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Inventories - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Inventory [Line Items] |  |
Inventory reserve | $ 17,108 | $ 20,125
Supply and Offtake Agreements |  |
Inventory [Line Items] |  |
Obligation to purchase inventory | 371 |
Purchase commitment | 5,681 |
Inventory held at assemblers | $ 3,123 |

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