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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 |

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