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Inventories - Allowance (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Inventory Valuation Reserves [Roll Forward] |  |  |  |
Balance, beginning of period | $ 1,871 | $ 2,726 | $ 1,787 | $ 3,261
Provision (recovery of) for excess and obsolete inventories | 1,232 | 86 | 1,380 | 378
Inventories written off | (38) | (520) | (102) | (1,347)
Balance, end of period | $ 3,065 | $ 2,292 | $ 3,065 | $ 2,292

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- Definition Amount of valuation reserve for inventory. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.BB) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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