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Investments in Privately-Held Companies (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 15, 2018
USD ($)
installment
Nov. 02, 2017
USD ($)
Sep. 30, 2018
USD ($)
employee
subsidiary
entity
Sep. 30, 2018
USD ($)
employee
subsidiary
entity
Sep. 30, 2017
USD ($)
subsidiary
entity
company
Sep. 30, 2018
USD ($)
employee
subsidiary
entity
item
Sep. 30, 2017
USD ($)
subsidiary
entity
company
Dec. 31, 2017
USD ($)
entity
Aug. 31, 2018
Jun. 14, 2018
Nov. 01, 2017
Mar. 31, 2017
USD ($)
Summary of investments [Abstract]                        
Direct investments | item           6            
Indirect investments | item           4            
Investments, equity method     $ 5,131,000 $ 5,131,000   $ 5,131,000   $ 5,578,000        
Payment of first installment           415,000            
Remainder portion of payment     $ 1,192,000 $ 1,192,000   $ 1,192,000            
Number of consolidated joint ventures | subsidiary     1 1 1 1 1          
Net income (loss) attributable to noncontrolling interests       $ 208,000 $ 146,000 $ 1,173,000 $ (226,000)          
Direct minority investments not consolidated | entity           3   3        
Impairment charge       $ 0 $ 0 $ 0            
Joint Ventures                        
Summary of investments [Abstract]                        
Indirect investments | entity           4            
Number of consolidated joint ventures | entity     3 3 3 3 3          
Income (loss) from consolidated joint ventures       $ 1,300,000 $ 860,000 $ 4,800,000 $ 1,100,000          
Net income (loss) attributable to noncontrolling interests       208,000 146,000 1,200,000 (200,000)          
Net income (loss) from joint ventures attributable to parent       1,100,000 $ 714,000 3,700,000 1,300,000          
Other assets                        
Summary of investments [Abstract]                        
Investments, equity method     $ 9,500,000 9,500,000   9,500,000   $ 9,800,000        
Other assets | Joint Ventures                        
Summary of investments [Abstract]                        
Minority investment in consolidated joint venture, included in other assets     4,400,000 4,400,000   4,400,000   4,300,000        
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment                        
Summary of investments [Abstract]                        
Investments, equity method     $ 1,450,000 $ 1,450,000   $ 1,450,000   1,473,000        
Percentage of ownership, equity method (in hundredths)     46.00% 46.00%   46.00%            
Xilingol Tongli Germanium Co. Ltd Investment                        
Summary of investments [Abstract]                        
Investments, equity method     $ 2,811,000 $ 2,811,000   $ 2,811,000   3,190,000        
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, equity method     $ 870,000 $ 870,000   $ 870,000   915,000        
Percentage of ownership, equity method (in hundredths)     25.00% 25.00%   25.00%            
One Gallium Company                        
Summary of investments [Abstract]                        
Investments, equity method                       $ 0
Impairment charge             $ 313,000          
Number of gallium companies with impairment charge | company         1   1          
Beijing JiYa Semiconductor Material Co., Ltd                        
Summary of investments [Abstract]                        
Indirect investments | entity           3            
Number of persons on board | employee     1 1   1            
Employee duration           27 years            
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd                        
Summary of investments [Abstract]                        
Number of persons on board | employee     2 2   2            
Nanjing JinMei Gallium Co., Ltd                        
Summary of investments [Abstract]                        
Number of new board representatives | employee           2            
Jinmei                        
Summary of investments [Abstract]                        
Indirect investments | entity           1            
Majority-Owned Subsidiaries                        
Summary of investments [Abstract]                        
Investments, consolidated method     $ 5,269,000 $ 5,269,000   $ 5,269,000   5,269,000        
Beijing JiYa Semiconductor Material Co., Ltd Investment                        
Summary of investments [Abstract]                        
Investments, consolidated method     $ 3,331,000 $ 3,331,000   $ 3,331,000   3,331,000        
Beijing JiYa Semiconductor Material Co., Ltd Investment | Beijing JiYa Semiconductor Material Co., Ltd Investment                        
Summary of investments [Abstract]                        
Percentage of ownership, consolidated method (in hundredths)     46.00% 46.00%   46.00%            
Nanjing JinMei Gallium Co., Ltd Investment                        
Summary of investments [Abstract]                        
Investments, consolidated method     $ 592,000 $ 592,000   $ 592,000   592,000        
Additional percentage of ownership, consolidated method 12   2 2   2            
Purchase of subsidiary shares from noncontrolling interest $ 1,400,000   $ 252,000                  
Number of installments | installment 2                      
Payment of first installment $ 163,000                      
Nanjing JinMei Gallium Co., Ltd Investment | Accrued Liabilities [Member]                        
Summary of investments [Abstract]                        
Remainder portion of payment     $ 1,200,000 $ 1,200,000   $ 1,200,000            
Nanjing JinMei Gallium Co., Ltd Investment | Nanjing JinMei Gallium Co., Ltd Investment                        
Summary of investments [Abstract]                        
Percentage of ownership, consolidated method (in hundredths)     97.00% 97.00%   97.00%     95.00% 83.00%    
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment                        
Summary of investments [Abstract]                        
Investments, consolidated method     $ 1,346,000 $ 1,346,000   $ 1,346,000   $ 1,346,000        
Gain (loss) from equity transaction   $ 0                    
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment | 3rd party investor                        
Summary of investments [Abstract]                        
Percentage ownership from issuance of shares   10.00%                    
Raised additional capital   $ 2,000,000                    
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment | Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment                        
Summary of investments [Abstract]                        
Percentage of ownership, consolidated method (in hundredths)     63.00% 63.00%   63.00%         70.00%