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3. Cash, Cash Equivalents, and Marketable Securities
 3 Months Ended
Mar. 31, 2023
Cash, Cash Equivalents, and Short-Term Investments [Abstract]  
Cash, Cash Equivalents, and Marketable Securities
3. Cash, Cash Equivalents, and Marketable Securities

Cash, cash equivalents, and marketable securities consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):
March 31,
2023		December 31,
2022
Cash and cash equivalents:
Cash$899,537 $1,476,945 
Money market funds7,097 4,324 
Total cash and cash equivalents906,634 1,481,269 
Marketable securities:
Foreign debt56,499 59,777 
U.S. debt56,731 56,463 
U.S. Treasury securities520,516 — 
Time deposits730,861 980,472 
Total marketable securities1,364,607 1,096,712 
Total cash, cash equivalents, and marketable securities$2,271,241 $2,577,981 

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 March 31, 2023 and December 31, 2022 to the total of such amounts as presented in the condensed consolidated statements of cash flows (in thousands):
Balance Sheet Line ItemMarch 31,
2023		December 31,
2022
Cash and cash equivalentsCash and cash equivalents$906,634 $1,481,269 
Restricted cash – current
Other current assets12,256 3,175 
Restricted cash – noncurrent
Other assets1,349 2,734 
Restricted cash equivalents - noncurrentOther assets2,579 6,284 
Total cash, cash equivalents, restricted cash, and restricted cash equivalents$922,818 $1,493,462 

See Note 9. “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 March 31, 2023 and December 31, 2022 (in thousands):
 As of March 31, 2023
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Allowance for Credit LossesFair
Value
Foreign debt$56,952 $— $430 $23 $56,499 
U.S. debt58,376 — 1,623 22 56,731 
U.S. Treasury securities520,705 — 189 — 520,516 
Time deposits731,114 — — 253 730,861 
Total$1,367,147 $— $2,242 $298 $1,364,607 
 As of December 31, 2022
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Allowance for Credit LossesFair
Value
Foreign debt$59,940 $— $140 $23 $59,777 
U.S. debt58,308 — 1,823 22 56,463 
Time deposits980,810 — — 338 980,472 
Total$1,099,058 $— $1,963 $383 $1,096,712 

The following table presents the change in the allowance for credit losses related to our available-for-sale marketable securities for the three months ended March 31, 2023 and 2022 (in thousands):
Three Months Ended
March 31,
20232022
Allowance for credit losses, beginning of period$383 $97 
Provision for credit losses, net253 49 
Sales and maturities of marketable securities(338)(86)
Allowance for credit losses, end of period$298 $60 

The contractual maturities of our marketable securities as of March 31, 2023 were as follows (in thousands):
Fair
Value
One year or less$1,259,325 
One year to two years69,886 
Two years to three years31,399 
Three years to four years— 
Four years to five years— 
More than five years3,997 
Total$1,364,607