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Inventories - Narratives (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Inventory |  |  |  |
Charged to provisions |  | $ 12,261 | $ 5,659 |
Inventory valuation reserves |  | 11,058 | 5,698 | $ 2,117
Excess terpene |  |  |  |
Inventory |  |  |  |
Charged to provisions |  | 400 |  |
Inventory valuation reserves |  | $ 6,900 | $ 4,400 |
Chemistry Technologies |  |  |  |
Inventory |  |  |  |
Charged to provisions | $ 8,400 |  |  |
Data Analytics |  |  |  |
Inventory |  |  |  |
Charged to provisions | $ 3,900 |  |  |

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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