SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Financial Instruments Recognized at Fair Value on Recurring Basis (Details)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Available-for-sale securities, current	$ 1,520,000
Total current assets recorded at fair value	1,520,000
Restricted cash included in assets held for sale		$ 3,787,000
Restricted cash not included in assets held for sale	10,000	10,000
Total current assets recorded at fair value	$ 10,000	3,797,000
Discount for lack of marketability
Fair value of available-for-sale securities	375,000
Risk-free rate
Fair value of available-for-sale securities	0.0009
Volatility factor
Fair value of available-for-sale securities	0.891
Level 1
Restricted cash included in assets held for sale		3,787,000
Restricted cash not included in assets held for sale	$ 10,000	10,000
Total current assets recorded at fair value	10,000	3,797,000
Level 2
Available-for-sale securities, current
Total current assets recorded at fair value
Restricted cash included in assets held for sale
Restricted cash not included in assets held for sale
Total current assets recorded at fair value
Level 3
Available-for-sale securities, current	1,520,000
Total current assets recorded at fair value	1,520,000
Restricted cash included in assets held for sale
Restricted cash not included in assets held for sale
Total current assets recorded at fair value

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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