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Related Party Transactions (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 25, 2020
USD ($)
Nov. 02, 2017
USD ($)
Sep. 30, 2021
USD ($)
ft²
item
Mar. 31, 2020
USD ($)
May 31, 2019
USD ($)
Nov. 30, 2017
USD ($)
Jul. 31, 2017
USD ($)
installment
Apr. 30, 2016
USD ($)
Sep. 30, 2021
USD ($)
ft²
Sep. 30, 2020
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2021
USD ($)
ft²
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Related Party Transaction [Line Items]                            
Area of leased property (in square feet) | ft²     19,467           19,467     19,467    
Long term debt, related party     $ 929,000           $ 929,000     $ 929,000    
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment                            
Related Party Transaction [Line Items]                            
Additional Minority Ownership Percentage by Parent                           4
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent                           $ 1,600,000
Related party loan | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                            
Related Party Transaction [Line Items]                            
Revenue from related parties                 0     50,000 $ 300,000  
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     0           0     0   0
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     $ 110,000           $ 110,000     $ 110,000   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           22,081     22,081    
Lease term     10 years           10 years     10 years    
Annual lease payment                       $ 24,000    
Increase in annual lease payment at each third year anniversary (in hundredths)     5.00%           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]                            
Number of installments | installment             3              
Related party notes receivable - long term             $ 768,000              
Amount payable to related party     $ 0           $ 0     $ 0   303,000
Interest rate (as a percent)             4.90%              
Repayment of related party notes receivable                       858,000    
Executive officer | Related party loan | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                            
Related Party Transaction [Line Items]                            
Amount of transaction       $ 141,000 $ 146,000 $ 291,000   $ 177,000            
Interest rate (as a percent)       2.75% 2.75% 2.75%   2.75%            
Repayment of related party notes receivable $ 612,000                   $ 180,000      
Proceeds from Collection of Interest from Long Term Loans to Related Parties $ 35,000                          
Executive officer | Related party loan | Other assets | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                            
Related Party Transaction [Line Items]                            
Related party notes receivable - current     0           0     0   $ 0
3rd Party Investor | Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment                            
Related Party Transaction [Line Items]                            
Raised additional capital   $ 2,000,000                        
Percentage ownership from issuance of shares   10.00%                        
Additional Minority Ownership Percentage by Parent                           4
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent                           $ 1,600,000
Percentage of Equity Interests Sold                           6.00%
3rd Party Investor | Beijing BoYu Semiconductor Vessel Craftwork Technology Co                            
Related Party Transaction [Line Items]                            
Revenue from related parties                   $ 37,000        
Raised additional capital   $ 2,000,000                        
Percentage ownership from issuance of shares   10.00%                        
ChaoYang Xinshuo | Loan from related party | ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd                            
Related Party Transaction [Line Items]                            
Amount of transaction     $ 900,000                      
Interest rate (as a percent)     6.50%                      
Loan received from number of minority investors | item     1                      
Number of minority investors | item     2                      
Long term debt, related party     $ 900,000           $ 900,000     $ 900,000