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Cash and Investments (Tables)
 9 Months Ended
Sep. 28, 2013
Investments, Debt and Equity Securities [Abstract]  
Cash, Cash Equivalents and Available-for-sale Investments
The following table presents cash, cash equivalents, and available-for-sale investments as of September 28, 2013, and December 29, 2012 (in thousands):
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Market Value
September 28, 2013
 
 
 
 
 
 
 
Cash
$
43,085

 
$
—

 
$
—

 
$
43,085

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
748

 
—

 
—

 
748

Marketable securities:
 
 
 
 
 
 
 
Commercial paper
950

 
—

 
—

 
950

U.S. Treasury securities
5,048

 
—

 
—

 
5,048

U.S. Government agency securities
15,685

 
8

 
(4
)
 
15,689

Municipal securities
8,546

 
11

 
—

 
8,557

Corporate debt securities
18,803

 
16

 
(6
)
 
18,813

Total cash, cash equivalents, and short-term investments
$
92,865

 
$
35

 
$
(10
)
 
$
92,890

 
 
 
 
 
 
 
 
December 29, 2012
 
 
 
 
 
 
 
Cash
$
60,206

 
$
—

 
$
—

 
$
60,206

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
109

 
—

 
—

 
109

Commercial paper
2,600

 
—

 
—

 
2,600

Short-term investments:
 
 
 
 
 
 
 
Commercial paper
3,199

 
—

 
—

 
3,199

U.S. Treasury Securities
4,996

 
1

 
—

 
4,997

U.S. Government agency securities
15,567

 
6

 
(2
)
 
15,571

Municipal securities
5,396

 
1

 
(1
)
 
5,396

Corporate debt securities
17,837

 
2

 
(9
)
 
17,830

Total cash, cash equivalents, and short-term investments
$
109,910

 
$
10

 
$
(12
)
 
$
109,908