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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
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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 |  |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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