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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 26, 2014
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 26, 2014 |  | September 27, 2013 |  | September 26, 2014 |  | September 27, 2013
Stock-based compensation in: |  |  |  |  |  |  |
Cost of revenue | $ | 612 |  |  | $ | 605 |  |  | $ | 1,751 |  |  | $ | 1,838 |
Research and development expense | 1,219 |  |  | 1,076 |  |  | 3,589 |  |  | 3,400 |
Selling, general and administrative expense | 2,521 |  |  | 2,264 |  |  | 7,380 |  |  | 6,628 |
Total stock-based compensation in operating expense | 3,740 |  |  | 3,340 |  |  | 10,969 |  |  | 10,028 |
Total stock-based compensation | $ | 4,352 |  |  | $ | 3,945 |  |  | $ | 12,720 |  |  | $ | 11,866 |
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 26, 2014 |  | September 27, 2013 |  | September 26, 2014 |  | September 27, 2013
Expected term (years) | 4.70 |  |  | 4.70 |  |  | 4.70 |  |  | 4.70 |
Volatility | 40 | % |  | 46 | % |  | 40 | % |  | 51 | %
Risk-free interest rate | 1.8 | % |  | 1.5 | % |  | 1.7 | % |  | 0.8 | %
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. The weighted average fair value of the Company's ESPP shares at purchase dates was estimated using the following weighted average assumptions during the nine months ended September 26, 2014 and September 27, 2013:
| Purchase Period Ending
| December 31, 2014 |  | June 30, 2014 |  | June 30, 2013
Expected term (years) | 0.50 |  |  | 0.50 |  |  | 0.49 |
Volatility | 33 | % |  | 28 | % |  | 30 | %
Risk-free interest rate | 0.1 | % |  | 0.1 | % |  | 0.2 | %
Expected dividends | 0.0 | % |  | 0.0 | % |  | 0.0 | %
Estimated weighted average fair value per share at purchase date | $1.84 |  | $1.70 |  | $1.23

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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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