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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019
Property, plant and equipment |  |  |  |  |  |  |  |  |
Property, plant, and equipment, gross | $ 96,735 | $ 32,376 |  |  |  |  |  |  |
Less: accumulated depreciation | (22,186) | (17,417) |  |  |  |  |  |  |
Property, plant, and equipment, net | 74,549 | 14,959 |  | $ 64,820 | $ 60,018 | $ 16,591 | $ 14,990 | $ 14,228 | $ 13,615
Depreciation expense | 4,800 | 3,600 | $ 2,600 |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |
Property, plant, and equipment, gross | 1,165 |  |  |  |  |  |  |  |
Leasehold Improvements |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |
Property, plant, and equipment, gross | 1,121 | 862 |  |  |  |  |  |  |
Software, machinery and equipment |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |
Property, plant, and equipment, gross | $ 94,449 | $ 31,514 |  |  |  |  |  |  |

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