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Stock-based compensation - Stock Options Activity (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Shares  
Options outstanding, beginning balance (in shares) | shares 1,249,680
Granted (in shares) | shares 59,575
Forfeited (in shares) | shares (9,450)
Expired (in shares) | shares (147,184)
Options outstanding, ending balance (in shares) | shares 1,152,621
Options exercisable (in shares) | shares 448,178
Weighted-average exercise price per share  
Options outstanding, beginning balance (in dollars per share) | $ / shares $ 8.48
Granted (in dollars per share) | $ / shares 8.01
Forfeited (in dollars per share) | $ / shares 7.15
Expired (in dollars per share) | $ / shares 10.42
Options outstanding, ending balance (in dollars per share) | $ / shares 8.22
Options exercisable (in dollars per share) | $ / shares $ 10.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average remaining contractual term, options outstanding 5 years
Weighted average remaining contractual term, options exercisable 2 years 9 months 18 days
Aggregate intrinsic value, options outstanding | $ $ 465
Aggregate intrinsic value, options exercisable | $ $ 15