Cash and Investments (Tables)

12 Months Ended

Dec. 26, 2015

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):

	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
	December 27, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	34,066	$	—	$	—		$	34,066
Cash equivalents:
Money market funds		610		—		—			610
Marketable securities:
Commercial paper and corporate debt securities		805		—		—			805
U.S. Treasury securities		2,498		—		(1	)		2,497
U.S. Government agency securities		20,556		1		(19	)		20,538
Municipal securities		3,755		1		(7	)		3,749
Corporate debt securities		21,722		1		(26	)		21,697
Total cash, cash equivalents, and marketable securities	$	84,012	$	3	$	(53	)	$	83,962