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Inventories - Reserve Rollforward (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Inventory, Reserve [Roll Forward]    
Beginning balance $ (2,894) $ (3,518)
Accrual (98) 281
Reduction due to sold inventory 36 343
Reserves for excess, obsolete, and slow-moving inventories $ (2,956) $ (2,894)