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ACCRUED LIABILITIES - Accrued Liabilities on the Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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ACCRUED LIABILITIES. |  |
Royalties payable | $ 1,151 | $ 1,166
Other Accrued Liabilities | 1,218 | 1,104
Total accrued Liabilities | $ 2,369 | $ 2,270

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