Investments (Tables)

12 Months Ended

Dec. 28, 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 December 28, 2019 and December 29, 2018 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 28, 2019
Money market investments	$	15,691	$	—	$	—	$	15,691
Asset-backed securities		572		—		1		571
Corporate bonds and direct obligations of government agencies		97,583		1,465		44		99,004
U.S. Treasury obligations		2,335		12		5		2,342
Total	$	116,181	$	1,477	$	50	$	117,608
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 December 28, 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
December 28, 2019
Asset-backed securities	$	571	$	1	$	—	$	—	$	571	$	1
Corporate bonds and direct obligations of government agencies		8,728		41		4,260		3		12,988		44
U.S. Treasury obligations		1,226		5		—		—		1,226		5
Total	$	10,525	$	47	$	4,260	$	3	$	14,785	$	50
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