Quarterly report pursuant to Section 13 or 15(d)

Fair value of financial instruments - Assumptions used to measure the fair value (Details)

v3.19.3
Fair value of financial instruments - Assumptions used to measure the fair value (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Fair Market Value of Common Stock $ 0.16
Issuance Date  
Fair Market Value of Common Stock $ 0.3275
Risk Free Interest Rate  
Derivative Asset, Measurement Input 2.41
Risk Free Interest Rate | Issuance Date  
Derivative Asset, Measurement Input 2.47
Risk Free Interest Rate | Issuance Date | Minimum [Member]  
Derivative Asset, Measurement Input 2.41
Risk Free Interest Rate | Issuance Date | Maximum [Member]  
Derivative Asset, Measurement Input 2.47
Measurement Input, Conversion Price  
Derivative Asset, Measurement Input 90
Measurement Input, Conversion Price | Issuance Date | Minimum [Member]  
Derivative Asset, Measurement Input | $ 50
Measurement Input, Conversion Price | Issuance Date | Maximum [Member]  
Derivative Asset, Measurement Input 90
Measurement Input, Expected Dividend Rate  
Derivative Asset, Measurement Input 0
Measurement Input, Expected Dividend Rate | Issuance Date  
Derivative Asset, Measurement Input 0
Measurement Input, Option Volatility  
Derivative Asset, Measurement Input 91.95
Measurement Input, Option Volatility | Issuance Date  
Derivative Asset, Measurement Input 91.95
Measurement Input, Expected Term  
Term 1 month 2 days
Measurement Input, Expected Term | Issuance Date  
Term 5 years
Measurement Input, Expected Term | Issuance Date | Minimum [Member]  
Term 1 month 2 days
Measurement Input, Expected Term | Issuance Date | Maximum [Member]  
Term 7 months 2 days