Stockholders' deficit - (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Class of Warrant or Right [Line Items]
Exercise price, Beginning balance	$0.000675 to $0.12	$0.00204 to $0.12
Weighted average exercise price Beginning balance	$ 0.011380	$ 0.0044700
Exercise price, Granted	0.0020500	0.0017357
Weighted average exercise price Granted	$ 0.003080	$ 0.0017357
Exercise Price Adjustment due to price protection		0.0000324
Weighted average exercise price Adjustment due to price protection		$ 0.0000324
Exercise price forfeited/cancelled	$0.0015 to 0.12	0.0300000
Weighted average exercise price Forfeited/cancelled	$ 0.039029	$ 0.0300000
Exercise price Granted in terms of debt extinguishment		0.000675
Weighted average exercise price Granted in terms of debt extinguishment		$ 0.0006750
Exercise price Cancelled as part of debt extinguishment		0.0000324
Weighted average exercise price Cancelled as part of debt extinguishment		$ 0.0000324
Exercise Price Exercised	$0.00150 to $0.00205	0.0004
Weighted average exercise price Exercised	$ 0.003291	$ 0.0004000
Exercise price ending balance	$0.000675 to $0.12
Weighted average exercise price Ending balance	$ 0.0052875	$ 0.011380
Warrants
Class of Warrant or Right [Line Items]
Beginning balance, warrants	615,561,379	2,566,101,248
Warrants Granted, shares	471,010,103	233,333,332
Warrant Adjustment due to price protection, shares		152,017,272,726
Warrants Forfeited/cancelled, shares	(101,682,866)	(2,366,666)
Granted in terms of debt extinguishment		326,286,847
Cancelled as part of debt extinguishment		(154,300,675,861)
Warrant Exercised, shares	(361,111,110)	(224,390,247)
Ending Balance, warrants	623,777,506	615,561,379