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Summary of Significant Accounting Policies Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Inventory, Raw Materials, Gross $ 3,564 $ 616
Inventory, Work in Process, Gross 232 149
Inventory, Finished Goods, Gross 884 1,183
Inventory, Gross $ 4,680 $ 1,948