Investments (Tables)

3 Months Ended

Mar. 30, 2019

Amortized Cost and Fair Value of Available-for-Sale Investments

The amortized cost and fair values of available-for-sale investments are as follows at March 30, 2019 and December 29, 2018 (in thousands):

			Gross		Gross
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
March 30, 2019
Money market investments	$	12,719	$	—	$	—	$	12,719
Asset-backed securities		518		—		2		516
Corporate bonds and direct obligations of government agencies		100,994		428		343		101,079
Total	$	114,231	$	428	$	345	$	114,314
December 29, 2018
Money market investments	$	11,714	$	—	$	—	$	11,714
Asset-backed securities		624		—		4		620
Corporate bonds and direct obligations of government agencies		101,021		33		1,213		99,841
Total	$	113,359	$	33	$	1,217	$	112,175

Schedule of Unrealized Loss on Available-for-Sale Investments

For those available-for-sale investments with unrealized losses at March 30, 2019 and December 29, 2018, the following table summarizes the duration of the unrealized loss (in thousands):

	Less than 12 months				12 months or longer				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
March 30, 2019
Asset-backed securities	$	—	$	—	$	516	$	2	$	516	$	2
Corporate bonds and direct obligations of government agencies		13,900		31		48,181		312		62,081		343
Total	$	13,900	$	31	$	48,697	$	314	$	62,597	$	345
December 29, 2018
Asset-backed securities	$	—	$	—	$	620	$	4	$	620	$	4
Corporate bonds and direct obligations of government agencies		45,960		354		42,803		859		88,763		1,213
Total	$	45,960	$	354	$	43,423	$	863	$	89,383	$	1,217