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Stock-Based Compensation (Tables)
 12 Months Ended
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