Income tax (Tables)

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Schedule of loss before income taxes from US and Foreign sources

	2022			2021
United States		(25,424,002	)		(16,466,423	)
Outside United States		1,208,777			(1,198,341	)
Loss before income taxes		(24,215,225	)		(17,664,764	)

Schedule of U.S. federal statutory tax rate and the company’s effective tax rate

	2022			2021
US Federal statutory federal income tax		21.00	%		21.00	%
State taxes		-2.52	%		3.94	%
Other deferred adjustments		3.03	%		-2.02	%
Change in tax rates		0	%		-1.53	%
Change in valuation allowance		-21.5	%		-21.39	%
Total income tax provision		0	%		0	%

Schedule of deferred tax assets and liabilities

	2022			2021
Deferred tax assets
Net operating loss		14,997,873			12,702,731
Stock options		7,450,914			5,922,550
Federal tax credits		336,475			303,556
Basis difference in intangible and fixed assets		963,784			(206,925	)
Accrued payroll		11,203			169,242
Capital loss		350,526			-
Valuation allowance		(24,110,775	)		(18,891,154	)
Deferred tax assets, net		-			-