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Bank Loans and Line of Credit (Details) - USD ($)
1 Months Ended
Dec. 26, 2018
Nov. 06, 2018
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]        
Repayment of principal amount $ 291,000      
Interest paid $ 3,000      
LIBOR        
Debt Instrument [Line Items]        
Variable rate spread (as a percent)   2.00%    
Letter of credit        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 1,000,000    
ICBC | Secured Debt        
Debt Instrument [Line Items]        
Maximum borrowing capacity     $ 2,900,000  
Annual interest rate at end     4.40%  
Outstanding     $ 291,000  
ICBC | Secured Debt | Prime Rate        
Debt Instrument [Line Items]        
Variable rate spread (as a percent)     0.04%  
Wells Fargo Bank        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 10,000,000    
Wells Fargo Bank | Secured Debt        
Debt Instrument [Line Items]        
Loans outstanding       $ 0
Letters of credit outstanding       $ 0