Significant accounting policies - Summary of reconciliation of numerator and denominator of diluted net loss per share (Details) - USD ($)		3 Months Ended				9 Months Ended
	Jul. 06, 2022	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net (loss) income		$ (3,187,275)	$ (3,187,275)	$ (3,005,404)	$ (3,005,404)	$ (15,756,665)	$ (7,845,867)
Cumulative dividends on Series A preferred stock				(36,685)	(36,685)		(108,858)
Net loss attributable to common stockholders		$ (3,187,275)	$ (3,187,275)	$ (3,042,089)	$ (3,042,089)	$ (15,756,665)	$ (7,954,725)
Basic weighted average number of shares outstanding		2,095,091	2,095,091	733,194	733,194	1,550,326	717,476
Diluted weighted average number of shares outstanding		2,095,091	2,095,091	733,194	733,194	1,550,326	717,476
Basic net loss per share attributable to common stockholders		$ (1.52)	$ (1.52)	$ (4.15)	$ (4.15)	$ (10.16)	$ (11.09)
Diluted net loss per share attributable to common stockholders		$ (1.52)	$ (1.52)	$ (4.15)	$ (4.15)	$ (10.16)	$ (11.09)
Series A preferred stock (if converted)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Accrued dividend on preferred stock units	$ 0