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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 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 $ 3,550,713   $ 3,170,430      
Bitcoin investment 514,584 $ 573,302 339,898 $ 244,916 $ 228,902 $ 102,303
Safeguarding asset related to bitcoin held for other parties 1,440,307   1,038,585      
Safeguarding obligation liability related to bitcoin held for other parties (1,440,307)   (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 1,628   8,267      
Bitcoin investment 514,584   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 4,457,051   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 1,389,565   960,705      
Restricted cash 149,221   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 183,120   29,788      
Short-term debt securities 488,215   539,998      
Long-term debt securities 216,399   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 1,509,674   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      
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 1,440,307   1,038,585      
Safeguarding obligation liability related to bitcoin held for other parties (1,440,307)   (1,038,585)      
Total assets (liabilities) measured at fair value 321,525   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 38,720   67,515      
Long-term debt securities 17   0      
Fair Value, Measurements, Recurring | Level 2 | Commercial paper            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Cash equivalents 5,506   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 875   699      
Short-term debt securities 119,125   215,227      
Long-term debt securities 142,018   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 1,238   3,856      
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 1,255   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 9,448   9,165      
Long-term debt securities 3,323   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      
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