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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Customer funds $ 3,933,785     $ 3,170,430        
Bitcoin investment 529,581 $ 514,584 $ 573,302 339,898 $ 216,742 $ 244,916 $ 228,902 $ 102,303
Safeguarding asset related to bitcoin held for other parties 1,412,948     1,038,585        
Safeguarding obligation liability related to bitcoin held for other parties (1,412,948)     (1,038,585)        
Fair Value, Measurements, Recurring | Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Investment in marketable equity securities 1,527     8,267        
Bitcoin investment 529,581     339,898        
Safeguarding asset related to bitcoin held for other parties 0     0        
Safeguarding obligation liability related to bitcoin held for other parties 0     0        
Total assets (liabilities) measured at fair value 3,521,265     3,356,213        
Fair Value, Measurements, Recurring | Level 1 | Money market funds                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 1,204,695     960,705        
Restricted cash 197,075     291,374        
Customer funds 4,645     4,042        
Fair Value, Measurements, Recurring | Level 1 | U.S. government securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 148,331     29,788        
Short-term debt securities 332,322     539,998        
Long-term debt securities 202,443     153,387        
Fair Value, Measurements, Recurring | Level 1 | U.S. agency securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Long-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 1 | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     0        
Fair Value, Measurements, Recurring | Level 1 | Corporate bonds                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     0        
Short-term debt securities 0     0        
Long-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 1 | Reverse repurchase agreement                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Customer funds 900,646     1,028,754        
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Long-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 1 | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 1 | Municipal securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Long-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 1 | Foreign government securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 2                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Investment in marketable equity securities 0     0        
Bitcoin investment 0     0        
Safeguarding asset related to bitcoin held for other parties 1,412,948     1,038,585        
Safeguarding obligation liability related to bitcoin held for other parties (1,412,948)     (1,038,585)        
Total assets (liabilities) measured at fair value 402,893     415,335        
Fair Value, Measurements, Recurring | Level 2 | Money market funds                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     0        
Restricted cash 0     0        
Customer funds 0     0        
Fair Value, Measurements, Recurring | Level 2 | U.S. government securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     0        
Short-term debt securities 0     0        
Long-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 2 | U.S. agency securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 33,772     67,515        
Long-term debt securities 39,034     0        
Fair Value, Measurements, Recurring | Level 2 | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 496     4,993        
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     699        
Short-term debt securities 137,464     215,227        
Long-term debt securities 186,785     95,328        
Fair Value, Measurements, Recurring | Level 2 | Reverse repurchase agreement                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Customer funds 0     0        
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 738     3,856        
Long-term debt securities 515     0        
Fair Value, Measurements, Recurring | Level 2 | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 598     15,159        
Fair Value, Measurements, Recurring | Level 2 | Municipal securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 92     9,165        
Long-term debt securities 3,399     2,412        
Fair Value, Measurements, Recurring | Level 2 | Foreign government securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     981        
Fair Value, Measurements, Recurring | Level 3                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Investment in marketable equity securities 0     0        
Bitcoin investment 0     0        
Safeguarding asset related to bitcoin held for other parties 0     0        
Safeguarding obligation liability related to bitcoin held for other parties 0     0        
Total assets (liabilities) measured at fair value 0     0        
Fair Value, Measurements, Recurring | Level 3 | Money market funds                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     0        
Restricted cash 0     0        
Customer funds 0     0        
Fair Value, Measurements, Recurring | Level 3 | U.S. government securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     0        
Short-term debt securities 0     0        
Long-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 3 | U.S. agency securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Long-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 3 | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     0        
Fair Value, Measurements, Recurring | Level 3 | Corporate bonds                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     0        
Short-term debt securities 0     0        
Long-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 3 | Reverse repurchase agreement                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Customer funds 0     0        
Fair Value, Measurements, Recurring | Level 3 | Certificates of deposit                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Long-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 3 | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 3 | Municipal securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Long-term debt securities 0     0        
Fair Value, Measurements, Recurring | Level 3 | Foreign government securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities $ 0     $ 0