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Property, Plant and Equipment, Net (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, plant and equipment [Abstract]      
Property, plant and equipment, net $ 115,825 $ 97,403  
Depreciation and amortization 4,333 5,531 $ 4,871
Service Life      
Property, plant and equipment [Abstract]      
Decrease in manufacturing costs as a result of lower depreciation $ 1,400    
Decrease in net loss per share, basic and diluted, as a result of lower depreciation $ 0.03    
Machinery and equipment      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross $ 48,206 45,742  
Less: accumulated depreciation and amortization (37,832) (37,115)  
Building      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 94,567 38,837  
Less: accumulated depreciation and amortization (15,324) (12,736)  
Leasehold improvements      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 6,285 4,877  
Less: accumulated depreciation and amortization (4,616) (4,035)  
Construction in progress      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 24,539 61,833  
Construction in progress Dingxin and Kazuo locations [Member]      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 14,200 48,800  
Construction in progress manufacturing equipment purchases      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 4,000 3,400  
Construction in progress other consolidated subsidiaries      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross $ 6,300 $ 9,600