Investments (Tables)

12 Months Ended

Dec. 31, 2022

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 31, 2022 and December 25, 2021 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 31, 2022
Money market investments	$	21,910	$	—	$	—	$	21,910
Asset-backed securities		18,905		—		2,889		16,016
Corporate bonds and direct obligations of government agencies		126,134		1		7,775		118,360
U.S. Treasury obligations		2,344		—		100		2,244
Total	$	169,293	$	1	$	10,764	$	158,530
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

Schedule of Unrealized Loss on Available-for-Sale Investments

For those available-for-sale investments with unrealized losses at December 31, 2022 and December 25, 2021, 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 31, 2022
Asset-backed securities	$	—	$	—	$	16,016	$	2,889	$	16,016	$	2,889
Corporate bonds and direct obligations of government agencies		54,031		1,516		62,390		6,259		116,421		7,775
U.S. Treasury obligations		2,244		100		—		—		2,244		100
Total	$	56,275	$	1,616	$	78,406	$	9,148	$	134,681	$	10,764
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