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Leases (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Lessee, Lease, Description [Line Items]        
Amount of Lease-related assets and liabilities pre-tax reduction to retained earnings $ 3   $ 3  
Lease expense $ 2,335 $ 19 $ 4,593 $ 40
Terminate lease 1 year   1 year  
Increase in gross cash outflows when control of additional manufacturing space commences during the fourth quarter of 2019 $ 61   $ 61  
2019 46   46  
2020 32   32  
2021 21   21  
2022 15   15  
2023 and thereafter 65   65  
Salt Lake City, Utah [Member]        
Lessee, Lease, Description [Line Items]        
Property, plant, and equipment, net value 173   173  
Gross cost 208   208  
Accumulated depreciation $ 35   $ 35  
Minimum [Member]        
Lessee, Lease, Description [Line Items]        
Remaining lease term     1 year  
Maximum [Member]        
Lessee, Lease, Description [Line Items]        
Remaining lease term     11 years  
Lease renewal term 10 years   10 years