Cash and Investments (Tables)

6 Months Ended

Jun. 28, 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):

	June 28, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	37,584	—		$	—		$	37,584
Cash equivalents:
Money market funds	403		—		—			403
Marketable securities:
Commercial paper	999		—		—			999
U.S. Treasury securities	5,008		1		—			5,009
U.S. Government agency securities	13,412		6		(2		)	13,416
Municipal securities	8,228		5		(1		)	8,232
Corporate debt securities	21,710		14		(6		)	21,718
Total cash, cash equivalents, and marketable securities	$	87,344	$	26	$	(9	)	$	87,361
	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