Significant accounting policies (Details)	3 Months Ended
	Mar. 31, 2026 subsidiary shares	Mar. 31, 2025 shares
Accounting Policies [Abstract]
Number of wholly-owed subsidiaries | subsidiary	1
Basic (in shares)	193,768,641	190,707,085
Anti-dilutive common shares excluded from calculation of loss per common share (in shares)	1,445,426
Diluted (in shares)	195,214,067	190,707,085
Anti-dilutive common shares excluded from calculation of loss per common share (in shares)	10,367,441	15,572,411