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Inventories - Allowance (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Inventory Valuation Reserves [Roll Forward] |  |  |  |
Balance, beginning of period | $ 2,726 | $ 2,373 | $ 3,261 | $ 2,644
Provisions for excess and obsolete inventories | 86 | 1,969 | 378 | 1,776
Inventories written off | (520) | (230) | (1,347) | (308)
Balance, end of period | $ 2,292 | $ 4,112 | $ 2,292 | $ 4,112

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