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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Customer funds: $ 4,771,824 $ 4,182,872  
Bitcoin investment 777,515 792,282 $ 339,898
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Bitcoin investment 777,515 792,282  
Investment in marketable equity securities 5,225 5,407  
Total 3,243,215 3,419,298  
Level 1 | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents: 608,807 857,196  
Restricted Cash: 293,514 319,800  
Customer funds: 0 4,645  
Level 1 | U.S. government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents: 4,963 26,951  
Short-term debt securities: 344,627 206,785  
Long-term debt securities: 100,467 223,258  
Level 1 | Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents: 0 0  
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  
Level 1 | Reverse repurchase agreement      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Customer funds: 1,108,097 982,974  
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  
Level 1 | Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Short-term debt securities: 0 0  
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  
Level 1 | Certificates of deposit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Short-term debt securities: 0 0  
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Bitcoin investment 0 0  
Investment in marketable equity securities 0 0  
Total 326,651 445,869  
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  
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  
Level 2 | Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents: 64,805 509  
Level 2 | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents: 276 0  
Short-term debt securities: 59,119 160,390  
Long-term debt securities: 81,469 195,344  
Level 2 | Reverse repurchase agreement      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Customer funds: 0 0  
Level 2 | U.S. agency securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Short-term debt securities: 19,035 34,468  
Long-term debt securities: 0 49,030  
Level 2 | Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Short-term debt securities: 92,655 333  
Level 2 | Municipal securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Short-term debt securities: 130 399  
Long-term debt securities: 6,951 4,345  
Level 2 | Certificates of deposit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Short-term debt securities: 2,211 1,051  
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Bitcoin investment 0 0  
Investment in marketable equity securities 0 0  
Total 0 0  
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  
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  
Level 3 | Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents: 0 0  
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  
Level 3 | Reverse repurchase agreement      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Customer funds: 0 0  
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  
Level 3 | Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Short-term debt securities: 0 0  
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  
Level 3 | Certificates of deposit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Short-term debt securities: $ 0 $ 0