Financial Instruments Measured at Fair Value (Tables)

9 Months Ended

Sep. 27, 2014

Fair Value Disclosures [Abstract]

Short-Term Investments by Security Type

Investments that we have classified as short-term, by security type, are as follows (in thousands):

	September 27, 2014
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	155	$	—	$	—	$	155
Bank certificates of deposit		1,000		—		—		1,000
	$	1,155	$	—	$	—	$	1,155
	December 28, 2013
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
Municipal securities	$	1,200	$	—	$	—	$	1,200

Effective Maturities of Short-Term Investments

Effective maturities of short-term investments are as follows (in thousands):

	September 27, 2014				December 28, 2013
	Amortized		Estimated		Amortized		Estimated
	Cost		Fair Value		Cost		Fair Value
Due in one year or less	$	1,155	$	1,155	$	1,200	$	1,200

Assets Measured at Fair Value on Recurring Basis

The following table summarizes, by major security type, our assets that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):

	Fair value measurements at September 27, 2014 using:
							Total estimated
	Level 1		Level 2		Level 3		fair value
Cash	$	56,156	$	—	$	—	$	56,156
Municipal securities		—		155		—		155
Money market funds		—		4,422		—		4,422
Bank certificates of deposit		—		1,000		—		1,000
	$	56,156	$	5,577	$	—	$	61,733

	Fair value measurements at December 28, 2013 using:
							Total estimated
	Level 1		Level 2		Level 3		fair value
Cash	$	44,165	$	—	$	—	$	44,165
Municipal securities		—		1,200		—		1,200
Money market funds		—		7,503		—		7,503
	$	44,165	$	8,703	$	—	$	52,868