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Cash, Cash Equivalents and Restricted Cash
9 Months Ended
Sep. 30, 2021
Short-Term Investments And Fair Value Measurement [Abstract]  
Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents and Restricted Cash
The following tables summarize the Company's cash, cash equivalents, and restricted cash as of September 30, 2021 and December 31, 2020:

 As of September 30, 2021
 Cash and cash equivalentsOther Current AssetsNon-current AssetsTotal
 (in thousands)
Cash$4,837,580 $1,980 $24,161 $4,863,721 
Level 1 securities:
Money market funds2,388,562 — 146 2,388,708 
Level 2 securities:
Foreign Time Deposits300,539 — — 300,539 
$7,526,681 $1,980 $24,307 $7,552,968 

 As of December 31, 2020
 Cash and cash equivalentsOther Current AssetsNon-current AssetsTotal
 (in thousands)
Cash$3,331,860 $1,783 $31,284 $3,364,927 
Level 1 securities:
Money market funds4,573,690 — 253 4,573,943 
Level 2 securities:
Foreign Time Deposits300,000 — — 300,000 
$8,205,550 $1,783 $31,537 $8,238,870 
Other current assets include restricted cash for deposits related to self insurance. Non-current assets include restricted cash related to letter of credit agreements. The fair value of cash equivalents included in the Level 2 category is based on observable inputs, such as quoted prices for similar assets at the measurement date; quoted prices in markets that are not active; or other inputs that are observable, either directly or indirectly.
See Note 6 Debt to the consolidated financial statements for further information regarding the fair value of the Company’s senior notes.
There were no material gross realized gains or losses in the three and nine months ended September 30, 2021 and 2020, respectively.