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Inventory | 6 Months Ended
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Jun. 30, 2019
Inventory Disclosure [Abstract] |
Inventory | Inventory Inventory consists of the following (in thousands):
| June 30, 2019 |  | December 31, 2018
Raw materials | $ | 1,757 |  |  | $ | 1,846 |
Work-in-process | 6,961 |  |  | 6,403 |
Finished goods | 4,470 |  |  | 3,132 |
Total inventory | $ | 13,188 |  |  | $ | 11,381 |
Inventory is generally manufactured upon receipt of firm purchase orders from our collaboration partners. Inventory includes direct materials, direct labor, and manufacturing overhead and cost is determined on a first-in, first-out basis for raw materials and on a specific identification basis for work-in-process and finished goods. Inventory is valued at the lower of cost or net realizable value and defective or excess inventory is written down to net realizable value based on historical experience or projected usage. Inventory related to our research and development activities is expensed as manufactured by us or when purchased. Before the regulatory approval of our drug candidates, we recognize research and development expense for the manufacture of drug products that could potentially be available to support the commercial launch of our drug candidates, if approved.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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