Cash and Investments

12 Months Ended

Dec. 30, 2022

Investments, Debt and Equity Securities [Abstract]

Cash, Cash Equivalents and Restricted Cash Equivalents

A reconciliation of cash, cash equivalents, and restricted cash equivalents reported in the accompanying Consolidated Balance Sheets to the amount reported within the accompanying Consolidated Statements of Cash Flows was as follows (in thousands):


	December 31,
	2022		2021
Cash and cash equivalents	$	501,195	$	647,169

Restricted cash equivalents included in other long-term assets	1,482		16,722
Cash, cash equivalents and restricted cash equivalents as reported within the accompanying Consolidated Statements of Cash Flows	$	502,677	$	663,891

Restricted cash equivalents are used to collateralize letters of credit agreements and are invested in short-term certificates of deposit with original maturity of 90 days or less as of December 31, 2022 and money market fund securities as of December 31, 2021. The restricted cash equivalents are classified as other long-term assets. The standby letter of credit entered into in January 2021, as a guarantee of our obligation to fund our portion of the tenant improvements related to our Alameda build-to-suit lease was extinguished and the related collateral was returned in the third quarter of 2022, following the substantial completion of the building and the commencement of the lease.

Cash, Cash Equivalents, Restricted Cash Equivalents and Investments

Cash, cash equivalents, restricted cash equivalents and investments consisted of the following (in thousands):


	December 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Debt securities available-for-sale:
Commercial paper	$	722,018	$	—	$	—	$	722,018
Corporate bonds	810,439		541		(13,132)		797,848
U.S. Treasury and government-sponsored enterprises	338,218		48		(5,679)		332,587
Municipal bonds	16,385		—		(223)		16,162
Total debt securities available-for-sale	1,887,060		589		(19,034)		1,868,615
Cash	41		—		—		41
Money market funds	94,344		—		—		94,344
Certificates of deposit	103,681		—		—		103,681
Total cash, cash equivalents, restricted cash equivalents and investments	$	2,085,126	$	589	$	(19,034)	$	2,066,681


	December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Debt securities available-for-sale:
Commercial paper	$	945,801	$	42	$	(2)	$	945,841
Corporate bonds	541,774		876		(1,672)		540,978
U.S. Treasury and government-sponsored enterprises	33,965		1		(21)		33,945
Municipal bonds	12,924		15		(35)		12,904
Total debt securities available-for-sale	1,534,464		934		(1,730)		1,533,668
Cash	135,653		—		—		135,653
Money market funds	66,531		—		—		66,531
Certificates of deposit	119,056		—		—		119,056
Total cash, cash equivalents, restricted cash equivalents and investments	$	1,855,704	$	934	$	(1,730)	$	1,854,908

Interest receivable was $7.3 million and $2.9 million as of December 31, 2022 and 2021, respectively, and is included in prepaid and other current assets in the accompanying Consolidated Balance Sheets.

Realized gains and losses on the sales of investments were insignificant during the years ended December 31, 2022, 2021 and 2020.

We manage credit risk associated with our investment portfolio through our investment policy, which limits purchases to high-quality issuers and limits the amount of our portfolio that can be invested in a single issuer. The fair value and gross unrealized losses on debt securities available-for-sale in an unrealized loss position were as follows (in thousands):


	December 31, 2022
	Fair Value		Gross Unrealized Losses
Corporate bonds	$	706,711	$	(13,132)
U.S. Treasury and government-sponsored enterprises	308,307		(5,679)

Municipal bonds	15,792		(223)
Total	$	1,030,810	$	(19,034)


	December 31, 2021

	Fair Value		Gross Unrealized Losses
Corporate bonds	$	385,053	$	(1,672)
Commercial paper	43,290		(2)
U.S. Treasury and government-sponsored enterprises	18,962		(21)
Municipal bonds	7,475		(35)
Total	$	454,780	$	(1,730)

There were 285 and 133 debt securities available-for-sale in an unrealized loss position as of December 31, 2022 and 2021, respectively. All securities presented above have been in an unrealized loss position for less than twelve months except for 76 corporate bond securities, 4 municipal bond securities and 1 U.S. Treasury and government-sponsored enterprises security with an aggregate fair value of $237.6 million and an aggregate $6.1 million unrealized losses as of December 31, 2022. During the years ended December 31, 2022 and 2021, we did not record an allowance for credit losses or other impairment charges on our investment securities. Based upon our quarterly impairment review, we determined that the unrealized losses were not attributed to credit risk, but were primarily associated with changes in interest rates and market liquidity. Based on the scheduled maturities of our investments, we determined that it was more likely than not that we will hold these investments for a period of time sufficient for a recovery of our cost basis.

The fair value of debt securities available-for-sale by contractual maturity was as follows (in thousands):


	December 31,
	2022		2021
Maturing in one year or less	$	1,114,884	$	1,168,256
Maturing after one year through five years	753,731		365,412
Total debt securities available-for-sale	$	1,868,615	$	1,533,668