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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 5,202	$ 5,174	$ 4,886
Accumulated depreciation	(4,103)	(3,876)	(3,803)
Property, plant and equipment, net	1,099	1,298	1,083
Buildings and Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	579	579	556
Enterprise Hardware and Software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,743	1,744	1,532
Leaseholds [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,702	1,705	1,504
Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	979	971	940
Furniture [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 199	$ 175	$ 354

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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