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Bank Loans and Line of Credit (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Sep. 12, 2019
Aug. 09, 2019
Nov. 06, 2018
Mar. 31, 2020
Feb. 29, 2020
Jun. 30, 2020
Feb. 05, 2020
Feb. 04, 2020
Dec. 31, 2019
Debt Instrument [Line Items]                  
Proceeds from lines of credit           $ 395      
Bank loan           6,087     $ 5,747
Bank Of China | Secured Debt | Lines OF Credit, Current                  
Debt Instrument [Line Items]                  
Letters of credit outstanding           $ 5,700      
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              
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           $ 400      
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          
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 $ 10,000  
Letters of credit outstanding           $ 0      
Wells Fargo Bank | Secured Debt | LIBOR                  
Debt Instrument [Line Items]                  
Variable rate spread (as a percent)     2.00%     2.50%      
Wells Fargo Bank | Letter of credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity     $ 1,000