Prepaid expenses and Other current assets (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Prepaid expenses and Other current assets [Abstract]
VAT receivable	$ 826,973	$ 259,831
Grants receivable	597,155	95,064
Other current assets	520,007	140,126
Prepaid expenses	1,822,962	1,724
Total	$ 3,767,096	$ 496,745