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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Customer funds $ 5,248,730 $ 4,182,872    
Bitcoin investment 708,450 792,282 $ 573,302 $ 339,898
Fair Value, Measurements, Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Bitcoin investment 708,450 792,282    
Investment in marketable equity securities 4,532 5,407    
Total 3,310,154 3,419,298    
Fair Value, Measurements, Recurring | Level 1 | Money market funds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 1,159,181 857,196    
Restricted cash 89,017 319,800    
Customer funds 4,645 4,645    
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 32,890 26,951    
Short-term debt securities 221,484 206,785    
Long-term debt securities 157,543 223,258    
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 932,412 982,974    
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 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 249,980 445,869    
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 31,996 34,468    
Long-term debt securities 39,081 49,030    
Fair Value, Measurements, Recurring | Level 2 | Commercial paper        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 483 509    
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 69    
Short-term debt securities 99,283 160,390    
Long-term debt securities 72,677 195,344    
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 1,188 1,051    
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 585 333    
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 305 399    
Long-term debt securities 4,313 4,345    
Fair Value, Measurements, Recurring | 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    
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