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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 27, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock-Based Compensation Expense | The following table summarizes stock-based compensation expense (in thousands):
| Three months ended |  | Nine months ended
| September 27, 2013 |  | September 28, 2012 |  | September 27, 2013 |  | September 28, 2012
Stock-based compensation in: |  |  |  |  |  |  |
Cost of revenue | $ | 605 |  |  | $ | 659 |  |  | $ | 1,838 |  |  | $ | 2,176 |
Research and development expense | 1,076 |  |  | 1,450 |  |  | 3,400 |  |  | 4,755 |
Selling, general and administrative expense | 2,264 |  |  | 2,388 |  |  | 6,628 |  |  | 6,816 |
Total stock-based compensation in operating expense | 3,340 |  |  | 3,838 |  |  | 10,028 |  |  | 11,571 |
Total stock-based compensation | $ | 3,945 |  |  | $ | 4,497 |  |  | $ | 11,866 |  |  | $ | 13,747 |
Valuation Assumptions for Stock Options | The Company estimated the fair value of all employee stock options using a Black-Scholes valuation model with the following weighted average assumptions:
| Three months ended |  | Nine months ended
| September 27, 2013 |  | September 28, 2012 |  | September 27, 2013 |  | September 28, 2012
Expected term (years) | 4.70 |  |  | 4.70 |  |  | 4.70 |  |  | 4.70 |
Volatility | 46 | % |  | 54 | % |  | 51 | % |  | 56 | %
Risk-free interest rate | 1.5 | % |  | 0.7 | % |  | 0.8 | % |  | 0.9 | %
Expected dividends | 0.0 | % |  | 0.0 | % |  | 0.0 | % |  | 0.0 | %
Employee Stock Purchase Plan | The call option and put option were valued using the Black-Scholes option pricing model with the following assumptions:
| Purchase Period Ending |  | Purchase Period Ending
| June 30, 2013 |  | June 30, 2012 |  | December 31, 2012
Expected term (years) | 0.49 |  |  | 0.50 |  |  | 0.50 |
Volatility | 30 | % |  | 53 | % |  | 46 | %
Risk-free interest rate | 0.2 | % |  | 0.2 | % |  | 0.2 | %
Expected dividends | 0.0 | % |  | 0.0 | % |  | 0.0 | %

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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 significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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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- 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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