Investments (Tables)

12 Months Ended

Dec. 25, 2021

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 25, 2021 and December 26, 2020 (in thousands):    

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 25, 2021
Money market investments	$	8,750	$	—	$	—	$	8,750
Asset-backed securities		22,441		—		346		22,095
Corporate bonds and direct obligations of government agencies		137,916		1,406		966		138,356
U.S. Treasury obligations		2,342		50		—		2,392
Total	$	171,449	$	1,456	$	1,312	$	171,593
December 26, 2020
Money market investments	$	17,867	$	—	$	—	$	17,867
Asset-backed securities		567		—		26		541
Corporate bonds and direct obligations of government agencies		98,241		3,551		72		101,720
U.S. Treasury obligations		2,338		125		—		2,463
Total	$	119,013	$	3,676	$	98	$	122,591

Schedule of Unrealized Loss on Available-for-Sale Investments

For those available-for-sale investments with unrealized losses at December 25, 2021 and December 26, 2020, 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 25, 2021
Asset-backed securities	$	22,095	$	346	$	—	$	—	$	22,095	$	346
Corporate bonds and direct obligations of government agencies		72,526		966		—		—		72,526		966
Total	$	94,621	$	1,312	$	—	$	—	$	94,621	$	1,312
December 26, 2020
Asset-backed securities	$	541	$	26	$	—	$	—	$	541	$	26
Corporate bonds and direct obligations of government agencies		2,681		72		—		—		2,681		72
Total	$	3,222	$	98	$	—	$	—	$	3,222	$	98