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Property, Plant and Equipment, Net (Details) - USD ($)
$ / shares in Units, $ in Thousands
Jan. 01, 2020
Mar. 31, 2020
Dec. 31, 2019
Property, plant and equipment [Abstract]      
Property, plant and equipment, net   $ 97,490 $ 97,403
Service Life      
Property, plant and equipment [Abstract]      
Decrease in manufacturing costs as a result of lower depreciation $ 300    
Decrease in net loss per share, basic and diluted, as a result of lower depreciation $ 0.01    
Machinery and equipment      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross   44,797 45,742
Less: accumulated depreciation and amortization   (36,740) (37,115)
Building      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross   38,171 38,837
Less: accumulated depreciation and amortization   (12,846) (12,736)
Leasehold improvements      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross   4,849 4,877
Less: accumulated depreciation and amortization   (4,041) (4,035)
Construction in progress      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross   63,300 61,833
Construction in progress Dingxin and Kazuo locations      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross   50,200 48,800
Construction in progress manufacturing equipment purchases      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross   3,600 3,400
Construction in progress other consolidated subsidiaries      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross   $ 9,500 $ 9,600