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Investments in Privately Held Companies (Details)
2 Months Ended 12 Months Ended
Nov. 02, 2017
USD ($)
Dec. 31, 2017
USD ($)
subsidiary
item
Dec. 31, 2017
USD ($)
subsidiary
item
Dec. 31, 2017
USD ($)
employee
subsidiary
entity
item
Dec. 31, 2016
USD ($)
entity
item
Dec. 31, 2015
USD ($)
item
Mar. 31, 2017
USD ($)
Summary of investments [Abstract]              
Direct investments | item       6      
Indirect investments | item       4      
Investments in privately-held companies   $ 5,578,000 $ 5,578,000 $ 5,578,000 $ 6,599,000    
Number of consolidated joint ventures | subsidiary   3 3 3      
Net loss attributable to noncontrolling interests       $ (87,000) (670,000) $ (305,000)  
Net Income Loss From Consolidated Joint Ventures And Equity Method Investees Attributable To Parent           1,100,000  
Net income       $ (900,000) $ (1,200,000) $ (43,000)  
Direct minority investments not consolidated | entity       3 3    
Impaired entities | entity       1      
Joint Ventures              
Summary of investments [Abstract]              
Number of consolidated joint ventures | item   3 3 3 3 3  
Income (loss) from consolidated joint ventures       $ 2,100,000 $ 100,000 $ 800,000  
Net loss attributable to noncontrolling interests       (100,000) (700,000) (300,000)  
Net income (loss) from joint ventures attributable to parent       2,200,000 800,000 $ 1,200,000  
Net Income Loss From Consolidated Joint Ventures And Equity Method Investees Attributable To Parent       1,300,000 (400,000)    
Other assets              
Summary of investments [Abstract]              
Investments in privately-held companies   $ 9,800,000 $ 9,800,000 9,800,000 11,300,000    
Other assets | Joint Ventures              
Summary of investments [Abstract]              
Value of indirectly owned minority investments in privately-held companies   4,300,000 4,300,000 4,300,000 4,700,000    
Beijing JiYa Semiconductor Material Co., Ltd Investment              
Summary of investments [Abstract]              
Investments, consolidated   3,331,000 3,331,000 $ 3,331,000 3,331,000    
Percentage of ownership, consolidated method (in hundredths)       46.00%      
Nanjing JinMei Gallium Co., Ltd Investment              
Summary of investments [Abstract]              
Investments, consolidated   592,000 592,000 $ 592,000 592,000    
Percentage of ownership, consolidated method (in hundredths)       83.00%      
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment              
Summary of investments [Abstract]              
Investments, consolidated   $ 1,346,000 $ 1,346,000 $ 1,346,000 1,346,000    
Percentage of ownership, consolidated method (in hundredths)   70.00% 63.00% 63.00%      
Investment gain $ 0            
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment              
Summary of investments [Abstract]              
Investments in privately-held companies   $ 1,473,000 $ 1,473,000 $ 1,473,000 1,498,000    
Percentage of ownership, equity method (in hundredths)   46.00% 46.00% 46.00%      
Xilingol Tongli Germanium Co. Ltd Investment              
Summary of investments [Abstract]              
Investments in privately-held companies   $ 3,190,000 $ 3,190,000 $ 3,190,000 4,000,000    
Percentage of ownership, equity method (in hundredths)   25.00% 25.00% 25.00%      
Emeishan Jia Mei High Purity Metals Co., Ltd Investment              
Summary of investments [Abstract]              
Investments in privately-held companies   $ 915,000 $ 915,000 $ 915,000 1,101,000    
Percentage of ownership, equity method (in hundredths)   25.00% 25.00% 25.00%      
One Gallium Company              
Summary of investments [Abstract]              
Investments in privately-held companies             $ 0
Beijing JiYa Semiconductor Material Co., Ltd              
Summary of investments [Abstract]              
Indirect investments | entity       3      
Number of new board representatives | employee       1      
Employee duration       27 years      
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd              
Summary of investments [Abstract]              
Number of new board representatives | employee       2      
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd | 3rd party investor              
Summary of investments [Abstract]              
Investments, consolidated $ 2,000,000            
Percentage of ownership, consolidated method (in hundredths) 10.00%            
Nanjing JinMei Gallium Co., Ltd              
Summary of investments [Abstract]              
Number of new board representatives | employee       2      
Majority-Owned Subsidiaries              
Summary of investments [Abstract]              
Investments, consolidated   $ 5,269,000 $ 5,269,000 $ 5,269,000 $ 5,269,000    
Jinmei              
Summary of investments [Abstract]              
Indirect investments | entity       1