2. Cash, Cash Equivalents, and Marketable Securities (Notes)

6 Months Ended

Jun. 30, 2024

Cash, Cash Equivalents, and Short-Term Investments [Abstract]

Cash, Cash Equivalents, and Marketable Securities

2. Cash, Cash Equivalents, and Marketable Securities

Cash, cash equivalents, and marketable securities consisted of the following at June 30, 2024 and December 31, 2023 (in thousands):

	June 30, 2024		December 31, 2023
Cash and cash equivalents:
Cash	$	943,765	$	841,310
Money market funds	759,148		1,105,684
Total cash and cash equivalents	1,702,913		1,946,994
Marketable securities:
Foreign debt	—		34,895
U.S. debt	8,517		44,089
Time deposits	28,913		76,511
Total marketable securities	37,430		155,495
Total cash, cash equivalents, and marketable securities	$	1,740,343	$	2,102,489

The following table provides a reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents reported within our condensed consolidated balance sheets as of June 30, 2024 and December 31, 2023 to the total of such amounts as presented in the condensed consolidated statements of cash flows (in thousands):

	Balance Sheet Line Item	June 30, 2024		December 31, 2023
Cash and cash equivalents	Cash and cash equivalents	$	1,702,913	$	1,946,994
Restricted cash – current	Other current assets	8,262		8,262
Restricted cash – noncurrent	Other assets	3,601		3,621
Restricted cash equivalents – noncurrent	Other assets	1,801		6,192
Total cash, cash equivalents, restricted cash, and restricted cash equivalents		$	1,716,577	$	1,965,069

During the three months ended June 30, 2024, we sold marketable securities for proceeds of $67.5 million and realized a gain of less than $0.1 million on such sales. During the three months ended June 30, 2023, we sold marketable securities for proceeds of $34.9 million and realized a loss of less than $0.1 million on such sales. See Note 8. “Fair Value Measurements” to our condensed consolidated financial statements for information about the fair value of our marketable securities.

The following tables summarize the unrealized gains and losses related to our available-for-sale marketable securities, by major security type, as of June 30, 2024 and December 31, 2023 (in thousands):

	As of June 30, 2024
	Amortized Cost		Unrealized Gains		Unrealized Losses		Allowance for Credit Losses		Fair Value
U.S. debt	$	10,000	$	—	$	1,483	$	—	$	8,517
Time deposits	28,916		—		—		3		28,913
Total	$	38,916	$	—	$	1,483	$	3	$	37,430

	As of December 31, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses		Allowance for Credit Losses		Fair Value
Foreign debt	$	35,000	$	—	$	91	$	14	$	34,895
U.S. debt	45,625		88		1,614		10		44,089
Time deposits	76,533		—		—		22		76,511
Total	$	157,158	$	88	$	1,705	$	46	$	155,495

The contractual maturities of our marketable securities as of June 30, 2024 were as follows (in thousands):

	Fair Value
Within one year	$	28,913
After one year through five years	4,615
After five years through ten years	3,902
Total	$	37,430