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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, plant and equipment [Abstract]
Property, plant and equipment, net	$ 74,754	$ 46,530
Machinery and equipment
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	47,875	44,549
Less: accumulated depreciation and amortization	(41,034)	(40,845)
Building
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	39,374	32,461
Less: accumulated depreciation and amortization	(11,792)	(11,501)
Leasehold improvements
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	5,384	5,539
Less: accumulated depreciation and amortization	(4,411)	(4,288)
Construction in progress
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	39,358	20,615
Construction in progress Dingxin location
Property, plant and equipment [Abstract]
Property, plant and equipment, gross		14,800
Construction in progress Dingxin and Chaoyang locations
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	24,900
Construction in progress manufacturing equipment purchases
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	5,200	3,600
Construction in progress other consolidated subsidiaries
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 9,300	$ 2,200

X

- Definition

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

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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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