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Inventory (Tables) | 9 Months Ended
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Sep. 30, 2021
Inventory Disclosure [Abstract] |
Inventory | Inventories are stated at the lower of cost, determined on the first-in, first-out (“FIFO”) basis, or net realizable value, net of an inventory valuation allowance. We use a standard cost methodology to determine the cost basis for its inventories. Costs include allocations for materials, labor, and overhead. All variances between actual costs and standard costs are apportioned to inventory and cost of goods sold based upon inventory turnover. We evaluate inventory on a quarterly basis for obsolete or slow-moving items to ascertain if the recorded allowance is reasonable and adequate. Additional provisions are made to reduce excess, obsolete or slow-moving inventories to their net realizable value. Inventory consisted of the following at September 30, 2021 and December 31, 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2021 |  | December 31, 2020
Raw materials | ​ | $ | 33,951 | ​ | $ | 39,194
Finished goods | ​ |  | 59,328 | ​ |  | 50,764
Total inventory | ​ | $ | 93,279 | ​ | $ | 89,958

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