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Note payable (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total note payable $ 686,000 $ 490,000
Note payable to related party 686,000 490,000
Note payable, excluding current portion 0 0
Working Capital Loan 1 [Member]    
Debt Instrument [Line Items]    
Total note payable 0 490,000
Working capital loan 2 [Member]    
Debt Instrument [Line Items]    
Total note payable $ 686,000 $ 0