Revenue from contracts with customers (Schedule of Revenues by Geography) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 4,306,031	$ 4,214,441
Domestic [Member]
Disaggregation of Revenue [Line Items]
Total revenue	1,203,748	1,917,367
International [Member]
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,102,283	$ 2,297,074