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Bank Loans and Line of Credit (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Sep. 12, 2019
Aug. 09, 2019
Apr. 30, 2021
Dec. 31, 2020
Oct. 31, 2020
Sep. 30, 2020
Aug. 31, 2020
Feb. 29, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2021
Feb. 05, 2020
Nov. 06, 2018
Debt Instrument [Line Items]                          
Proceeds from lines of credit                 $ 395        
Bank loan       $ 10,411             $ 10,533    
Lines OF Credit, Current                          
Debt Instrument [Line Items]                          
Bank loan                     9,000    
Bank Of China | Secured Debt | Beijing Tongmei Xtal Technology                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity   $ 5,800                      
Variable rate spread (as a percent)         4.70% 3.85%              
Repayments of line of credit     $ 5,600                    
Letters of credit outstanding                     5,800    
Proceeds from credit facility $ 2,800 $ 2,800                      
Combined loans renewed                     $ 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    
Combined loans renewed                     $ 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%    
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    
Wells Fargo Bank | Letter of Credit                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity                         $ 1,000
Letters of credit outstanding       0           0 0    
Combined loans renewed       $ 0           $ 0 $ 0