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Bank Loans and Line of Credit (Details) - USD ($)
Nov. 06, 2018
Jun. 30, 2019
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  
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