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Employee Benefit Plans (Tables) | 9 Months Ended
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Oct. 01, 2017
Employee Benefits and Share-based Compensation [Abstract] |
Schedule Of Stock Option Activity | Option Activity Stock option activity during the nine months ended October 1, 2017 was as follows:
| Number of shares |  | Weighted Average Exercise Price Per Share
| (In thousands) |  | (In dollars)
Outstanding as of December 31, 2016 | 1,884 |  |  | $ | 31.14 |
Granted | 328 |  |  | 42.70 |
Exercised | (230 | ) |  | 27.83 |
Cancelled | — |  |  | — |
Expired | (1 | ) |  | 31.70 |
Outstanding as of October 1, 2017 | 1,981 |  |  | $ | 33.44 |
Schedule Of RSU Activity | RSU Activity RSU activity during the nine months ended October 1, 2017 was as follows:
| Number of shares |  | Weighted Average Grant Date Fair Value Per Share
| (In thousands) |  | (In dollars)
Outstanding as of December 31, 2016 | 996 |  |  | $ | 36.22 |
Granted | 553 |  |  | 49.50 |
Vested | (382 | ) |  | 35.13 |
Cancelled | (54 | ) |  | 43.87 |
Outstanding as of October 1, 2017 | 1,113 |  |  | $ | 42.83 |
Schedule Of Valuation And Expense Information | The table below sets forth the weighted average assumptions used to estimate the fair value of option grants and purchase rights granted under the ESPP during the three and nine months ended October 1, 2017 and October 2, 2016.
| Three Months Ended |  | Nine Months Ended
| Stock Options |  | ESPP |  | Stock Options |  | ESPP
| October 1, 2017 |  | October 2, 2016 |  | October 1, 2017 |  | October 2, 2016 |  | October 1, 2017 |  | October 2, 2016 |  | October 1, 2017 |  | October 2, 2016
Expected life (in years) | NA |  | NA |  | 0.5 |  |  | 0.5 |  |  | 4.4 |  |  | 4.4 |  |  | 0.5 |  |  | 0.5 |
Risk-free interest rate | NA |  | NA |  | 1.12 | % |  | 0.45 | % |  | 1.65 | % |  | 1.28 | % |  | 0.93 | % |  | 0.43 | %
Expected volatility | NA |  | NA |  | 31.3 | % |  | 28.6 | % |  | 31.6 | % |  | 35.4 | % |  | 29.7 | % |  | 38.3 | %
Dividend yield | NA |  | NA |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Schedule Of Total Stock-Based Compensation Expense Resulting From Stock Options, Restricted Stock Awards, And The Employee Stock Purchase Plan | The following table sets forth the stock-based compensation expense resulting from stock options, RSUs and the ESPP included in the Company’s unaudited condensed consolidated statements of operations:
| Three Months Ended |  | Nine Months Ended
| October 1, 2017 |  | October 2, 2016 |  | October 1, 2017 |  | October 2, 2016
| (In thousands)
Cost of revenue | $ | 499 |  |  | $ | 426 |  |  | $ | 1,477 |  |  | $ | 1,316 |
Research and development | 1,056 |  |  | 1,087 |  |  | 3,748 |  |  | 3,071 |
Sales and marketing | 1,654 |  |  | 1,300 |  |  | 4,339 |  |  | 3,835 |
General and administrative | 2,374 |  |  | 2,057 |  |  | 6,848 |  |  | 6,078 |
Total stock-based compensation | $ | 5,583 |  |  | $ | 4,870 |  |  | $ | 16,412 |  |  | $ | 14,300 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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