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Accrued Expenses and Other Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2021
Accrued Expenses and Other Current Liabilities |
Schedule of Accrued Expenses and Other Current Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of
​ | ​ | September 30, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | (Unaudited) | ​ | ​ | ​
​ | ​ | (in thousands)
Accrued royalty payments | ​ | ​ | 1,401 | ​ | ​ | 1,796
Dividends payable | ​ | ​ | - | ​ | ​ | 247
Zinc derivatives | ​ | ​ | 144 | ​ | ​ | -
Employee profit sharing obligation | ​ | ​ | 1,569 | ​ | ​ | -
Other payables | ​ | ​ | 774 | ​ | ​ | 232
Total accrued expenses and other current liabilities | ​ | $ | 3,888 | ​ | $ | 2,275
​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued non-current labor obligation | ​ | ​ | 682 | ​ | ​ | -
Deferred stock unit ("DSU") compensation liability | ​ | ​ | 204 | ​ | ​ | -
Other long-term liabilities | ​ | ​ | 15 | ​ | ​ | 13
Total other non-current liabilities | ​ | $ | 901 | ​ | $ | 13

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