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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Property, plant and equipment [Abstract] |  |
Property, plant and equipment, net | $ 82,280 | $ 46,530
Machinery and equipment |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 51,496 | 44,549
Less: accumulated depreciation and amortization | (41,431) | (40,845)
Building |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 39,775 | 32,461
Less: accumulated depreciation and amortization | (12,147) | (11,501)
Leasehold improvements |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 5,464 | 5,539
Less: accumulated depreciation and amortization | (4,497) | (4,288)
Construction in progress |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 43,620 | 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 | 31,700 |
Construction in progress manufacturing equipment purchases |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 2,200 | 3,600
Construction in progress other consolidated subsidiaries |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | $ 9,700 | $ 2,200

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