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Summary of Significant Accounting Policies Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Inventory, Raw Materials, Gross $ 3,182 $ 3,564
Inventory, Work in Process, Gross 153 232
Inventory, Finished Goods, Gross 908 884
Inventory, Gross $ 4,243 4,680
Prior Year Reclass of Accrual   $ 5,700