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Bank Loans and Line of Credit (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 12, 2019
Aug. 09, 2019
Dec. 31, 2020
Oct. 31, 2020
Sep. 30, 2020
Aug. 31, 2020
Feb. 29, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Feb. 05, 2020
Nov. 08, 2018
Nov. 06, 2018
Debt Instrument [Line Items]                          
Proceeds from lines of credit               $ 391          
Bank loan     $ 10,411             $ 10,376      
Lines OF Credit, Current                          
Debt Instrument [Line Items]                          
Letters of credit outstanding                   8,800      
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%                
Proceeds from credit facility $ 2,800 $ 2,800                      
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%             4.70%        
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                   3.92%      
Repayments of line of credit     400                    
Letters of credit outstanding     $ 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 $ 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