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Bank Loans and Line of Credit (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Sep. 12, 2019
Aug. 09, 2019
Sep. 30, 2021
Apr. 30, 2021
Dec. 31, 2020
Oct. 31, 2020
Sep. 30, 2020
Aug. 31, 2020
Feb. 29, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Jun. 30, 2021
Feb. 05, 2020
Nov. 06, 2018
Debt Instrument [Line Items]                              
Proceeds from lines of credit                   $ 5,845 $ 3,380        
Bank loan     $ 13,285   $ 10,411         13,285          
Lines OF Credit, Current                              
Debt Instrument [Line Items]                              
Bank loan     8,600             8,600          
Beijing Tongmei Xtal Technology                              
Debt Instrument [Line Items]                              
Bank loan     $ 3,100             $ 3,100          
Interest rate     4.00%             4.00%          
Bank Of China | Secured Debt | Beijing Tongmei Xtal Technology                              
Debt Instrument [Line Items]                              
Maximum borrowing capacity   $ 5,800         $ 3,100       $ 3,100        
Variable rate spread (as a percent)           4.70% 3.85%                
Repayments of line of credit     $ 3,100 $ 5,600                      
Letters of credit outstanding     2,700             $ 2,700     $ 5,800    
Proceeds from credit facility $ 2,800 $ 2,800                          
Combined loans renewed     2,700             2,700     $ 5,800    
Interest rate                         4.70%    
Combined loan totals           $ 5,600                  
Renewal period             6 months                
Additional loan borrowed           $ 2,700                  
Repayments of loan               $ 5,900              
Bank Of China | Secured Debt | Beijing Tongmei Xtal Technology | Prime Rate                              
Debt Instrument [Line Items]                              
Variable rate spread (as a percent)   0.40%                   4.70%      
ICBC | Secured Debt | Lines OF Credit, Current                              
Debt Instrument [Line Items]                              
Letters of credit outstanding     1,500             1,500          
Combined loans renewed     $ 1,500             $ 1,500          
ICBC | Secured Debt | Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment                              
Debt Instrument [Line Items]                              
Maximum borrowing capacity                 $ 1,400            
Annual interest rate at end     3.92%             3.92%          
Repayments of line of credit         400                    
Letters of credit outstanding         1,500                    
Combined loans renewed         $ 1,500                    
ICBC | Secured Debt | Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment | Prime Rate                              
Debt Instrument [Line Items]                              
Variable rate spread (as a percent)         0.07%       0.15%            
ICBC | Letter of Credit | Beijing Tongmei Xtal Technology                              
Debt Instrument [Line Items]                              
Proceeds from lines of credit         $ 1,500                    
Wells Fargo Bank | Secured Debt                              
Debt Instrument [Line Items]                              
Maximum borrowing capacity                           $ 7,000 $ 10,000
Loans outstanding     $ 0   0         $ 0   $ 0      
Wells Fargo Bank | Secured Debt | Beijing Tongmei Xtal Technology                              
Debt Instrument [Line Items]                              
Interest rate     3.85%             3.85%          
Wells Fargo Bank | Letter of Credit                              
Debt Instrument [Line Items]                              
Maximum borrowing capacity                             $ 1,000
Letters of credit outstanding     $ 0   0         $ 0   0      
Combined loans renewed     $ 0   $ 0         $ 0   $ 0