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Equity and Stock Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumption of stock option's fair value |
| Three Months Ended |  | Nine Months Ended
| September 28, 2013 |  | September 29, 2012 |  | September 28, 2013 |  | September 29, 2012
Stock Options |  |  |  |  |  |  |
Expected life | 4.6 years |  |  | 4.6 years |  |  | 4.5 years |  |  | 4.5 years |
Volatility | 64.38 | % |  | 75.44 | % |  | 71.04 | % |  | 77.96 | %
Risk free interest rate | 1.52 | % |  | 0.74 | % |  | 1.00 | % |  | 0.84 | %
Dividends | — |  |  | — |  |  | — |  |  | — |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Expected life | 0.5 years |  |  | 0.5 years |  |  | 0.5 years |  |  | 0.5 years |
Volatility | 25.94 | % |  | 38.58 | % |  | 26.75 | % |  | 45.47 | %
Risk free interest rate | 0.10 | % |  | 0.16 | % |  | 0.11 | % |  | 0.12 | %
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 |  | Nine Months Ended
| September 28, 2013 |  | September 29, 2012 |  | September 28, 2013 |  | September 29, 2012
Cost of products | $ | 55 |  |  | $ | 50 |  |  | $ | 153 |  |  | $ | 128 |
Cost of service | 74 |  |  | 62 |  |  | 204 |  |  | 195 |
Research and development | 412 |  |  | 289 |  |  | 1,092 |  |  | 952 |
Selling | 476 |  |  | 451 |  |  | 1,418 |  |  | 1,374 |
General and administrative | 789 |  |  | 630 |  |  | 2,149 |  |  | 1,886 |
Restructuring | 896 |  |  | — |  |  | 896 |  |  | — |
Total stock-based compensation expense | $ | 2,702 |  |  | $ | 1,482 |  |  | $ | 5,912 |  |  | $ | 4,535 |
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 nine month period ended September 28, 2013, 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 29, 2012 | 2,020,319 |  |  | $ | 12.01 |  |  | 4.44 |  |  | $ | 6,770 |
Exercised | (218,474 | ) |  | 7.46 |  |  |  |  |
Granted | 374,700 |  |  | 15.22 |  |  |  |  |
Cancelled | (121,881 | ) |  | 15.10 |  |  |  |  |
Outstanding at September 28, 2013 | 2,054,664 |  |  | $ | 12.90 |  |  | 4.28 |  |  | $ | 7,158 |
Exercisable at September 28, 2013 | 1,258,894 |  |  | $ | 11.43 |  |  | 3.49 |  |  | $ | 6,150 |
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 nine month period ended September 28, 2013, is as follows:
| Number of RSUs |  | Weighted Average Fair Value
Outstanding RSU as of December 29, 2012 | 235,162 |  |  | $ | 16.32 |
Granted | 292,360 |  |  | 15.41 |
Released | (85,707 | ) |  | 15.55 |
Cancelled | (9,518 | ) |  | 14.41 |
Outstanding RSU as of September 28, 2013 | 432,297 |  |  | $ | 16.05 |

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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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