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ACCRUED LIABILITIES - Accrued Liabilities on the Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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ACCRUED LIABILITIES. |  |
Royalties payable | $ 1,151 | $ 1,151
Other Accrued Liabilities | 978 | 1,218
Total accrued Liabilities | $ 2,129 | $ 2,369

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