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Employee Benefits and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
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, |  |  |  |
| 2019 |  | 2018 |  | 2017
| (In thousands) |  |  |  |
Cost of product and service revenues | $ | 5,648 |  |  | $ | 4,634 |  |  | $ | 3,478 |
Research and development | 6,604 |  |  | 5,746 |  |  | 3,590 |
Selling, general, and administrative | 21,797 |  |  | 18,505 |  |  | 14,789 |
Total share-based compensation expense | $ | 34,049 |  |  | $ | 28,885 |  |  | $ | 21,857 |
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, 2019, 2018, and 2017:
| Year Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Stock options |  |  |  |  |
Expected life, years | 4.4 |  | 4.8 |  | 4.7
Expected volatility, % | 33.7 | % |  | 31.1 | % |  | 29.6 | %
Risk-free interest rate, % | 2.0 | % |  | 2.8 | % |  | 1.9 | %
Estimated forfeiture rate, % | 7.2 | % |  | 6.9 | % |  | 7.7 | %
Dividend yield, % | — | % |  | — | % |  | — | %
Assumptions Used to Value ESPP Shares Granted |
| Year Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Employee stock purchase plan shares |  |  |  |  |
Expected life, years | 0.5 - 2.0 |  | 0.5 - 2.0 |  | 0.5 - 2.0
Expected volatility, % | 28.2% - 39.9% |  | 28.1% - 33.8% |  | 25.8% - 32.8%
Risk-free interest rate, % | 1.3% - 2.7% |  | 0.8% - 2.7% |  | 0.5% - 1.4%
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, 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 | 1,169 |  |  | 76.44 |  |  |  |  |
Exercised | (744) |  |  | 33.83 |  |  |  |  |
Expired | (10) |  |  | 37.79 |  |  |  |  |
Forfeited | (261) |  |  | 48.57 |  |  |  |  |
Outstanding at December 31, 2019 | 3,902 |  |  | $ | 52.75 |  |  | 7.7 |  | $ | 113,198 |
Exercisable at December 31, 2019 | 1,580 |  |  | $ | 36.48 |  |  | 6.2 |  | $ | 71,485 |
Vested and expected to vest at December 31, 2019 and thereafter | 3,677 |  |  | $ | 51.83 |  |  | 7.7 |  | $ | 110,048 |
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, 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) | 277 |  |  | 78.49 |  |  |  |  |
Vested (Released) | (216) |  |  | 48.88 |  |  |  |  |
Forfeited | (55) |  |  | 48.40 |  |  |  |  |
Outstanding and unvested at December 31, 2019 | 544 |  |  | $ | 66.65 |  |  | 1.6 |  | $ | 44,492 |
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, 2018 | 21 |  |  | $ | 46.60 |  |  |  |  |  |  |  |
Granted (Awarded) | 17 |  |  | 81.86 |  |  |  |  |  |  |  |
Vested (Released) | (21) |  |  | 46.96 |  |  |  |  |  |  |  |
Outstanding and unvested at December 31, 2019 | 17 |  |  | $ | 81.92 |  |  |  |  |  |  |  |
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, 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 | 71 |  |  | 73.38 |
Vested | (101) |  |  | 34.37 |
Forfeited | (33) |  |  | 33.84 |
Outstanding and unvested at December 31, 2019 | 134 |  |  | $ | 55.82 |
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, 2019:
| Number of Shares
| (In thousands)
Share options outstanding | 3,902 |
Non-vested restricted stock awards | 696 |
Shares authorized for future issuance | 2,873 |
ESPP shares available for future issuance | 1,539 |
Total shares reserved for future issuance |  | 9,010 |

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