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Convertible debt - Related Parties (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 14, 2016
Nov. 18, 2009
Feb. 28, 2018
Aug. 07, 2017
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Short-term Debt [Line Items]                
Convertible debt   $ 600,000       $ 1,350,000  
Interest payable   15.00%            
Periodic payment of interest   $ 7,500            
Conversion price   $ 0.70            
Share price per share             $ 0.40  
Loan maturity date             May 31, 2019  
Interest expense         129 $ 9,770    
Minimum [Member]                
Short-term Debt [Line Items]                
Interest payable     10.00%          
Maximum [Member]                
Short-term Debt [Line Items]                
Interest payable     15.00%          
Convertible Debt [Member]                
Short-term Debt [Line Items]                
Convertible debt $ 250,000     $ 500,000       $ 428,000
Interest payable 10.00%              
Conversion price $ 0.25              
Accrued interest payable           $ 456,750  
Common stock and principal and interest were initially due date Sep. 30, 2018              
Loan maturity date     May 31, 2019          
Convertible debt, description       The remaining $72,000 was advanced in 2018 with the final advance on February 9, 2018.        
Interest expense         $ 24,412 $ 37,602