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Schedule of effective income tax rate (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Federal statutory tax rate 21.00% 21.00%
Change in valuation allowance 35.00% 39.00%
State taxes, net of federal benefit 1.00%  
Expiration of stock option 2.00% 1.00%
Intangible amortization  
Change in UTP 9.00%  
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent 1.00% 3.00%
Other Deferred Adjustments 2.00% 1.00%
Tax rate 1.00% 21.00%