Equity - Common stock (Details)	Mar. 08, 2022 $ / shares shares	Sep. 30, 2023 $ / shares shares	Dec. 31, 2022 $ / shares shares
Equity
Reverse stock split	0.25
Common stocks, shares outstanding	17,500,000	21,291,924	20,277,046
Common stocks, shares issued	17,500,000	21,291,924	20,277,046
Common stocks, shares authorized	450,000,000	450,000,000	450,000,000
Common stocks, par value (in dollars per share) | $ / shares	$ 0.0004	$ 0.0004	$ 0.0004