Investments (Tables)

6 Months Ended

Jun. 29, 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 June 29, 2019 and December 29, 2018 (in thousands):    

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
June 29, 2019
Money market investments	$	17,207	$	—	$	—	$	17,207
Asset-backed securities		112		—		—		112
Corporate bonds and direct obligations of government agencies		96,282		1,155		49		97,388
U.S. Treasury obligations		1,104		9		—		1,113
Total	$	114,705	$	1,164	$	49	$	115,820
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 June 29, 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
June 29, 2019
Corporate bonds and direct obligations of government agencies	$	288	$	1	$	17,420	$	48	$	17,708	$	49
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