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Related Party Transactions (Details)
1 Months Ended 12 Months Ended
Nov. 02, 2017
USD ($)
May 31, 2019
USD ($)
Nov. 30, 2017
USD ($)
Jul. 31, 2017
USD ($)
installment
Jun. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2014
USD ($)
Dec. 31, 2019
USD ($)
ft²
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 11, 2019
May 10, 2019
Mar. 11, 2019
Mar. 10, 2019
Related Party Transaction [Line Items]                            
Proceeds from sale of previously consolidated subsidiary shares               $ 366,000            
Area of leased property (in square feet) | ft²               19,467            
Repayment of related party notes receivable                   $ 169,000        
Beijing JiYa Semiconductor Material Co., Ltd Investment                            
Related Party Transaction [Line Items]                            
Percentage of ownership, consolidated method (in hundredths)                     39.00% 46.00% 39.00% 46.00%
Beijing JiYa Semiconductor Material Co., Ltd                            
Related Party Transaction [Line Items]                            
Ownership (as a percent)               39.00%            
Equity investment entity | Raw materials sales to related party | Accounts receivable | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                            
Related Party Transaction [Line Items]                            
Amounts receivable from related party               $ 12,000 $ 0          
Equity investment entity | Raw material agency sales agreement | Other income (expense), net | Nanjing JinMei Gallium Co., Ltd                            
Related Party Transaction [Line Items]                            
Other income from related party               0 24,000          
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               0 59,000          
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               0 0          
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               $ 0 0          
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            
Lease term               10 years            
Annual lease payment               $ 24,000            
Rental increase period               3 years            
Interest rate (as a percent)               5.00%            
Nanjing JinMei Gallium Co., Ltd | Related party loan | Beijing Tongmei Xtal Technology                            
Related Party Transaction [Line Items]                            
Number of installments | installment       3                    
Related party notes receivable - long term       $ 768,000                    
Amount payable to related party               $ 285,000 316,000          
Interest rate (as a percent)       4.90%                    
Repayment of related party notes receivable               490,000            
Executive officer | Related party loan | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                            
Related Party Transaction [Line Items]                            
Amount of transaction   $ 146,000 $ 291,000     $ 177,000                
Interest rate (as a percent)   2.75% 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               449,000            
Executive officer | Related party loan | Prepaid expenses and other current assets | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                            
Related Party Transaction [Line Items]                            
Related party notes receivable - current                 299,000          
3rd party investor | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                            
Related Party Transaction [Line Items]                            
Revenue from related parties               $ 200,000 $ 1,500,000          
Raised additional capital $ 2,000,000                          
Percentage ownership from issuance of shares 10.00%