Cash, Cash Equivalents, Restricted Cash and Marketable Securities

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Cash, Cash Equivalents, Restricted Cash and Marketable Securities

Cash and Cash Equivalents, Restricted Cash and Marketable Securities

The following table provides a reconciliation of cash and cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows (in thousands):


	December 31,
	2023		2022		2021
Cash and cash equivalents	$	150,279	$	202,004	$	436,189
Restricted cash (1)		277		207		219
Total cash and cash equivalents, and restricted cash shown in the consolidated statements of cash flows	$	150,556	$	202,211	$	436,408

(1) Restricted cash is included in "Other assets" in the Consolidated Balance Sheets.

Restricted cash balances relate to certificates of deposit issued as collateral to certain letters of credit issued as security to our lease arrangements (See Note 8).

Cash and cash equivalents, and marketable securities consist of the following (in thousands):


	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
December 31, 2023
Cash and cash equivalents:
Cash	$	11,190	$	-	$	-		$	11,190
Money market funds		131,635		-		-			131,635
Corporate debt securities		7,453		1		-			7,454
Total cash and cash equivalents		150,278		1		-			150,279
Marketable securities available-for-sale:
U.S. treasuries		74,109		172		(44	)		74,237
U.S. government agency securities		216,265		692		(269	)		216,688
Corporate debt securities		300,803		315		(20	)		301,098
Total marketable securities available-for-sale		591,177		1,179		(333	)		592,023
Total cash and cash equivalents, and marketable securities	$	741,455	$	1,180	$	(333	)	$	742,302
December 31, 2022
Cash and cash equivalents:
Cash	$	29,586	$	-	$	-		$	29,586
Money market funds		172,418		-		-			172,418
Total cash and cash equivalents		202,004		-		-			202,004
Marketable securities available-for-sale:
U.S. treasuries		42,502		-		(194	)		42,308
U.S. government agency securities		88,429		-		(397	)		88,032
Corporate debt securities		292,865		12		(826	)		292,051
Total marketable securities available-for-sale		423,796		12		(1,417	)		422,391
Total cash and cash equivalents, and marketable securities	$	625,800	$	12	$	(1,417	)	$	624,395

The maturities of our marketable securities available-for-sale are as follows (in thousands):


.	December 31, 2023
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	440,131	$	440,104
Mature after one year through two years		151,046		151,919
	$	591,177	$	592,023

We have classified our entire investment portfolio as available-for-sale and available for use in current operations and accordingly have classified all investments as short-term. Available-for-sale securities are carried at fair value based on inputs that are observable, either directly or indirectly, such as quoted market prices for similar securities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the securities. Unrealized losses are included in accumulated other comprehensive loss in stockholders’ equity. Commencing with our adoption of ASC 326 on January 1, 2023, we determine whether a decline in the fair value of our AFS debt securities below their amortized cost basis (i.e., an impairment) is due to credit-related factors or noncredit-related factors. Any impairment that is not credit related is recognized in other comprehensive income (loss), net of applicable taxes. Credit-related impairments (if any) are recognized as an allowance on the balance sheet with a corresponding adjustment to earnings. Both the allowance and the adjustment to net income can be reversed if conditions change.

There were no realized gains or losses from the sale of marketable securities for the years ended December 31, 2023 and 2022. We do not intend to sell, and are not required to sell, the investments that are in an unrealized loss position before recovery of their amortized cost basis. For the year ended December 31, 2023, we did not record an allowance for credit losses, as management believes any such losses would be immaterial based on the investment-grade credit rating for each of the investments as of December 31, 2023. As such, there have been no declines in fair value that have been identified as a credit-related impairment.