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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 5,467 $ 5,246
Accumulated depreciation (4,603) (4,511)
Property, plant and equipment, net 864 735
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 634 589
Enterprise Hardware and Software [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 1,802 1,739
Property, plant and equipment, estimated useful life 3 years  
Leaseholds [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 1,797 1,695
Property, plant and equipment, estimated useful life Lesser of lease term or estimated useful life  
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 1,032 1,025
Property, plant and equipment, estimated useful life 7 years  
Furniture [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 202 $ 198
Property, plant and equipment, estimated useful life 5 years  
Buildings [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, estimated useful life 30 years