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Stock-Based Compensation Expense (Tables) | 3 Months Ended
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Mar. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity for the three-month period ended March 30, 2014:
| Shares (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2013 | 6,138 |  |  | $ | 15.65 |  |  |  |  |
Granted | 1,206 |  |  | 39.31 |  |  |  |  |
Exercised | (396 | ) |  | 15.02 |  |  |  |  |
Forfeited or expired | (73 | ) |  | 18.02 |  |  |  |  |
Outstanding as of March 30, 2014 | 6,875 |  |  | $ | 19.80 |  |  | 7.4 |  | $ | 98,435 |
Exercisable as of March 30, 2014 | 2,481 |  |  | $ | 13.59 |  |  | 5.8 |  | $ | 48,212 |
Options vested or expected to vest at March 30, 2014 (1) | 6,130 |  |  | $ | 18.93 |  |  | 7.2 |  | $ | 92,123 |
(1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.
Weighted-Average Assumptions Used in Estimating Fair Values of Stock Options Granted | The fair values of stock options granted in each period presented were estimated using the following weighted-average assumptions:
| Three-months Ended
| March 30, 2014 |  | March 31, 2013
Risk-free rate | 2.7 | % |  | 2.1 | %
Expected dividend yield | — | % |  | — | %
Expected volatility | 41 | % |  | 42 | %
Expected term (in years) | 5.4 |  |  | 5.9 |
Stock-Based Compensation Expense | The following table details the stock-based compensation expense by caption for each period presented on the Consolidated Statements of Operations (in thousands):
| Three-months Ended
| March 30, 2014 |  | March 31, 2013
Product cost of revenue | $ | 285 |  |  | $ | 227 |
Service cost of revenue | 63 |  |  | 63 |
Research, development, and engineering | 1,056 |  |  | 813 |
Selling, general, and administrative | 2,600 |  |  | 2,195 |
| $ | 4,004 |  |  | $ | 3,298 |

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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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: 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 + 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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