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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, plant and equipment [Abstract] |  |  |
Property, plant and equipment, net | $ 46,530 | $ 27,805 |
Depreciation and amortization | 4,422 | 4,865 | $ 5,494
Machinery and equipment |  |  |
Property, plant and equipment [Abstract] |  |  |
Property, plant and equipment, gross | 44,549 | 41,254 |
Less: accumulated depreciation and amortization | (40,845) | (37,311) |
Building |  |  |
Property, plant and equipment [Abstract] |  |  |
Property, plant and equipment, gross | 32,461 | 29,600 |
Less: accumulated depreciation and amortization | (11,501) | (9,654) |
Leasehold improvements |  |  |
Property, plant and equipment [Abstract] |  |  |
Property, plant and equipment, gross | 5,539 | 4,942 |
Less: accumulated depreciation and amortization | (4,288) | (3,608) |
Construction in progress |  |  |
Property, plant and equipment [Abstract] |  |  |
Property, plant and equipment, gross | 20,615 | $ 2,582 |
Construction in progress Dingxin location |  |  |
Property, plant and equipment [Abstract] |  |  |
Property, plant and equipment, gross | 14,800 |  |
Construction in progress manufacturing equipment purchases |  |  |
Property, plant and equipment [Abstract] |  |  |
Property, plant and equipment, gross | 3,600 |  |
Construction in progress other consolidated subsidiaries |  |  |
Property, plant and equipment [Abstract] |  |  |
Property, plant and equipment, gross | $ 2,200 |  |

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