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Commitments and contingencies (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Mar. 31, 2022
Oct. 25, 2019
Raw krill oil supply contract [Abstract]        
Shipping cost $ 0 $ 193    
Legal proceedings and disputes [Abstract]        
Reserves or Liabilities 0 0    
Raw Krill Oil Supply Contract [Member]        
Research and development contracts and contract research organizations agreements [Abstract]        
Purchase commitments     $ 2,800  
Raw krill oil supply contract [Abstract]        
Committed value of contract       $ 3,100
CMOs [Member]        
Research and development contracts and contract research organizations agreements [Abstract]        
Purchase commitments 398 398    
CROs [Member]        
Research and development contracts and contract research organizations agreements [Abstract]        
Purchase commitments $ 3,900 $ 3,900