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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 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 year ended December 31, 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 | 1,519 |  |  | 41.00 |  |  |  |  |
Exercised | (1,520 | ) |  | 18.14 |  |  |  |  |
Forfeited or expired | (167 | ) |  | 31.94 |  |  |  |  |
Outstanding as of December 31, 2015 | 6,644 |  |  | $ | 28.27 |  |  | 7.11 |  | $ | 57,955 |
Exercisable as of December 31, 2015 | 2,596 |  |  | $ | 17.69 |  |  | 5.31 |  | $ | 43,597 |
Options vested or expected to vest at December 31, 2015 (1) | 6,065 |  |  | $ | 27.29 |  |  | 6.96 |  | $ | 57,291 |
(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:
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Risk-free rate | 2.1 | % |  | 2.6 | % |  | 2.0 | %
Expected dividend yield | 1.25 | % |  | — | % |  | — | %
Expected volatility | 40 | % |  | 41 | % |  | 42 | %
Expected term (in years) | 5.4 |  |  | 5.4 |  |  | 5.8 |
Nonvested Restricted Stock Shares Activity [Table Text Block] | The following table summarizes the Company's restricted stock activity for the year ended December 31, 2015:
| Shares (in thousands) |  | Weighted-Average Grant Fair Value |  | Aggregate Intrinsic Value (in thousands) (1)
Nonvested as of December 31, 2014 | 20 |  |  | $ | 34.05 |  |  |
Granted | — |  |  | — |  |  |
Vested | — |  |  | — |  |  |
Forfeited or expired | — |  |  | — |  |  |
Nonvested as of December 31, 2015 | 20 |  |  | $ | 34.05 |  |  | $ | 675 |
(1) Fair market value as of December 31, 2015.
Stock-Based Compensation Expense | The following table presents the stock-based compensation expense by caption for each period presented on the Consolidated Statements of Operations (in thousands):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Cost of revenue | $ | 1,515 |  |  | $ | 1,116 |  |  | $ | 820 |
Research, development, and engineering | 5,194 |  |  | 3,709 |  |  | 2,502 |
Selling, general, and administrative | 13,032 |  |  | 9,234 |  |  | 6,461 |
Discontinued operations | 1,533 |  |  | 1,099 |  |  | 837 |
| $ | 21,274 |  |  | $ | 15,158 |  |  | $ | 10,620 |

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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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