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STOCK-BASED COMPENSATION - 2015 EIP Restricted Stock (Details) - 2015 EIP Plan - Restricted Stock - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2018
Stock Awards |  |
Vesting period of awards | 3 years |
Number of Shares |  |
Balance at the beginning of the period (in shares) |  | 6,802
Vested (in shares) |  | (6,802)
Weighted Average Fair Value |  |
Balance at the beginning of the period (in dollars per share) |  | $ 5.20
Vested (in dollars per share) |  | $ 5.20
Additional disclosures |  |
Total fair value of shares vested |  | $ 60
General and Administrative Expense |  |
Additional disclosures |  |
Recognized nonvested stock amortization expense |  | $ 11

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