Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, plant and equipment [Abstract]
Property, plant and equipment, net	$ 97,403	$ 82,280
Machinery and equipment
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	45,742	51,496
Less: accumulated depreciation and amortization	(37,115)	(41,431)
Building
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	38,837	39,775
Less: accumulated depreciation and amortization	(12,736)	(12,147)
Leasehold improvements
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	4,877	5,464
Less: accumulated depreciation and amortization	(4,035)	(4,497)
Construction in progress
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	61,833	43,620
Construction in progress Dingxin and Chaoyang locations
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	48,800
Construction in progress Dingxin and Kazuo locations
Property, plant and equipment [Abstract]
Property, plant and equipment, gross		31,700
Construction in progress manufacturing equipment purchases
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	3,400	2,200
Construction in progress other consolidated subsidiaries
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 9,600	$ 9,700