Common stock and common stock warrants (Tables)

6 Months Ended

Jun. 30, 2022

Common stock and common stock warrant

Preferred stock warrants

Schedule of warrants to purchase the following classes of preferred stock outstanding

	June 30, 2022
			Shares of
			common stock
		Balance sheet	issuable upon	Weighted average
Issuance date	Contractual term	classification	exercise of warrant	exercise price
	(in years)
July 24, 2017	10	Equity	17,194	$	292.81
April 12, 2018	10	Equity	30,000	$	1.00
July 14, 2021	10	Equity	975,109	$	1.46
			1,022,303

As of December 31, 2021, outstanding warrants to purchase common stock outstanding consisted of the following:

	December 31, 2021
			Shares of
			common stock
		Balance sheet	issuable upon	Weighted average
Issuance date	Contractual term	classification	exercise of warrant	exercise price
	(in years)
July 24, 2017	10	Equity	25,835	$	295.15
April 12, 2018	10	Equity	30,000	$	1.00
July 14, 2021	10	Equity	975,109	$	1.46
			1,030,944