Stock compensation and other employee benefit plans - Summary of Information Related to Outstanding Options (Parenthetical) (Details) - $ / shares		12 Months Ended
		Dec. 31, 2023	Apr. 30, 2023	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted, Shares made to CEO		450,000
Exercise Price		$ 8.14
Outstanding Options, Modified		2,415,526		6,809,850
Cancellation of Options		1,053,750
Modified, Shares	[1]	1,053,750
Reduced Exercise Price per Option		$ 2.48
Chief Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Outstanding Options, Modified			2,107,500

[1] In April 2023, we modified a grant of 2,107,500 options initially made to our former Chief Executive Officer in September 2021. The options originally granted vested after a period of time once our stock price reached certain targets and had an exercise price of $8.14 per option. The modification in April 2023 resulted in cancellation of 1,053,750 options, reset the stock price targets for vesting and reduced the exercise price to $2.48 per option, based on the estimated fair value of our stock as of the modification date. As a result of the departure of our former Chief Executive Officer during the fourth quarter of 2023, the remaining options, all of which were unvested, were forfeited.