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FAIR VALUE OF FINANCIAL INSTRUMENTS - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer funds | $ 2,649,114 | $ 2,037,832
Short-term debt securities | 868,809 | 695,112
Long-term debt securities | 1,451,107 | 463,950
U.S. agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer funds | 53,563 | 113,178
U.S. government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer funds | 412,261 | 333,346
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in marketable equity security | 0 | 376,258
Total | 5,779,927 | 4,052,716
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 2,495,120 | 1,694,736
Customer funds | 1,485,002 | 777,193
Fair Value, Measurements, Recurring | Level 1 | Reverse repurchase agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer funds | 402,097 | 246,880
Fair Value, Measurements, Recurring | Level 1 | U.S. agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 0 | 0
Customer funds | 0 | 0
Short-term debt securities | 0 | 0
Long-term debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 0 | 0
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 | 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 | U.S. government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 0 | 15,000
Customer funds | 546,205 | 445,142
Short-term debt securities | 308,323 | 405,434
Long-term debt securities | 543,180 | 92,073
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
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] |  |
Investment in marketable equity security | 0 | 0
Total | 1,571,127 | 863,219
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
Customer funds | 0 | 0
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 | U.S. agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 0 | 41,186
Customer funds | 53,564 | 160,478
Short-term debt securities | 94,088 | 154,004
Long-term debt securities | 152,691 | 169,278
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 1,500 | 0
Short-term debt securities | 8,200 | 0
Fair Value, Measurements, Recurring | Level 2 | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 46,150 | 0
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 1,500 | 0
Short-term debt securities | 290,523 | 77,199
Long-term debt securities | 704,097 | 176,014
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 | 141,551 | 4,999
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
Customer funds | 0 | 0
Short-term debt securities | 0 | 0
Long-term debt securities | 0 | 0
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 | 15,750 | 10,431
Long-term debt securities | 21,965 | 1,060
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 | 10,374 | 43,045
Long-term debt securities | 29,174 | 25,525
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in marketable equity security | 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
Customer funds | 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 | U.S. agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 0 | 0
Customer funds | 0 | 0
Short-term debt securities | 0 | 0
Long-term debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 0 | 0
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 | 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 | U.S. government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents | 0 | 0
Customer funds | 0 | 0
Short-term debt securities | 0 | 0
Long-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
Long-term debt securities | $ 0 | $ 0

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