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OTHER ASSETS - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Jun. 21, 2016
Interest and Other Income |  |
Other Investment Not Readily Marketable [Line Items] |  |
Realized gain on investment | $ 27,700,000 |
Minimum |  |
Other Investment Not Readily Marketable [Line Items] |  |
Potential stock received upon conversion of investment (shares) |  | 0
Prepaid expenses and other current assets |  |
Other Investment Not Readily Marketable [Line Items] |  |
Assigned value of preferred shares | $ 0 | $ 0

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