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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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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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

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3).

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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)
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Amount of investment in marketable security.

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-SubTopic 210
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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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