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Property, Plant and Equipment, Net (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Property, plant and equipment [Abstract]      
Property, plant and equipment, net $ 108,295 $ 108,295 $ 97,403
Service Life      
Property, plant and equipment [Abstract]      
Decrease in manufacturing costs as a result of lower depreciation $ 300 $ 900  
Decrease in net loss per share, basic and diluted, as a result of lower depreciation $ 0.01 $ 0.03  
Machinery and equipment      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross $ 46,207 $ 46,207 45,742
Less: accumulated depreciation and amortization (37,876) (37,876) (37,115)
Building      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 39,870 39,870 38,837
Less: accumulated depreciation and amortization (14,070) (14,070) (12,736)
Leasehold improvements      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 5,903 5,903 4,877
Less: accumulated depreciation and amortization (4,404) (4,404) (4,035)
Construction in progress      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 72,665 72,665 61,833
Construction in progress Dingxin and Kazuo locations      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 57,800 57,800 48,800
Construction in progress manufacturing equipment purchases      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 4,200 4,200 3,400
Construction in progress other consolidated subsidiaries      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross $ 10,700 $ 10,700 $ 9,600