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CASH, CASH EQUIVALENTS AND INVESTMENTS - Additional Information (Details) | Sep. 30, 2021 USD ($) Investment | Dec. 31, 2020 USD ($)
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Cash And Cash Equivalents [Line Items] |  |
Number of Minority Investments | Investment | 2 |
Cost Method Minority Investment Carrying Value | $ 8,000,000.0 |
Number Of Convertible Note Investments | Investment | 1 |
Available-for-sale Securities, Fair Value Disclosure | $ 253,786,000 | $ 99,996,000
Fair Value, Inputs, Level 3 [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Available-for-sale Securities, Fair Value Disclosure | $ 500,000 |

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