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Cash and Investments (Tables)
 9 Months Ended
Sep. 26, 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):

 
September 26, 2015
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Market Value
Cash
$
34,485

 
$
—

 
$
—

 
$
34,485

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
642

 
—

 
—

 
642

Commercial paper
6,434

 
—

 
—

 
6,434

Marketable securities:
 
 
 
 
 
 
 
Commercial paper
1,498

 
—

 
—

 
1,498

U.S. Government agency securities
21,668

 
17

 
(1
)
 
21,684

Municipal securities
3,714

 
5

 
(1
)
 
3,718

Corporate debt securities
16,168

 
3

 
(6
)
 
16,165

Total cash, cash equivalents, and marketable securities
$
84,609

 
$
25

 
$
(8
)
 
$
84,626

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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