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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 |  |

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