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Equity and Stock Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 29, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumption of stock option's fair value | The fair value of each option award is estimated on the date of grant using the Black-Scholes valuation model and the assumptions noted in the following table. The expected life of options granted was calculated using the simplified method. The risk-free rate is based on the U.S. Treasury rates in effect during the corresponding period of grant. The expected volatility is based on the historical volatility of the Company's stock price. The dividend yield reflects that the Company has not paid any cash dividends since inception and does not intend to pay any cash dividends in the foreseeable future.
| Three Months Ended
| March 29, 2014 |  | March 30, 2013
Stock Options |  |  |
Expected life | 4.6 years |  |  | 4.5 years |
Expected volatility | 56.79 | % |  | 73.12 | %
Risk-free interest rate | 1.53 | % |  | 0.86 | %
Dividends | — |  |  | — |
Employee Stock Purchase Plan |  |  |
Expected life | 0.5 years |  |  | 0.5 years |
Expected volatility | 32.60 | % |  | 27.61 | %
Risk-free interest rate | 1.00 | % |  | 0.11 | %
Dividends | — |  |  | — |
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 was as follows (in thousands):
| Three Months Ended
| March 29, 2014 |  | March 30, 2013
Cost of products | $ | 61 |  |  | $ | 45 |
Cost of service | 84 |  |  | 59 |
Research and development | 340 |  |  | 317 |
Selling | 427 |  |  | 440 |
General and administrative | 722 |  |  | 596 |
Total stock-based compensation expense | $ | 1,634 |  |  | $ | 1,457 |
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock option plans activity | A summary of activity under the Company’s stock option plans during the three month period ended March 29, 2014 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 28, 2013 | 1,909,039 |  |  | $ | 13.22 |  |  | 4.02 |  |  | $ | 10,341 |
Exercised | (217,848 | ) |  | 10.64 |  |  |  |  |
Granted | 44,300 |  |  | 18.28 |  |  |  |  |
Cancelled | (34,342 | ) |  | 15.49 |  |  |  |  |
Outstanding at March 29, 2014 | 1,701,149 |  |  | $ | 13.64 |  |  | 4.03 |  |  | $ | 8,510 |
Exercisable at March 29, 2014 | 1,069,675 |  |  | $ | 12.31 |  |  | 3.18 |  |  | $ | 6,772 |
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock option plans activity | A summary of activity for RSUs during the three month period ended March 29, 2014 is as follows:
| Number of RSUs |  | Weighted Average Fair Value
Outstanding RSUs as of December 28, 2013 | 334,444 |  |  | $ | 18.61 |
Granted | 189,000 |  |  | $ | 18.68 |
Released | (91,817 | ) |  | $ | 18.61 |
Cancelled | (8,073 | ) |  | $ | 18.43 |
Outstanding RSUs as of March 29, 2014 | 423,554 |  |  | $ | 18.61 |

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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 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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- 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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