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CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS - Cash and Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Cash and cash equivalents | $ 367,014 | $ 208,802
AFS Securities |  |
Adjusted cost basis | 147,900 |
Unrealized gains | 11 |
Unrealized losses | (780) |
Debt securities, fair market value and recorded basis | 147,131 |
HTM Securities |  |
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis | 89,945 | 304,804
Unrealized gains | 0 | 8
Unrealized losses | (213) | 0
Fair market value | 89,732 | 304,812
Debt securities, available-for-sale and held-to-maturity, Adjusted cost basis | 949,286 | 937,700
Debt securities, available-for-sale and held-to-maturity, Unrealized gains | 11 | 8
Debt securities, available-for-sale and held-to-maturity, Unrealized losses | (993) | 0
Debt securities, available-for-sale and held-to-maturity, fair value | 948,304 | 937,708
Debt securities, available-for-sale and held-to-maturity | 948,517 | 937,700
Cash and Cash Equivalents |  |
AFS Securities |  |
Debt securities, fair market value and recorded basis | 1,514 |
HTM Securities |  |
Debt securities, available-for-sale and held-to-maturity | 367,014 | 208,802
Short-Term Investments |  |
AFS Securities |  |
Debt securities, fair market value and recorded basis | 145,617 |
HTM Securities |  |
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis | 89,945 | 304,804
Debt securities, available-for-sale and held-to-maturity | 581,503 | 728,898
Level 1 | U.S. Treasury bills |  |
AFS Securities |  |
Adjusted cost basis | 547 |
Unrealized gains | 0 |
Unrealized losses | (10) |
Debt securities, fair market value and recorded basis | 537 |
Level 1 | U.S. Treasury bills | Short-Term Investments |  |
AFS Securities |  |
Debt securities, fair market value and recorded basis | 537 |
Level 2 | U.S. Treasury bills |  |
HTM Securities |  |
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis |  | 199,981
Unrealized gains |  | 8
Unrealized losses |  | 0
Fair market value |  | 199,989
Level 2 | U.S. Treasury bills | Short-Term Investments |  |
HTM Securities |  |
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis |  | 199,981
Level 2 | Government and governmental agencies |  |
AFS Securities |  |
Adjusted cost basis | 7,786 |
Unrealized gains | 0 |
Unrealized losses | (32) |
Debt securities, fair market value and recorded basis | 7,754 |
Level 2 | Government and governmental agencies | Short-Term Investments |  |
AFS Securities |  |
Debt securities, fair market value and recorded basis | 7,754 |
Level 2 | Corporate debt securities |  |
AFS Securities |  |
Adjusted cost basis | 139,567 |
Unrealized gains | 11 |
Unrealized losses | (738) |
Debt securities, fair market value and recorded basis | 138,840 |
HTM Securities |  |
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis | 89,945 | 104,823
Unrealized gains | 0 | 0
Unrealized losses | (213) | 0
Fair market value | 89,732 | 104,823
Level 2 | Corporate debt securities | Cash and Cash Equivalents |  |
AFS Securities |  |
Debt securities, fair market value and recorded basis | 1,514 |
Level 2 | Corporate debt securities | Short-Term Investments |  |
AFS Securities |  |
Debt securities, fair market value and recorded basis | 137,326 |
HTM Securities |  |
Debt securities, held-to-maturity, Adjusted cost basis and Recorded basis | 89,945 | 104,823
Cash |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cash and cash equivalents, fair value | 7,173 | 3,139
Cash | Cash and Cash Equivalents |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cash and cash equivalents | 7,173 | 3,139
Money market funds | Level 1 |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cash and cash equivalents, fair value | 217,498 | 64,668
Money market funds | Level 1 | Cash and Cash Equivalents |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cash and cash equivalents | 217,498 | 64,668
Certificate of deposits and term deposits | Level 2 |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cash and cash equivalents, fair value | 486,770 | 565,089
Certificate of deposits and term deposits | Level 2 | Cash and Cash Equivalents |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cash and cash equivalents | 140,829 | 140,995
Certificate of deposits and term deposits | Level 2 | Short-Term Investments |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cash and cash equivalents | $ 345,941 | $ 424,094

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