |  |  | 68.11 |  |  |  |  |  |  |  |
Outstanding and unvested at December 31, 2021 | 11 |  |  | $ | 137.36 |  |  |  |  |  |  |  |
Summary of Performance-Based Restricted Stock Activity | The following table summarizes the PSU activity under the 2009 Plan during the year ended December 31, 2021:
| Number of Shares |  | Weighted-Average Grant Date Fair Value Per Unit
| (In thousands, except per share data)
Outstanding at December 31, 2020 | 155 |  |  | $ | 74.26 |
Granted | 68 |  |  | 162.16 |
Vested | (66) |  |  | 67.66 |
Forfeited | (13) |  |  | 72.89 |
Outstanding and unvested at December 31, 2021 | 144 |  |  | $ | 118.71 |
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, 2021:
| Number of Shares
| (In thousands)
Share options outstanding | 2,954 |
Non-vested restricted stock awards | 918 |
Shares authorized for future issuance | 1,637 |
ESPP shares available for future issuance | 919 |
Total shares reserved for future issuance | 6,428 |

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