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Supplemental Financial Statement Information - Summary of Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and short-term investments, cost or amortized cost $ 1,670,718 $ 2,149,289
Unrestricted cash equivalents and short-term investments, unrealized gains 699 161
Unrestricted cash equivalents and short-term investments, unrealized losses (2,277) (417)
Unrestricted cash equivalents and short-term investments, estimated fair value 1,669,140 2,149,033
Restricted cash equivalents and investments, cost or amortized cost 1,137,987 1,065,317
Restricted cash equivalents and investments, unrealized gains 419 78
Restricted cash equivalents and investments, unrealized losses (1,486) (379)
Restricted cash equivalents and investments, estimated fair value 1,136,920 1,065,016
Unrestricted and restricted cash equivalents and investments, cost or amortized cost 2,808,705 3,214,606
Unrestricted and restricted cash equivalents and investments, unrealized gains 1,118 239
Unrestricted and restricted cash equivalents and investments, unrealized losses (3,763) (796)
Total financial assets 2,806,060 3,214,049
Marketable securities 1,100  
Cash and cash equivalents and short-term investments 1,800,000 2,300,000
Restricted cash 1,300 53,700
Restricted cash and cash equivalents and restricted short-term investments 1,100,000 1,100,000
Cash and Cash Equivalents and Short-Term Investments    
Cash Equivalents and Short-Term Investments    
Cash 126,500 104,800
Money market funds    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and short-term investments, cost or amortized cost 3,276 22,250
Unrestricted cash equivalents and short-term investments, unrealized gains 0 0
Unrestricted cash equivalents and short-term investments, unrealized losses 0 0
Unrestricted cash equivalents and short-term investments, estimated fair value 3,276 22,250
Restricted cash equivalents and investments, cost or amortized cost 93,362 20,161
Restricted cash equivalents and investments, unrealized gains 0 0
Restricted cash equivalents and investments, unrealized losses 0 0
Restricted cash equivalents and investments, estimated fair value 93,362 20,161
Money market deposit accounts    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and short-term investments, cost or amortized cost 126,994 330,252
Unrestricted cash equivalents and short-term investments, unrealized gains 0 0
Unrestricted cash equivalents and short-term investments, unrealized losses 0 0
Unrestricted cash equivalents and short-term investments, estimated fair value 126,994 330,252
Term deposits    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and short-term investments, cost or amortized cost 5,000 385,000
Unrestricted cash equivalents and short-term investments, unrealized gains 0 0
Unrestricted cash equivalents and short-term investments, unrealized losses 0 0
Unrestricted cash equivalents and short-term investments, estimated fair value 5,000 385,000
Restricted cash equivalents and investments, cost or amortized cost 3,539 5,046
Restricted cash equivalents and investments, unrealized gains 0 0
Restricted cash equivalents and investments, unrealized losses 0 0
Restricted cash equivalents and investments, estimated fair value 3,539 5,046
Certificates of deposit    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and short-term investments, cost or amortized cost 502,374 505,562
Unrestricted cash equivalents and short-term investments, unrealized gains 295 25
Unrestricted cash equivalents and short-term investments, unrealized losses (510) (149)
Unrestricted cash equivalents and short-term investments, estimated fair value 502,159 505,438
Restricted cash equivalents and investments, cost or amortized cost 355,241 421,243
Restricted cash equivalents and investments, unrealized gains 174 35
Restricted cash equivalents and investments, unrealized losses (437) (134)
Restricted cash equivalents and investments, estimated fair value 354,978 421,144
Commercial paper    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and short-term investments, cost or amortized cost 964,410 806,446
Unrestricted cash equivalents and short-term investments, unrealized gains 403 132
Unrestricted cash equivalents and short-term investments, unrealized losses (1,663) (190)
Unrestricted cash equivalents and short-term investments, estimated fair value 963,150 806,388
Restricted cash equivalents and investments, cost or amortized cost 596,213 523,616
Restricted cash equivalents and investments, unrealized gains 243 43
Restricted cash equivalents and investments, unrealized losses (865) (169)
Restricted cash equivalents and investments, estimated fair value 595,591 523,490
Corporate bonds    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and short-term investments, cost or amortized cost 61,605 99,779
Unrestricted cash equivalents and short-term investments, unrealized gains 0 4
Unrestricted cash equivalents and short-term investments, unrealized losses (104) (78)
Unrestricted cash equivalents and short-term investments, estimated fair value 61,501 99,705
Restricted cash equivalents and investments, cost or amortized cost 14,933 63,506
Restricted cash equivalents and investments, unrealized gains 0 0
Restricted cash equivalents and investments, unrealized losses (17) (48)
Restricted cash equivalents and investments, estimated fair value 14,916 63,458
U.S. government securities    
Cash Equivalents and Short-Term Investments    
Unrestricted cash equivalents and short-term investments, cost or amortized cost 7,059  
Unrestricted cash equivalents and short-term investments, unrealized gains 1  
Unrestricted cash equivalents and short-term investments, unrealized losses 0  
Unrestricted cash equivalents and short-term investments, estimated fair value 7,060  
Restricted cash equivalents and investments, cost or amortized cost 74,699 31,745
Restricted cash equivalents and investments, unrealized gains 2 0
Restricted cash equivalents and investments, unrealized losses (167) (28)
Restricted cash equivalents and investments, estimated fair value $ 74,534 $ 31,717