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Bank Loans and Line of Credit (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 09, 2020
Sep. 12, 2019
Aug. 09, 2019
Nov. 06, 2018
Oct. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Feb. 29, 2020
Dec. 31, 2020
Dec. 31, 2019
Feb. 05, 2020
Debt Instrument [Line Items]                      
Proceeds from lines of credit                 $ 10,401 $ 5,814  
Bank loan                 10,411 $ 5,747  
Lines OF Credit, Current                      
Debt Instrument [Line Items]                      
Letters of credit outstanding                 8,900    
Bank Of China | Secured Debt | Beijing Tongmei Xtal Technology                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity     $ 5,800                
Annual interest rate at end                   4.70%  
Proceeds from credit facility   $ 2,800 $ 2,800                
Interest rate         4.70% 3.85%          
Combined loan totals         $ 5,600            
Renewal period         6 months 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%                
ICBC | Secured Debt | Lines OF Credit, Current                      
Debt Instrument [Line Items]                      
Letters of credit outstanding                 $ 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                 4.30%    
Proceeds from lines of credit             $ 400   $ 1,100    
ICBC | Secured Debt | Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment | Prime Rate                      
Debt Instrument [Line Items]                      
Variable rate spread (as a percent)               0.15%      
Wells Fargo Bank | Secured Debt                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity       $ 10,000             $ 7,000
Loans outstanding                   $ 0  
Letters of credit outstanding                 $ 0    
Wells Fargo Bank | Secured Debt | LIBOR                      
Debt Instrument [Line Items]                      
Variable rate spread (as a percent)       2.00%              
Wells Fargo Bank | Letter of Credit                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity       $ 1,000              
Letters of credit outstanding                   $ 0