Stockholders' equity (Details)			3 Months Ended			9 Months Ended
	May 16, 2022 $ / shares shares	Nov. 12, 2020 USD ($)	Sep. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2022 shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2022 USD ($) Vote $ / shares shares	Sep. 30, 2021 USD ($) shares	Dec. 31, 2021 $ / shares shares
Common stock
Stock, shares authorized			440,000,000			440,000,000
Common stock, shares authorized			400,000,000			400,000,000		400,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.001			$ 0.001		$ 0.001
Preferred stock, shares authorized			40,000,000			40,000,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.001			$ 0.001
Commission payable as a percentage of gross proceeds from sale of common stock under ATM offering		3.00%
Proceeds from at-the-market sales of common stock, net | $						$ 584,447
Number of voting rights per common share | Vote						1
Stock based compensation expense | $			$ 38,236		$ 2,036,591	$ 16,923,911	$ 5,722,651
Shelf Registration Statement
Maximum amount to be issued under universal shelf registration statement | $		$ 350,000,000.0
Maximum amount to be issued under at-the-market offering program | $		$ 14,744,728
Common Stock
Common stock
Conversion of preferred stock into common stock (in shares)						28,210,330
Series A Preferred Stock
Common stock
Conversion of preferred stock into common stock (in shares)			2,821,033			2,821,033
Number of shares remained to be converted into common stock			128,597			128,597
Atrin Pharmaceuticals, Inc
Common stock
Preferred stock conversion ratio	10
Atrin Pharmaceuticals, Inc | Common Stock
Common stock
Common stock, par value (in dollars per share) | $ / shares	$ 0.001
Atrin Pharmaceuticals, Inc | Series A Preferred Stock
Common stock
Issuance of preferred stock upon acquisition of Atrin (in shares)	2,949,630			2,949,630
Preferred stock conversion ratio	10
ATM offering
Shelf Registration Statement
Issuance of common stock pursuant to at-the-market stock sales, net (in shares)			625,709		0	625,709	0
Proceeds from issuance of common shares | $			$ 600,000			$ 600,000