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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross $ 5,232 $ 5,232 $ 5,174
Accumulated depreciation (4,427) (4,307) (3,876)
Property, plant and equipment, net 805 925 1,298
Buildings and Land [Member]      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross 589 589 579
Enterprise Hardware and Software [Member]      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross $ 1,742 $ 1,742 1,744
Property, plant and equipment, estimated useful life 3 years 3 years  
Leaseholds [Member]      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross $ 1,700 $ 1,701 1,705
Property, plant and equipment, estimated useful life Lesser of lease term or estimated useful life Lesser of lease term or estimated useful life  
Equipment [Member]      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross $ 1,003 $ 1,002 971
Property, plant and equipment, estimated useful life 7 years 7 years  
Furniture [Member]      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross $ 198 $ 198 $ 175
Property, plant and equipment, estimated useful life 5 years 5 years  
Buildings [Member]      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, estimated useful life 30 years 30 years