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Cash and Investments (Tables)
 3 Months Ended
Mar. 28, 2015
Investments, Debt and Equity Securities [Abstract]  
Cash, cash equivalents and available-for-sale investments
The following tables present cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):

 
March 28, 2015
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Market Value
Cash
$
27,026

 
—

 
$
—

 
$
27,026

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
909

 
—

 
—

 
909

Marketable securities:
 
 
 
 
 
 
 
Commercial paper
1,398

 
—

 
—

 
1,398

U.S. Treasury securities
2,499

 
—

 
—

 
2,499

U.S. Government agency securities
21,553

 
6

 
(5
)
 
21,554

Municipal securities
3,020

 
1

 
(2
)
 
3,019

Corporate debt securities
20,647

 
4

 
(7
)
 
20,644

Total cash, cash equivalents, and marketable securities
$
77,052

 
$
11

 
$
(14
)
 
$
77,049

 
 
 
 
 
 
 
 
 
December 27, 2014
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Market Value
Cash
$
34,066

 
$
—

 
$
—

 
$
34,066

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
610

 
—

 
—

 
610

Marketable securities:
 
 
 
 
 
 
 
Commercial paper
805

 
—

 
—

 
805

U.S. Treasury Securities
2,498

 
—

 
(1
)
 
2,497

U.S. Government agency securities
20,556

 
1

 
(19
)
 
20,538

Municipal securities
3,755

 
1

 
(7
)
 
3,749

Corporate debt securities
21,722

 
1

 
(26
)
 
21,697

Total cash, cash equivalents, and marketable securities
$
84,012

 
$
3

 
$
(53
)
 
$
83,962