Common stock (Details)		1 Months Ended	6 Months Ended
	Jan. 15, 2023 shares	Jan. 31, 2023 USD ($) shares	Jun. 30, 2023 USD ($) Vote shares
Common stock voting right | Vote			1
Proceeds from issuance of common stock | $			$ 34,000
2020 Plan | Non-employee
Shares issued | shares	55,250
Open Market Sale
Stock issued | shares		5,925	5,925
Proceeds from issuance of common stock | $		$ 34,000	$ 34,000