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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property, plant and equipment [Abstract]
Property, plant and equipment, net	$ 87,613	$ 82,280
Machinery and equipment
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	45,251	51,496
Less: accumulated depreciation and amortization	(36,672)	(41,431)
Building
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	39,144	39,775
Less: accumulated depreciation and amortization	(12,194)	(12,147)
Leasehold improvements
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	5,488	5,464
Less: accumulated depreciation and amortization	(4,652)	(4,497)
Construction in progress
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	51,248	43,620
Construction in progress Dingxin and Chaoyang locations
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	38,100	31,700
Construction in progress manufacturing equipment purchases
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	4,100	2,200
Construction in progress other consolidated subsidiaries
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 9,000	$ 9,700

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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