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Cash and Investments
 3 Months Ended
Mar. 28, 2015
Investments, Debt and Equity Securities [Abstract]  
Cash and Investments
Cash and 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

 
 
 
 
 
 
 
 


Available-for-sale marketable securities, readily convertible to cash, with maturity dates of 90 days or less are classified as cash equivalents, while those with maturity dates greater than 90 days are classified as marketable securities within short-term assets. All marketable securities as of March 28, 2015 and December 27, 2014, were available-for-sale and reported at fair value based on the estimated or quoted market prices as of the balance sheet date. Unrealized gains or losses, net of tax effect, are recorded in accumulated other comprehensive income (loss) within stockholders’ equity. Both the gross unrealized gains and gross unrealized losses for the three months ended March 28, 2015 and March 29, 2014 were insignificant and no marketable securities had other than temporary impairment. All marketable securities as of March 28, 2015 and December 27, 2014, had maturity dates of less than two years and were not invested in foreign entities.