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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 29, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock-Based Compensation Expense | The following table summarizes stock-based compensation expense (in thousands):
|  | Three months ended |
|  | March 29, 2013 |  |  | March 30, 2012 |
Stock-based compensation in: |  |  |  |  |  |  |  |
Cost of revenue |  | $ | 611 |  |  | $ | 753 |
Research and development expense |  |  | 1,203 |  |  |  | 1,655 |
Selling, general and administrative expense |  |  | 2,085 |  |  |  | 2,259 |
Total stock-based compensation in operating expense |  |  | 3,288 |  |  |  | 3,914 |
Total stock-based compensation |  | $ | 3,899 |  |  | $ | 4,667 |
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 |
|  | March 29, 2013 |  |  | March 30, 2012 |
Expected term (years) |  |  | 4.70 |  |  |  | 4.70 |
Volatility |  |  | 52 | % |  |  | 58 | %
Risk-free interest rate |  |  | 0.8 | % |  |  | 1.0 | %
Expected dividends |  |  | 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:
|  | Three months ended |
|  | March 29, 2013 |  |  | March 30, 2012 |
Expected term (years) |  |  | 0.49 |  |  |  | 0.50 |
Volatility |  |  | 32 | % |  |  | 53 | %
Risk-free interest rate |  |  | 0.2 | % |  |  | 0.2 | %
Expected dividends |  |  | 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 3: 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 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: 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=6793087&loc=d3e301413-122809 + 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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