Short-Term Investments (Tables)

9 Months Ended

Sep. 26, 2014

Cash and Cash Equivalents [Abstract]

Summary of Short-Term Investments

The following table summarizes the Company’s short-term investments (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
As of September 26, 2014
State, municipal and local government agencies bonds	$	25,719	$	26	$	(31	)	$	25,714
Corporate bonds	26,150		5		(17		)	26,138
Commercial paper	3,299		—		—			3,299
U.S. federal government bonds	—		—		—			—
Total short-term investments	$	55,168	$	31	$	(48	)	$	55,151
As of December 31, 2013
State, municipal and local government agencies bonds	$	40,426	$	38	$	(15	)	$	40,449
Corporate bonds	33,483		20		(7		)	33,496
Commercial paper	2,299		—		—			2,299
U.S. federal government bonds	4,004		4		—			4,008
Total short-term investments	$	80,212	$	62	$	(22	)	$	80,252

Maturities of Short-Term Investments

The following table summarizes the maturities of the Company’s short-term investments (in thousands):

	September 26, 2014		December 31, 2013
Less than one year	$	44,452	$	55,278
Due in 1 - 2 years	10,699		24,974
Total short-term investments	$	55,151	$	80,252