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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Schedule of Financial Assets Subject to Fair Value Measurements on a Recurring Basis by Level Within the Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost $ 1,893,638 $ 1,369,947
Long-term investments 555,521 461,029
Short-term investments 1,578,283 2,489,798
Related Party    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 15,000 0
Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost 1,893,638 1,369,947
Gross Unrealized Gains 8,873 3,869
Gross Unrealized Losses (105) (2,772)
Long-term investments 555,521 461,029
Total, amortized cost 4,018,674 4,319,677
Total, estimated fair value 4,027,442 4,320,774
Short-term investments 1,578,283 2,489,798
Fair Value, Recurring | Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost 755,638 516,673
Cash, estimated fair value 755,638 516,673
Long-term investments 0 0
Short-term investments 0 0
Fair Value, Recurring | Level 1:    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost 1,043,539 803,274
Amortized cost 2,537,605 2,732,413
Gross Unrealized Gains 6,453 2,480
Gross Unrealized Losses (91) (2,073)
Estimated Fair Value 2,543,967 2,732,820
Long-term investments 436,379 291,009
Short-term investments 1,064,049 1,638,537
Fair Value, Recurring | Level 2:    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost 94,461 50,000
Amortized cost 725,431 1,070,591
Gross Unrealized Gains 2,420 1,389
Gross Unrealized Losses (14) (699)
Estimated Fair Value 727,837 1,071,281
Long-term investments 119,142 170,020
Short-term investments 514,234 851,261
Fair Value, Recurring | Money market funds | Level 1:    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost 743,253 698,702
Amortized cost 743,253 698,702
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 743,253 698,702
Long-term investments 0 0
Short-term investments 0 0
Fair Value, Recurring | U.S. Treasury securities | Level 1:    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost 300,286 104,572
Amortized cost 1,794,352 2,033,711
Gross Unrealized Gains 6,453 2,480
Gross Unrealized Losses (91) (2,073)
Estimated Fair Value 1,800,714 2,034,118
Long-term investments 436,379 291,009
Short-term investments 1,064,049 1,638,537
Fair Value, Recurring | Certificates of deposit | Level 2:    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost 3,002 0
Amortized cost 3,000 105,993
Gross Unrealized Gains 2 97
Gross Unrealized Losses 0 (22)
Estimated Fair Value 3,002 106,068
Long-term investments 0 0
Short-term investments 0 106,068
Fair Value, Recurring | Time Deposits | Level 2:    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost 60,000 50,000
Amortized cost 305,000 50,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 305,000 50,000
Long-term investments 0 0
Short-term investments 245,000 0
Fair Value, Recurring | Time Deposits | Level 2: | Related Party    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Estimated Fair Value 15,000  
Fair Value, Recurring | Commercial paper | Level 2:    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost 24,299 0
Amortized cost 72,321 299,248
Gross Unrealized Gains 48 191
Gross Unrealized Losses (1) (8)
Estimated Fair Value 72,368 299,431
Long-term investments 0 0
Short-term investments 48,069 299,431
Fair Value, Recurring | Corporate debt securities | Level 2:    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, amortized cost 7,160 0
Amortized cost 345,110 615,350
Gross Unrealized Gains 2,370 1,101
Gross Unrealized Losses (13) (669)
Estimated Fair Value 347,467 615,782
Long-term investments 119,142 170,020
Short-term investments $ 221,165 $ 445,762