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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Marketable Securities (Details) - USD ($) | 8 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2018
Accounting Policies [Abstract] |  |  |  |
Marketable securities |  | $ 0 | $ 7,055,000 |
Cost basis of marketable securities |  |  | 6,900,000 |
Gross unrealized gain |  |  | 113,000 |
Carrying value |  |  | 7,100,000 |
Realized gain (loss) on marketable securities | $ 0 | $ 3,378,000 | $ 0 | $ 0

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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