Stock-based compensation - Schedule of Share-Based Payment Arrangement, Option, Exercise Price Range (Details)	12 Months Ended
	Dec. 31, 2025 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares outstanding (in shares) | shares	117,000
Weighted Average Remaining Contractual Life (in years)	5 months 8 days
Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 2.22
$1.00 - 1.50
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares outstanding (in shares) | shares	2,000
Weighted Average Remaining Contractual Life (in years)	10 months 6 days
Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 1.49
$1.51 - 2.00
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares outstanding (in shares) | shares	105,000
Weighted Average Remaining Contractual Life (in years)	3 months 18 days
Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 1.90
$2.51 - 8.60
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares outstanding (in shares) | shares	10,000
Weighted Average Remaining Contractual Life (in years)	1 year 11 months 1 day
Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 5.69