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Stockholders' Equity and Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 26, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock options valuation assumptions |
| Three Months Ended |  | Nine Months Ended
| September 26, 2015 |  | September 27, 2014 |  | September 26, 2015 |  | September 27, 2014
Stock Options: |  |  |  |  |  |  |
Expected life | — |  |  | — |  |  | — |  |  | 4.6 years
Volatility | — |  |  | — |  |  | — |  |  | 54.9%
Risk free interest rate | — |  |  | — |  |  | — |  |  | 1.54%
Dividends | — |  |  | — |  |  | — |  |  | —
Employee Stock Purchase Plan: |  |  |  |  |  |  |
Expected life | 0.5 years |  | 0.5 years |  | 0.5 years |  | 0.5 years
Volatility | 36.7% |  | 29.6% |  | 36.9% |  | 32.6%
Risk free interest rate | 0.13% |  | 0.06% |  | 0.12% |  | 1.00%
Dividends | — |  | — |  | — |  | —
Employee stock purchase plan valuation assumptions |
| Three Months Ended |  | Nine Months Ended
| September 26, 2015 |  | September 27, 2014 |  | September 26, 2015 |  | September 27, 2014
Stock Options: |  |  |  |  |  |  |
Expected life | — |  |  | — |  |  | — |  |  | 4.6 years
Volatility | — |  |  | — |  |  | — |  |  | 54.9%
Risk free interest rate | — |  |  | — |  |  | — |  |  | 1.54%
Dividends | — |  |  | — |  |  | — |  |  | —
Employee Stock Purchase Plan: |  |  |  |  |  |  |
Expected life | 0.5 years |  | 0.5 years |  | 0.5 years |  | 0.5 years
Volatility | 36.7% |  | 29.6% |  | 36.9% |  | 32.6%
Risk free interest rate | 0.13% |  | 0.06% |  | 0.12% |  | 1.00%
Dividends | — |  | — |  | — |  | —
Stock option plans activity | A summary of activity of stock options during the nine months ended September 26, 2015 is as follows:
| Number of Shares Outstanding (Options) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in Thousands)
Options |  |  |  |  |  |  |
Outstanding at December 27, 2014 | 1,382,993 |  |  | $ | 13.92 |  |  | 3.41 |  | $ | 4,108 |
Exercised | (191,037 | ) |  | 9.86 |  |  |  |  |
Cancelled | (72,527 | ) |  | 17.22 |  |  |  |  |
Outstanding at September 26, 2015 | 1,119,429 |  |  | $ | 14.40 |  |  | 2.63 |  | $ | 925 |
Exercisable at September 26, 2015 | 948,053 |  |  | $ | 14.07 |  |  | 2.28 |  | $ | 925 |
Summary of activity for RSUs | A summary of activity for RSUs is as follows:
RSUs | Number of RSUs |  | Weighted Average Fair Value
Outstanding RSUs as of December 27, 2014 | 563,337 |  |  | $ | 17.90 |
Granted | 448,299 |  |  | 15.64 |
Released | (223,143 | ) |  | 16.70 |
Cancelled | (59,655 | ) |  | 17.10 |
Outstanding RSUs as of September 26, 2015 | 728,838 |  |  | $ | 16.02 |
PSUs valuation assumptions | The assumptions for the valuation of PSUs are summarized as follows:
| 2015 Award
Number of PSUs granted and outstanding as of September 26, 2015 | 40,000 |
Grant Date Fair Value Per Share | $ | 18.35 |
Weighted-average assumptions/inputs: |
Expected Dividend | —
Range of risk-free interest rates | 0.25%-1.1%
Range of expected volatilities for peer group | 23%-65%
Stock-based compensation expense for all share-based payment awards | Stock-based compensation expense for all share-based payment awards made to the Company’s employees and directors pursuant to the employee stock option and employee stock purchase plans by function were as follows (in thousands):
| Three Months Ended |  | Nine Months Ended
| September 26, 2015 |  | September 27, 2014 |  | September 26, 2015 |  | September 27, 2014
Cost of products | $ | 96 |  |  | $ | 70 |  |  | $ | 229 |  |  | $ | 199 |
Cost of service | 104 |  |  | 53 |  |  | 195 |  |  | 227 |
Research and development | 300 |  |  | 331 |  |  | 796 |  |  | 967 |
Selling | 511 |  |  | 490 |  |  | 1,403 |  |  | 1,353 |
General and administrative | 671 |  |  | 761 |  |  | 2,041 |  |  | 2,369 |
Total stock-based compensation expense | $ | 1,682 |  |  | $ | 1,705 |  |  | $ | 4,664 |  |  | $ | 5,115 |

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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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