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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Property, plant and equipment [Abstract] |  |
Property, plant and equipment, net | $ 58,763 | $ 46,530
Machinery and equipment |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 45,954 | 44,549
Less: accumulated depreciation and amortization | (42,217) | (40,845)
Building |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 33,635 | 32,461
Less: accumulated depreciation and amortization | (12,234) | (11,501)
Leasehold improvements |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 5,715 | 5,539
Less: accumulated depreciation and amortization | (4,538) | (4,288)
Construction in progress |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 32,448 | 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 | 22,800 |
Construction in progress manufacturing equipment purchases |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | 5,600 | 3,600
Construction in progress other consolidated subsidiaries |  |
Property, plant and equipment [Abstract] |  |
Property, plant and equipment, gross | $ 4,000 | $ 2,200

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