Stock-based compensation - Summary of stock option activity - other information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
2020 Stock Option and Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value of options granted (in dollars per share)	$ 2.33	$ 5.59
Intrinsic value of options exercised (in thousands)	$ 62	$ 407
Inducement Grants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value of options granted (in dollars per share)	$ 0	$ 4.94