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Cash and Investments
 9 Months Ended
Sep. 27, 2014
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 the following dates (in thousands):
 
September 27, 2014
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Market Value
Cash
$
34,426

 
—

 
$
—

 
$
34,426

Cash equivalents:
 
 
 
 
 
 
 
Money market funds
549

 
—

 
—

 
549

Commercial paper
650

 
—

 
—

 
650

Marketable securities:
 
 
 
 
 
 
 
Commercial paper
700

 
—

 
—

 
700

U.S. Treasury securities
2,497

 
1

 
—

 
2,498

U.S. Government agency securities
18,685

 
6

 
(4
)
 
18,687

Municipal securities
5,014

 
3

 
(2
)
 
5,015

Corporate debt securities
21,850

 
9

 
(11
)
 
21,848

Total cash, cash equivalents, and marketable securities
$
84,371

 
$
19

 
$
(17
)
 
$
84,373

 
 
 
 
 
 
 
 
 
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

 
 
 
 
 
 
 
 


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 27, 2014 and December 28, 2013, 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 months ended September 27, 2014 and September 28, 2013, were insignificant and no marketable securities had other than temporary impairment. All marketable securities as of September 27, 2014 and December 28, 2013, had maturity dates of less than two years and were not invested in foreign entities.