Fair value measurement (Details - ILIAD and Streeterville Capital) - Derivative Liability [Member] - Streeterville Convertible Bond [Member]	12 Months Ended
	Dec. 31, 2022
Measurement Input, Expected Term [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Range of rates	0.87-1.04
Measurement Input, Risk Free Interest Rate [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Range of rates	4.44%-4.63%
Measurement Input, Price Volatility [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Range of rates	86.2%-87.3%
Measurement Input, Expected Dividend Rate [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Range of rates	0