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Cash and Investments (Tables)
 3 Months Ended
Mar. 29, 2014
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 March 29, 2014 and December 28, 2013 (in thousands):

 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Market Value
March 29, 2014
 
 
 
 
 
 
 
Cash
$
38,247

 
—

 
$
—

 
$
38,247

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
586

 
—

 
—

 
586

Marketable securities:
 
 
 
 
 
 
 
Commercial paper and corporate debt securities
800

 
—

 
—

 
800

U.S. Treasury securities
5,022

 
1

 
—

 
5,023

U.S. Government agency securities
11,768

 
6

 
(2
)
 
11,772

Municipal securities
10,367

 
7

 
(1
)
 
10,373

Corporate debt securities
21,238

 
5

 
(7
)
 
21,236

Total cash, cash equivalents, and marketable securities
$
88,028

 
$
19

 
$
(10
)
 
$
88,037

 
 
 
 
 
 
 
 
December 28, 2013
 
 
 
 
 
 
 
Cash
$
43,139

 
$
—

 
$
—

 
$
43,139

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
876

 
—

 
—

 
876

Commercial paper
750

 
—

 
—

 
750

Marketable securities:
 
 
 
 
 
 
 
U.S. Treasury Securities
5,036

 
—

 
—

 
5,036

U.S. Government agency securities
11,980

 
4

 
(4
)
 
11,980

Municipal securities
9,756

 
11

 
(4
)
 
9,763

Corporate debt securities
21,316

 
7

 
(5
)
 
21,318

Total cash, cash equivalents, and marketable securities
$
92,853

 
$
22

 
$
(13
)
 
$
92,862