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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, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer funds | $ 4,046,346 | $ 3,170,430
Bitcoin investment |  | 339,898
Safeguarding asset related to bitcoin held for other parties | 1,681,111 | 1,038,585
Safeguarding obligation liability related to bitcoin held for other parties | (1,681,111) | (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 | 1,610 | 8,267
Bitcoin investment | 573,302 | 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 | 3,711,722 | 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 | 1,403,811 | 960,705
Restricted cash | 292,184 | 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 | 44,577 | 29,788
Short-term debt securities | 370,063 | 539,998
Long-term debt securities | 89,146 | 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
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 | 932,384 | 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 | 1,681,111 | 1,038,585
Safeguarding obligation liability related to bitcoin held for other parties | (1,681,111) | (1,038,585)
Total assets (liabilities) measured at fair value | 304,533 | 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 | 57,722 | 67,515
Fair Value, Measurements, Recurring | Level 2 | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 1,875 | 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 | 555 | 699
Short-term debt securities | 134,532 | 215,227
Long-term debt securities | 96,384 | 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 | 500 | 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 | 724 | 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 | 9,253 | 9,165
Long-term debt securities | 2,392 | 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 | 596 | 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
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

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