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Cash and Investments (Notes)
 9 Months Ended
Sep. 28, 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 September 28, 2013, and December 29, 2012 (in thousands):
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Market Value
September 28, 2013
 
 
 
 
 
 
 
Cash
$
43,085

 
$
—

 
$
—

 
$
43,085

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
748

 
—

 
—

 
748

Marketable securities:
 
 
 
 
 
 
 
Commercial paper
950

 
—

 
—

 
950

U.S. Treasury securities
5,048

 
—

 
—

 
5,048

U.S. Government agency securities
15,685

 
8

 
(4
)
 
15,689

Municipal securities
8,546

 
11

 
—

 
8,557

Corporate debt securities
18,803

 
16

 
(6
)
 
18,813

Total cash, cash equivalents, and short-term investments
$
92,865

 
$
35

 
$
(10
)
 
$
92,890

 
 
 
 
 
 
 
 
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 September 28, 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 nine month periods ended September 28, 2013, and September 29, 2012, were insignificant and no marketable securities had other than temporary impairment. All marketable securities as of September 28, 2013, and December 29, 2012, had maturity dates of less than two years and none were invested in foreign entities.