Cash and Investments (Tables)

6 Months Ended

Jun. 25, 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):

	June 25, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	45,651	$	—	$	—			45,651
Cash equivalents:
Money market funds		14,381		—		—			14,381
Commercial paper and corporate debt securities		—		—		—			—
Marketable securities:
Commercial paper		—		—		—			—
U.S. Treasury securities		—		—		—			—
U.S. Government agency securities		23,913		25		(1	)		23,937
Municipal securities		2,425		1		—			2,426
Corporate debt securities		9,587		4		(2	)		9,589
Total cash, cash equivalents, and marketable securities	$	95,957	$	30	$	(3	)	$	95,984
	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:
Commercial paper		1,884		—		—			1,884
U.S. Treasury securities		4,411		—		(10	)		4,401
U.S. Government agency securities		20,193		1		(29	)		20,165
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