Cash and Investments (Tables)

9 Months Ended

Sep. 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):

	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