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Equity and Stock Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumption of stock option's fair value |
| Three Months Ended |  | Six Months Ended
| June 29, 2013 |  | June 30, 2012 |  | June 29, 2013 |  | June 30, 2012
Stock Options |  |  |  |  |  |  |
Expected life | 4.6 years |  |  | 4.2 years |  |  | 4.5 years |  |  | 4.5 years |
Volatility | 68.90 | % |  | 78.65 | % |  | 72.32 | % |  | 78.23 | %
Risk free interest rate | 1.02 | % |  | 0.74 | % |  | 0.90 | % |  | 0.85 | %
Dividends | — |  |  | — |  |  | — |  |  | — |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Expected life | 0.5 years |  |  | 0.5 years |  |  | 0.5 years |  |  | 0.5 years |
Volatility | 25.94 | % |  | 55.93 | % |  | 27.61 | % |  | 62.74 | %
Risk free interest rate | 0.10 | % |  | 0.06 | % |  | 0.11 | % |  | 0.06 | %
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 were as follows (in thousands):
| Three Months Ended |  | Six Months Ended
| June 29, 2013 |  | June 30, 2012 |  | June 29, 2013 |  | June 30, 2012
Cost of products | $ | 53 |  |  | $ | 20 |  |  | $ | 98 |  |  | $ | 77 |
Cost of service | 71 |  |  | 75 |  |  | 130 |  |  | 133 |
Research and development | 362 |  |  | 347 |  |  | 679 |  |  | 666 |
Selling | 501 |  |  | 481 |  |  | 941 |  |  | 922 |
General and administrative | 764 |  |  | 670 |  |  | 1,360 |  |  | 1,256 |
Total stock-based compensation expense | $ | 1,751 |  |  | $ | 1,593 |  |  | $ | 3,208 |  |  | $ | 3,054 |
Changes in accumulated other comprehensive income by component | The following table shows a summary of changes in accumulated other comprehensive income by component for the six months ended June 29, 2013 (in thousands):
| Defined Benefit Pension Plans |  | Foreign Currency Translations |  | Unrealized Gain (Loss) on Investment |  | Total
Balance as of December 29, 2012 | $ | (179 | ) |  | $ | 1,453 |  |  | $ | (2 | ) |  | $ | 1,272 |
Other comprehensive income | — |  |  | (1,979 | ) |  | (3 | ) |  | (1,982 | )
Balance as of June 29, 2013 | $ | (179 | ) |  | $ | (526 | ) |  | $ | (5 | ) |  | $ | (710 | )
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 six month period ended June 29, 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 | (181,617 | ) |  | 7.15 |  |  |  |  |
Granted | 314,100 |  |  | 15.31 |  |  |  |  |
Cancelled | (67,037 | ) |  | 14.63 |  |  |  |  |
Outstanding at June 29, 2013 | 2,085,765 |  |  | $ | 12.85 |  |  | 4.35 |  |  | $ | 5,757 |
Exercisable at June 29, 2013 | 1,234,828 |  |  | $ | 11.25 |  |  | 3.56 |  |  | $ | 5,127 |
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 six month period ended June 29, 2013, is as follows:
| Number of RSUs |  | Weighted Average Fair Value
Outstanding RSU as of December 29, 2012 | 235,162 |  |  | $ | 16.32 |
Granted | 286,060 |  |  | 15.43 |
Released | (29,739 | ) |  | 14.62 |
Cancelled | (8,518 | ) |  | 14.27 |
Outstanding RSU as of June 29, 2013 | 482,965 |  |  | $ | 14.67 |

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