Annual report pursuant to Section 13 and 15(d)

Loss on extinguishment of convertible debt - Assumptions Black-scholes model (Details)

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Loss on extinguishment of convertible debt - Assumptions Black-scholes model (Details) - Warrants [Member]
12 Months Ended
Dec. 31, 2020
Risk free interest rate, minimum 0.16%
Risk free interest rate, maximum 0.19%
Expected life of options 2 to 3 years
Expected volatility of underlying stock, minimum 139.50%
Expected volatility of underlying stock, maximum 183.50%
Expected dividend rate 0.00%