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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, net | $ 84,975 | $ 82,280
Machinery and equipment |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 45,446 | 51,496
Less: accumulated depreciation and amortization | (36,360) | (41,431)
Building |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 39,599 | 39,775
Less: accumulated depreciation and amortization | (12,103) | (12,147)
Leasehold improvements |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 5,599 | 5,464
Less: accumulated depreciation and amortization | (4,671) | (4,497)
Construction in progress |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 47,465 | 43,620
Construction in progress Dingxin and Chaoyang locations |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 34,100 | 31,700
Construction in progress manufacturing equipment purchases |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 3,900 | 2,200
Construction in progress other consolidated subsidiaries |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | $ 9,500 | $ 9,700

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