Marketable Debt Securities

Investments in marketable debt securities were comprised of the following (in thousands):



	April 4, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. Treasury securities	$	32,506	$	25	$	—		$	32,531
Corporate bonds	32,791		19		(9		)	32,801
U.S. Agency bonds	22,528		27		—			22,555
Commercial paper	14,987		—		—			14,987
Municipal bonds	13,035		3		(3		)	13,035
	$	115,847	$	74	$	(12	)	$	115,909



	January 3, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. Treasury securities	$	32,507	$	12	$	(23	)	$	32,496
Corporate bonds	35,409		2		(36		)	35,375
U.S. Agency bonds	22,545		4		(10		)	22,539
Commercial paper	12,487		—		(1		)	12,486
Municipal bonds	11,157		2		(5		)	11,154
	$	114,105	$	20	$	(75	)	$	114,050

Maturities of marketable debt securities were as follows (in thousands):



	April 4, 2015				January 3, 2015
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Marketable debt securities – current (due in less than one year)	$	75,019	$	75,035	$	69,607	$	69,609
Marketable debt securities – non-current (due in one to two years)	40,828		40,874		44,498		44,441
	$	115,847	$	115,909	$	114,105	$	114,050

During the three months ended April 4, 2015 and March 29, 2014, $16.2 million and $10.0 million, respectively, of marketable debt securities matured and were redeemed at face value.

Other Investments

We have a minority equity investment in one of our strategic product-development partners. The carrying value of this investment at April 4, 2015 and January 3, 2015 using the cost method is $6.0 million and is included in other assets on our condensed consolidated balance sheets.