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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 5,023	$ 4,886	$ 4,638
Accumulated depreciation	(3,770)	(3,803)	(3,506)
Property, plant and equipment, net	1,253	1,083	1,132
Buildings and Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	574	556	556
Enterprise Hardware and Software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,648	1,532	1,520
Leaseholds [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,659	1,504	1,305
Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	960	940	902
Furniture [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 182	$ 354	$ 355

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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X

- 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.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(13))
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