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Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventory [Line Items] |  |
Total inventory | $ 19,136 | $ 21,415
Sand sales revenue |  |
Inventory [Line Items] |  |
Raw material | 428 | 527
Work in progress | 10,465 | 14,173
Finished goods | 4,400 | 4,097
Spare parts | 3,843 | 2,618
Total inventory | $ 19,136 | $ 21,415

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