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Bank Loans and Line of Credit (Details) - USD ($)
Sep. 12, 2019
Aug. 09, 2019
Nov. 06, 2018
Sep. 30, 2019
Debt Instrument [Line Items]        
Bank loan       $ 5,609,000
LIBOR        
Debt Instrument [Line Items]        
Variable rate spread (as a percent)     2.00%  
Secured Debt        
Debt Instrument [Line Items]        
Proceeds from credit facility $ 2,800,000 $ 2,800,000    
Letter of credit        
Debt Instrument [Line Items]        
Maximum borrowing capacity     $ 1,000,000  
Bank of China | Secured Debt        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 5,800,000    
Annual interest rate at end       4.70%
Bank of China | Secured Debt | Prime Rate        
Debt Instrument [Line Items]        
Variable rate spread (as a percent)   0.40%    
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