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Related Party Transactions (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 02, 2017
USD ($)
Nov. 30, 2017
USD ($)
Jul. 31, 2017
USD ($)
installment
Apr. 30, 2016
USD ($)
Apr. 30, 2014
USD ($)
Aug. 31, 2011
USD ($)
item
Jun. 30, 2018
USD ($)
ft²
installment
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
ft²
installment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]                      
Area of leased property (in square feet) | ft²             19,467   19,467    
Repayment of related party notes receivable                   $ 53,000  
Minimum | Nanjing JinMei Gallium Co., Ltd                      
Related Party Transaction [Line Items]                      
Estimated land and construction costs     $ 2,000,000                
Maximum | Nanjing JinMei Gallium Co., Ltd                      
Related Party Transaction [Line Items]                      
Estimated land and construction costs     4,000,000                
Equity investment entity | Beijing JiYa Semiconductor Material Co., Ltd                      
Related Party Transaction [Line Items]                      
Ownership (as a percent)             10.00%   10.00%    
Revenue from related parties                 $ 0    
Equity investment entity | Related party loan | Beijing JiYa Semiconductor Material Co., Ltd                      
Related Party Transaction [Line Items]                      
Amount of transaction           $ 1,600,000          
Number of equity method investees to whom loan was granted | item           1          
Term of loan                 2 years 10 months    
Number of installments | installment             3   3    
Equity investment entity | Related party loan | Other assets | Beijing JiYa Semiconductor Material Co., Ltd                      
Related Party Transaction [Line Items]                      
Amounts due from related party, noncurrent             $ 1,100,000   $ 1,100,000   $ 1,200,000
Equity investment entity | Raw materials purchases from related party | Accounts payable | Beijing JiYa Semiconductor Material Co., Ltd                      
Related Party Transaction [Line Items]                      
Amount payable to related party             2,000,000   2,000,000   2,100,000
Equity investment entity | Raw materials sales to related party | Accounts receivable | Beijing JiYa Semiconductor Material Co., Ltd                      
Related Party Transaction [Line Items]                      
Amounts receivable from related party             328,000   328,000   $ 334,000
Equity investment entity | Raw material agency sales agreement | Other (expense) income, net | Nanjing JinMei Gallium Co., Ltd                      
Related Party Transaction [Line Items]                      
Other income from related party             1,000 $ 0 1,000 1,000  
Donghai County Dongfang High Purity Electronic Materials Co., Ltd | Related party loan | Beijing Tongmei Xtal Technology                      
Related Party Transaction [Line Items]                      
Amount of transaction         $ 46,000            
Interest rate (as a percent)                     6.15%
Repayment of related party notes receivable                     $ 55,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd | Raw materials purchases from related party | Beijing Tongmei Xtal Technology                      
Related Party Transaction [Line Items]                      
Repayment of related party notes receivable                     114,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd | Raw materials purchases from related party | Accounts payable | Beijing Tongmei Xtal Technology                      
Related Party Transaction [Line Items]                      
Amount payable to related party             295,000   295,000   0
Emei Shan Jiamei Materials Co., Ltd | Raw materials purchases from related party | Accounts payable | Beijing Tongmei Xtal Technology                      
Related Party Transaction [Line Items]                      
Amount payable to related party             123,000   123,000   370,000
Xilingol Tongli Germanium Co. Ltd | Raw materials purchases from related party | Accounts payable | Beijing Tongmei Xtal Technology                      
Related Party Transaction [Line Items]                      
Amount payable to related party             $ 238,000   $ 238,000   219,000
Beijing BoYu Semiconductor Vessel Craftwork Technology Co | Lease of land | Beijing Tongmei Xtal Technology                      
Related Party Transaction [Line Items]                      
Area of leased property (in square feet) | ft²             22,081   22,081    
Lease term                 10 years    
Annual lease payment                 $ 24,000    
Increase in annual lease payment at each third year anniversary (in hundredths)             5.00%   5.00%    
Rental increase period                 3 years    
Nanjing JinMei Gallium Co., Ltd | Related party loan | Beijing Tongmei Xtal Technology                      
Related Party Transaction [Line Items]                      
Amount of transaction     $ 768,000                
Number of installments | installment     3                
Interest rate (as a percent)     4.90%                
Executive officer | Related party loan | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                      
Related Party Transaction [Line Items]                      
Amount of transaction   $ 318,000   $ 177,000              
Interest rate (as a percent)   2.75%   2.75%              
Repayment of related party notes receivable               180,000      
Executive officer | Related party loan | Other assets | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                      
Related Party Transaction [Line Items]                      
Related party notes receivable - current             $ 308,000   $ 308,000   307,000
3rd party investor | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                      
Related Party Transaction [Line Items]                      
Raised additional capital $ 2,000,000                    
Percentage ownership from issuance of shares 10.00%                    
Customer associated with third-party investor | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                      
Related Party Transaction [Line Items]                      
Revenue from related parties             530,000 $ 51,000 1,300,000 $ 388,000  
Customer associated with third-party investor | Accounts receivable | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                      
Related Party Transaction [Line Items]                      
Amount payable to related party             $ 550,000   $ 550,000   $ 635,000