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Cash and Investments (Notes)
 6 Months Ended
Jun. 29, 2013
Investments, Debt and Equity Securities [Abstract]  
Cash and Investments
Cash and Investments
The following table presents cash, cash equivalents, and available-for-sale investments as of June 29, 2013, and December 29, 2012 (in thousands):
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Market Value
June 29, 2013
 
 
 
 
 
 
 
Cash
$
36,615

 
$
—

 
$
—

 
$
36,615

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
486

 
—

 
—

 
486

Commercial paper
—

 
—

 
—

 
—

Municipal securities
2,000

 
1

 
—

 
2,001

Marketable securities:
 
 
 
 
 
 
 
Commercial paper
1,000

 
—

 
—

 
1,000

U.S. Treasury securities
4,999

 
1

 
—

 
5,000

U.S. Government agency securities
15,103

 
2

 
(5
)
 
15,100

Municipal securities
9,984

 
7

 
(1
)
 
9,990

Corporate debt securities
16,085

 
2

 
(15
)
 
16,072

Total cash, cash equivalents, and short-term investments
$
86,272

 
$
13

 
$
(21
)
 
$
86,264

 
 
 
 
 
 
 
 
December 29, 2012
 
 
 
 
 
 
 
Cash
$
60,206

 
$
—

 
$
—

 
$
60,206

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
109

 
—

 
—

 
109

Commercial paper
2,600

 
—

 
—

 
2,600

Short-term investments:
 
 
 
 
 
 
 
Commercial paper
3,199

 
—

 
—

 
3,199

U.S. Treasury Securities
4,996

 
1

 
—

 
4,997

U.S. Government agency securities
15,567

 
6

 
(2
)
 
15,571

Municipal securities
5,396

 
1

 
(1
)
 
5,396

Corporate debt securities
17,837

 
2

 
(9
)
 
17,830

Total cash, cash equivalents, and short-term investments
$
109,910

 
$
10

 
$
(12
)
 
$
109,908



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 June 29, 2013, and December 29, 2012, 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 and six month periods ended June 29, 2013, and June 30, 2012, were insignificant and no marketable securities had other than temporary impairment. All marketable securities as of June 29, 2013, and December 29, 2012, had maturity dates of less than two years and none were invested in foreign entities.