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Inventory | 12 Months Ended
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Dec. 31, 2021
Inventory |
Inventory | Note 5. Inventory Our inventory balance consists of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ |  | 2021 | ​ | 2020 | ​
Raw materials | ​ | $ | 1,275 | ​ | $ | 1,275 | ​
Work-in-process | ​ | ​ | 39,895 | ​ | ​ | 21,242 | ​
Finished goods | ​ |  | 15,768 | ​ |  | 13,456 | ​
Total inventory | ​ | $ | 56,938 | ​ | $ | 35,973 | ​
​ Inventories, stated at the lower of cost and net realizable value, consist of raw materials, work-in-process and finished goods. At December 31, 2021, $27.9 million of inventory was classified as current on the consolidated balance sheet as we expect this inventory to be consumed for commercial use within the next twelve months. At December 31, 2021, $29.0 million of inventory was classified as non-current on the consolidated balance sheet as we did not expect this inventory to be consumed for commercial use within the next twelve months. We obtain some inventory components from a limited number of suppliers due to technology, availability, price, quality or other considerations. The loss of a supplier, the deterioration of our relationship with a supplier, or any unilateral violation of the contractual terms under which we are supplied components by a supplier could adversely affect our total revenues and gross margins. We capitalize inventory after FDA approval as the related costs are expected to be recoverable through the commercialization of the product. Costs incurred prior to FDA approval are recorded as research and development expense in our statements of operations. At December 31, 2021, inventory with approximately $71.9 million of product costs incurred prior to FDA approval had not yet been sold. We expect to sell the pre commercialization inventory over the next 36 months and, as a result, cost of product revenues will reflect a lower average per unit cost of materials.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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