Cash and Investments (Tables)

9 Months Ended

Sep. 24, 2016

Investments Debt And Equity Securities [Abstract]

Cash, Cash Equivalents and Available-for-Sale Investments

The following tables present cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):

	September 24, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	32,337	$	—	$	—			32,337
Cash equivalents:
Money market funds		840		—		—			840
Commercial paper and corporate debt securities		4,245		—		(1	)		4,244
Marketable securities:
U.S. Treasury securities		6,935		9		—			6,944
U.S. Government agency securities		14,301		11		—			14,312
Certificate of deposits		15,997		11		—			16,008
Commercial paper		23,845		3		—			23,848
Municipal securities		765		—		—			765
Corporate debt securities		11,762		—		(1	)		11,761
Asset-backed securities		7,470		—		(2	)		7,468
Total cash, cash equivalents, and marketable securities	$	118,497	$	34	$	(4	)	$	118,527
	December 26, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	32,996	$	—	$	—		$	32,996
Cash equivalents:
Money market funds		590		—		—			590
Commercial paper and corporate debt securities		4,568		—		—			4,568
Marketable securities:
U.S. Treasury securities		4,411		—		(10	)		4,401
U.S. Government agency securities		20,193		1		(29	)		20,165
Commercial paper		1,884		—		—			1,884
Municipal securities		3,747		1		(3	)		3,745
Corporate debt securities		14,759		—		(23	)		14,736
Total cash, cash equivalents, and marketable securities	$	83,148	$	2	$	(65	)	$	83,085