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Related Party Transactions (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 25, 2020
USD ($)
Nov. 02, 2017
USD ($)
Mar. 31, 2020
USD ($)
May 31, 2019
USD ($)
Nov. 30, 2017
USD ($)
Jul. 31, 2017
USD ($)
installment
Apr. 30, 2016
USD ($)
Mar. 31, 2021
USD ($)
ft²
Mar. 31, 2020
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2020
USD ($)
Related Party Transaction [Line Items]                      
Area of leased property (in square feet) | ft²               19,467      
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               $ 5,000      
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               5,000     0
Equity investment entity | Raw material agency sales agreement | Other income (expense), net [Member] | Nanjing JinMei Gallium Co., Ltd                      
Related Party Transaction [Line Items]                      
Other income from related party               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               108,000     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               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      
Increase in annual lease payment at each third year anniversary (in hundredths)               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               $ 306,000     303,000
Interest rate (as a percent)           4.90%          
Repayment of related party notes receivable               535,000      
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
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                 $ 254,000    
Raised additional capital   $ 2,000,000                  
Percentage ownership from issuance of shares   10.00%