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Inventory (Tables) | 9 Months Ended
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Sep. 30, 2017
Inventory Disclosure [Abstract] |
Inventory | Inventory consisted of the following at September 30, 2017 and December 31, 2016 (in thousands):
| September 30, |  |  | December 31, |
| 2017 |  |  | 2016 |
Finished goods | $ | 1,332 |  |  | $ | — |
Work-in-process |  | 3,910 |  |  |  | 1,803 |
Raw materials and supplies |  | 35,430 |  |  |  | 18,388 |
Inventory | $ | 40,672 |  |  | $ | 20,191 |

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