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Inventories | 3 Months Ended
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Mar. 31, 2019
Inventory Disclosure [Abstract] |
Inventories | Inventories Sand inventories consisted of the following:
| March 31, 2019 |  | December 31, 2018
Raw material | $ | 978 |  |  | $ | 1,201 |
Work in progress | 8,401 |  |  | 10,070 |
Finished goods | 3,047 |  |  | 4,648 |
Spare parts | 1,145 |  |  | 1,356 |
Total sand inventory | $ | 13,571 |  |  | $ | 17,275 |
Wellsite proppant storage solutions inventory represents work in progress inventory related to existing arrangements at the time the Company acquired Quickthree and consisted of the following:
| March 31, 2019 |  | December 31, 2018
Work in progress | $ | — |  |  | $ | 1,300 |
Total wellsite proppant storage solutions inventory | $ | — |  |  | $ | 1,300 |
Total inventory | $ | 13,571 |  |  | $ | 18,575 |

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