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Note receivable (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Note receivable [Abstract]    
Interest rate 4.50%  
Royalty fee $ 100,000  
Note receivable, current 100,000 $ 1,017,000
Note receivable, net of current portion 1,584,000 $ 0
Allowance for loan losses 0  
Unamortized deferred loan fees and unearned discounts $ 0