Stockholder's equity (deficit) - Warrants Associated with Loan Agreement (Details) - USD ($)			3 Months Ended	12 Months Ended
	Feb. 28, 2024	Jun. 15, 2022	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Mar. 10, 2023
Class of Stock [Line Items]
Proceeds from term loan				$ 15,000,000	$ 10,000,000
Loan Agreement
Class of Stock [Line Items]
Issued warrants to purchase shares of common stock				36,718
Hercules Capital Inc and Hercules Private Global Venture Growth Fund I L.P.
Class of Stock [Line Items]
Maximum percentage of warrants purchased				1.50%
Issued warrants to purchase shares of common stock		36,718	9,180
Hercules
Class of Stock [Line Items]
Issued warrants to purchase shares of common stock						9,180
Hercules | Loan Agreement
Class of Stock [Line Items]
Proceeds from term loan			$ 15,000,000
Hercules | Loan Agreement | Term Loan
Class of Stock [Line Items]
Maximum borrowing capacity		$ 100,000,000
Proceeds from term loan		$ 10,000,000
Hercules | Loan Agreement | Term Loan | Subsequent Event
Class of Stock [Line Items]
Issued warrants to purchase shares of common stock	18,359
Maximum borrowing capacity	$ 150,000,000
Proceeds from term loan	$ 10,000,000