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FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Fair Value Disclosures [Abstract] |  |  |
Carrying value of investments in equity securities without readily determinable fair value | $ 14,200,000 |  | $ 14,200,000
Gross unrealized losses of downward adjustments to the carrying value of equity securities without readily determinable fair values | 2,100,000 |  |
Impairment charge on equity securities without readily determinable fair value | $ 0 | $ 0 |

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