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FAIR VALUE MEASUREMENT - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Notes Payable, Current | $ 4,086 | $ 4,301
Seven Point Five Percentage Convertible Notes [Member] |  |
Notes Payable, Current | 57,900 |
Fair Value, Inputs, Level 3 [Member] | Seven Point Five Percentage Convertible Notes [Member] |  |
Convertible Debt, Fair Value Disclosures | 58,700 |
Notes Payable, Current | $ 57,900 |

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