Share-based compensation - Restricted Share Units - Summary (Details) - Restricted Stock Units (RSUs) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Outstanding Number (in shares)	579,440	256,736	296,474
Awards Issued January 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value per share (in dollars per share)	$ 3.90
Outstanding Number (in shares)	61,250
Average Remaining Amortization Period (Years)	29 days
Awards Issued April 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value per share (in dollars per share)	$ 2.52
Outstanding Number (in shares)	972
Average Remaining Amortization Period (Years)	3 months
Awards Issued March 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value per share (in dollars per share)	$ 2.08
Outstanding Number (in shares)	96,635
Average Remaining Amortization Period (Years)	1 year 3 months
Awards Issued March 2023 - Grant 2
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value per share (in dollars per share)	$ 2.08
Outstanding Number (in shares)	7,229
Average Remaining Amortization Period (Years)	1 year 3 months
Awards Issued March 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value per share (in dollars per share)	$ 1.50
Outstanding Number (in shares)	413,354
Average Remaining Amortization Period (Years)	2 years 3 months