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Certain Balance Sheet Items Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory [Line Items]    
Inventory, Raw Materials, Net of Reserves $ 119 $ 92
Inventory, Work in Process, Net of Reserves 167 137
Inventory, Finished Goods, Net of Reserves 272 524
Inventories $ 558 $ 753