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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, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Customer funds $ 4,803,716     $ 4,182,872        
Bitcoin investment 1,001,419 $ 931,656 $ 708,450 792,282 $ 529,581 $ 514,584 $ 573,302 $ 339,898
Level 1 | Fair Value, Measurements, Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Bitcoin investment 1,001,419     792,282        
Investment in marketable equity securities 5,808     5,407        
Total 4,986,029     3,419,298        
Level 1 | Fair Value, Measurements, Recurring | Money market funds                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 2,268,416     857,196        
Restricted cash 96,641     319,800        
Customer funds 4,645     4,645        
Level 1 | Fair Value, Measurements, Recurring | U.S. government securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 79,582     26,951        
Short-term debt securities 271,717     206,785        
Long-term debt securities 118,679     223,258        
Level 1 | Fair Value, Measurements, Recurring | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     0        
Level 1 | Fair Value, Measurements, Recurring | 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 | Fair Value, Measurements, Recurring | Reverse repurchase agreement                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Customer funds 1,139,122     982,974        
Level 1 | Fair Value, Measurements, Recurring | 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 | Fair Value, Measurements, Recurring | Certificates of deposit                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Level 1 | Fair Value, Measurements, Recurring | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Level 1 | Fair Value, Measurements, Recurring | 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 2 | Fair Value, Measurements, Recurring                
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 158,800     445,869        
Level 2 | Fair Value, Measurements, Recurring | 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 | Fair Value, Measurements, Recurring | 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 | Fair Value, Measurements, Recurring | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 1,564     509        
Level 2 | Fair Value, Measurements, Recurring | Corporate bonds                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 76     0        
Short-term debt securities 65,231     160,390        
Long-term debt securities 47,557     195,344        
Level 2 | Fair Value, Measurements, Recurring | Reverse repurchase agreement                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Customer funds 0     0        
Level 2 | Fair Value, Measurements, Recurring | U.S. agency securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 24,029     34,468        
Long-term debt securities 5,005     49,030        
Level 2 | Fair Value, Measurements, Recurring | Certificates of deposit                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 1,246     1,051        
Level 2 | Fair Value, Measurements, Recurring | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 8,418     333        
Level 2 | Fair Value, Measurements, Recurring | Municipal securities                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 131     399        
Long-term debt securities 5,543     4,345        
Level 3 | Fair Value, Measurements, Recurring                
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 | Fair Value, Measurements, Recurring | 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 | Fair Value, Measurements, Recurring | 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 | Fair Value, Measurements, Recurring | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash equivalents 0     0        
Level 3 | Fair Value, Measurements, Recurring | 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 | Fair Value, Measurements, Recurring | Reverse repurchase agreement                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Customer funds 0     0        
Level 3 | Fair Value, Measurements, Recurring | 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 | Fair Value, Measurements, Recurring | Certificates of deposit                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Level 3 | Fair Value, Measurements, Recurring | Commercial paper                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Short-term debt securities 0     0        
Level 3 | Fair Value, Measurements, Recurring | 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