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Cash and Investments (Tables)
 12 Months Ended
Dec. 27, 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 the following dates (in thousands):

 
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

 
 
 
 
 
 
 
 
 
December 28, 2013
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Market Value
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