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Inventories, net - Summary of Inventories, Net (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Inventories, net |  |
Component parts | $ 4,263 | $ 3,841
Work-in-process and finished goods | 6,125 | 6,504
Total | $ 10,388 | $ 10,345

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