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Inventory | 12 Months Ended
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Dec. 31, 2021
Inventory Disclosure [Abstract] |
Inventory | 5. Inventory Inventory consisted of the following at December 31, 2021 and 2020 (in thousands):
|  | 2021 |  |  | 2020 |
Finished goods |  | $ | 515 |  |  | $ | 600 |
Work-in-process |  |  | 882 |  |  |  | 802 |
Raw materials and supplies |  |  | 40,962 |  |  |  | 31,683 |
Inventory |  | $ | 42,359 |  |  | $ | 33,085 |
We maintain certain surplus quantities of spare parts that serve as backup components and maintenance materials for our directional drilling and Colombia contract drilling operations. In 2021, advances in technologies rendered certain directional drilling equipment, and spare parts used to service that equipment, obsolete. Based on our assessment of limited alternative uses or active markets to recapture costs, we recorded a write-down of $4.0 million. The write-down is recorded in "Operating costs and expenses - Directional drilling" in the consolidated statements of operations.

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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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