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Revenue and related accounts - Narratives (Details)
3 Months Ended 12 Months Ended 15 Months Ended
Sep. 30, 2025
USD ($)
customer
Sep. 30, 2024
customer
Jun. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
customer
Product Information [Line Items]        
Allowance for credit losses | $ $ 122,000     $ 122,000
Number of customers | customer 2      
Prepaid expenses        
Prepaid expenses | $ $ 329,000   $ 887,000 329,000
Other assets        
Prepaid expenses        
Prepaid expenses | $ $ 813,000     $ 813,000
Customer concentration risk | Revenue        
Product Information [Line Items]        
Number of customers | customer 3 3   3
Customer concentration risk | Revenue | Customer one        
Product Information [Line Items]        
Concentration risk, percentage 32.00% 30.00%    
Customer concentration risk | Revenue | Customer two        
Product Information [Line Items]        
Concentration risk, percentage   14.00%    
Customer concentration risk | Revenue | Customer three        
Product Information [Line Items]        
Concentration risk, percentage 19.00% 13.00%    
Customer concentration risk | Revenue | Customer four        
Product Information [Line Items]        
Concentration risk, percentage 18.00%      
Credit Concentration Risk [Member] | Accounts receivable        
Product Information [Line Items]        
Number of customers | customer   3    
Credit Concentration Risk [Member] | Accounts receivable | Customer one        
Product Information [Line Items]        
Concentration risk, percentage 29.00%   26.00%  
Credit Concentration Risk [Member] | Accounts receivable | Customer two        
Product Information [Line Items]        
Concentration risk, percentage     15.00%  
Credit Concentration Risk [Member] | Accounts receivable | Customer three        
Product Information [Line Items]        
Concentration risk, percentage 18.00%   10.00%