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INVENTORIES (Tables) | 12 Months Ended
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Dec. 31, 2020
INVENTORIES |
Schedule of inventory | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ | ​ | 2020 |  | 2019
​ | ​ | (in thousands)
Raw materials | ​ | $ | 16,701 | ​ | $ | 12,365
Finished goods | ​ |  | 16,683 | ​ |  | 24,724
Materials and supplies | ​ |  | — | ​ |  | 453
Total | ​ | $ | 33,384 | ​ | $ | 37,542

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