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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumption of stock option's fair value | The weighted-average fair value calculations are based on the following average assumptions:
| Fiscal Year 2013 |  | Fiscal Year 2012 |  | Fiscal Year 2011
Stock Options: |  |  |  |  |
Expected life | 4.5 years |  | 4.5 years |  | 4.5 years
Volatility | 69.9% |  | 77.3% |  | 77.0%
Risk free interest rate | 1.05% |  | 0.80% |  | 1.82%
Dividends | — |  | — |  | —
Employee Stock Purchase Plan: |  |  |  |  |
Expected life | 0.5 years |  | 0.5 years |  | 0.5 years
Volatility | 26.8% |  | 45.5% |  | 73.4%
Risk free interest rate | 0.11% |  | 0.12% |  | 0.19%
Dividends | — |  | — |  | —
Significant ranges of outstanding and exercisable options | The following table summarizes ranges of outstanding and exercisable options as of December 28, 2013.
Exercise Prices | Options Outstanding |  | Options Exercisable
Number Outstanding |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$0.93-$7.35 | 235,358 |  |  | 1.41 |  | $ | 3.75 |  |  | 235,358 |  |  | $ | 3.75 |
$7.47-$10.46 | 265,654 |  |  | 3.01 |  | $ | 9.44 |  |  | 235,063 |  |  | $ | 9.35 |
$10.83-$13.08 | 233,446 |  |  | 3.52 |  | $ | 11.81 |  |  | 185,568 |  |  | $ | 11.88 |
$13.16-$14.88 | 192,792 |  |  | 5.33 |  | $ | 14.24 |  |  | 53,756 |  |  | $ | 14.32 |
$14.95-$15.85 | 289,732 |  |  | 5.93 |  | $ | 15.61 |  |  | 67,376 |  |  | $ | 15.64 |
$15.88-$16.59 | 148,238 |  |  | 3.09 |  | $ | 16.05 |  |  | 122,554 |  |  | $ | 16.03 |
$16.70-$16.70 | 285,419 |  |  | 4.03 |  | $ | 16.70 |  |  | 189,472 |  |  | $ | 16.70 |
$16.89-$19.03 | 245,900 |  |  | 5.34 |  | $ | 18.02 |  |  | 92,209 |  |  | $ | 18.19 |
$19.77-$19.77 | 3,000 |  |  | 4.52 |  | $ | 19.77 |  |  | 1,812 |  |  | $ | 19.77 |
$19.84-$19.84 | 9,500 |  |  | 4.14 |  | $ | 19.84 |  |  | 6,727 |  |  | $ | 19.84 |
$0.93-$19.84 | 1,909,039 |  |  | 4.02 |  | $ | 13.22 |  |  | 1,189,895 |  |  | $ | 11.84 |
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):
| Fiscal Year 2013 |  | Fiscal Year 2012 |  | Fiscal Year 2011
Cost of products | $ | 207 |  |  | $ | 164 |  |  | $ | 176 |
Cost of service | 278 |  |  | 230 |  |  | 218 |
Research and development | 1,478 |  |  | 1,220 |  |  | 984 |
Selling | 1,894 |  |  | 1,791 |  |  | 1,366 |
General and administrative | 2,919 |  |  | 2,485 |  |  | 1,729 |
Restructuring | 898 |  |  | — |  |  | — |
Total stock-based compensation expense related to employee stock options and employee stock purchases | $ | 7,674 |  |  | $ | 5,890 |  |  | $ | 4,473 |
Stock Options and Restricted Stock Units [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 including options and RSUs during fiscal year 2013, and shares available for grant at December 28, 2013, is as follows:
| Shares Available for Grant (Options and RSUs)
Shares available for grant at December 29, 2012 | 1,093,565 |
Increase in shares authorized | 2,600,000 |
Options - granted | (430,800 | )
Options - cancelled | 150,459 |
Options - expired plan shares | (53,607 | )
RSUs - granted | (664,902 | )
RSUs - canceled | 133,418 |
RSUs - shares issued to satisfy tax withholding obligations | 108,868 |
Shares available for grant at December 28, 2013 | 2,937,001 |
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock option plans activity | A summary of activity of stock options in 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 |  |  | — |
Exercised | (391,621 | ) |  | 8.71 |  |  | — |  |  | — |
Granted | 430,800 |  |  | 15.49 |  | — |  |  | — |
Cancelled | (150,459 | ) |  | 15.22 |  | — |  |  | — |
Outstanding at December 28, 2013 | 1,909,039 |  |  | $ | 13.22 |  |  | 4.02 |  |  | $ | 10,341 |
Exercisable at December 28, 2013 | 1,189,895 |  |  | $ | 11.84 |  |  | 3.25 |  |  | $ | 8,089 |
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 is as follows:
RSU | Number of RSU | Weighted Average Fair Value as of December 29, 2012
Outstanding RSU as of December 29, 2012 | 235,162 |  | $ | 16.32 |
Granted | 348,328 |  | 15.51 |
Released | (171,094 | ) | 16.69 |
Cancelled | (77,952 | ) | 18.29 |
Outstanding RSU as of December 28, 2013 | 334,444 |  | $ | 18.61 |

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