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Stock-Based Compensation Expense (Tables) | 6 Months Ended
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Jul. 05, 2015
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 six-month period ended July 5, 2015:
| Shares (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2014 | 6,812 |  |  | $ | 23.26 |  |  |  |  |
Granted | 1,427 |  |  | 41.36 |  |  |  |  |
Exercised | (1,280 | ) |  | 16.76 |  |  |  |  |
Forfeited or expired | (43 | ) |  | 8.68 |  |  |  |  |
Outstanding as of July 5, 2015 | 6,916 |  |  | $ | 28.14 |  |  | 7.4 |  | $ | 136,975 |
Exercisable as of July 5, 2015 | 2,533 |  |  | $ | 16.74 |  |  | 5.6 |  | $ | 79,074 |
Options vested or expected to vest as of July 5, 2015 (1) | 6,140 |  |  | $ | 26.97 |  |  | 7.2 |  | $ | 128,812 |
(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 |  | Six-months Ended
| July 5, 2015 |  | June 29, 2014 |  | July 5, 2015 |  | June 29, 2014
Risk-free rate | 2.1 | % |  | 2.7 | % |  | 2.1 | % |  | 2.7 | %
Expected dividend yield | 1.25 | % |  | — | % |  | 1.25 | % |  | — | %
Expected volatility | 40 | % |  | 41 | % |  | 40 | % |  | 41 | %
Expected term (in years) | 5.4 |  |  | 5.4 |  |  | 5.4 |  |  | 5.4 |
Nonvested Restricted Stock Shares Activity | The following table summarizes the Company's restricted stock award activity:
| Shares (in thousands) |  | Weighted-Average Exercise Price |  | Aggregate Intrinsic Value (in thousands)
Nonvested as of December 31, 2014 | 20 |  |  | $ | 34.05 |  |  |
Granted | — |  |  | — |  |  |
Vested | — |  |  | — |  |  |
Forfeited or expired | — |  |  | — |  |  |
Nonvested as of July 5, 2015 | 20 |  |  | $ | 34.05 |  |  | $ | 278 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | 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 |  | Six-months Ended
| July 5, 2015 |  | June 29, 2014 |  | July 5, 2015 |  | June 29, 2014
Cost of revenue | $ | 349 |  |  | $ | 286 |  |  | $ | 816 |  |  | $ | 613 |
Research, development, and engineering | 1,153 |  |  | 949 |  |  | 2,967 |  |  | 1,967 |
Selling, general, and administrative | 2,985 |  |  | 2,473 |  |  | 7,367 |  |  | 4,825 |
Discontinued operations | 144 |  |  | 248 |  |  | 427 |  |  | 555 |
| $ | 4,631 |  |  | $ | 3,956 |  |  | $ | 11,577 |  |  | $ | 7,960 |
Upon the sale of the Company's Surface Inspection Systems Division to AMETEK, Inc., completed on July 6, 2015, as more fully described in Note 16 to the Consolidated Financial Statements, the Company accelerated the vesting of stock options, with respect to 171,000 underlying shares, resulting in an additional $1,105,000 of stock option expense in the third quarter of 2015.

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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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