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Inventories - Reserve Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Inventory, Reserve [Roll Forward]    
Beginning balance $ (3,518) $ (4,085)
Accrual 281 (814)
Reduction due to sold inventory 343 845
Write-off for disposed inventory 0 536
Reserves for excess, obsolete, and slow-moving inventories $ (2,894) $ (3,518)