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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, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer funds: | $ 4,182,872 | $ 3,170,430
Short-term debt securities: | 403,426 | 851,901
Long-term debt securities: | 471,977 | 251,127
Bitcoin investment | 792,282 | 339,898
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Bitcoin investment | 792,282 | 339,898
Investment in marketable equity securities | 5,407 | 8,267
Total assets (liabilities) measured at fair value | 3,419,298 | 3,356,213
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 assets (liabilities) measured at fair value | 445,869 | 415,335
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 assets (liabilities) measured at fair value | 0 | 0
Money market funds | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents: | 857,196 | 960,705
Restricted Cash: | 319,800 | 291,374
Customer funds: | 4,645 | 4,042
Money market funds | Fair Value, Measurements, Recurring | Level 2 |  |
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
Money market funds | Fair Value, Measurements, Recurring | Level 3 |  |
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
Reverse repurchase agreement | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer funds: | 982,974 | 1,028,754
Reverse repurchase agreement | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer funds: | 0 | 0
Reverse repurchase agreement | Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer funds: | 0 | 0
U.S. agency securities | Fair Value, Measurements, Recurring | Level 1 |  |
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
U.S. agency securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | 34,468 | 67,515
Long-term debt securities: | 49,030 | 0
U.S. agency securities | Fair Value, Measurements, Recurring | Level 3 |  |
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
U.S. government securities | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents: | 26,951 | 29,788
Short-term debt securities: | 206,785 | 539,998
Long-term debt securities: | 223,258 | 153,387
U.S. government securities | Fair Value, Measurements, Recurring | Level 2 |  |
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
U.S. government securities | Fair Value, Measurements, Recurring | Level 3 |  |
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
Commercial paper | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents: | 0 | 0
Commercial paper | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents: | 509 | 4,993
Commercial paper | Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents: | 0 | 0
Corporate bonds | Fair Value, Measurements, Recurring | Level 1 |  |
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
Corporate bonds | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents: | 0 | 699
Short-term debt securities: | 160,390 | 215,227
Long-term debt securities: | 195,344 | 95,328
Corporate bonds | Fair Value, Measurements, Recurring | Level 3 |  |
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
Commercial paper | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | 0 | 0
Commercial paper | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | 333 | 15,159
Commercial paper | Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | 0 | 0
Municipal securities | Fair Value, Measurements, Recurring | Level 1 |  |
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
Municipal securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | 399 | 9,165
Long-term debt securities: | 4,345 | 2,412
Municipal securities | Fair Value, Measurements, Recurring | Level 3 |  |
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
Certificates of deposit | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | 0 | 0
Certificates of deposit | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | 1,051 | 3,856
Certificates of deposit | Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | 0 | 0
Foreign government securities | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | 0 | 0
Foreign government securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | 0 | 981
Foreign government securities | Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term debt securities: | $ 0 | $ 0

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