v3.26.3
Significant Accounting Policies (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
segment
Sep. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Product Information [Line Items]          
Number of operating segments | segment     1    
Number of reportable segments | segment     1    
Revenues $ 234,000 $ 0 $ 424,000 $ 0  
Grant liability, current 400,000   400,000    
Accounts receivable, allowance for credit loss, current 0   0    
Accounts receivable, write-offs 0   0    
Inventory for long-term contracts or programs, research and development expense, included in inventory     900,000    
Inventory 900,000   900,000    
Balance Sheet Location [Axis]: us-gaap:PrepaidExpenseAndOtherAssetsCurrent          
Product Information [Line Items]          
Accounts receivable, after allowance for credit loss, current (less than) 100,000   100,000    
Balance Sheet Location [Axis]: naut:AccruedLiabilitiesAndOtherLiabilitiesCurrent          
Product Information [Line Items]          
Grant liability, current 800,000   800,000    
Balance Sheet Location [Axis]: naut:AccruedLiabilitiesAndOtherLiabilitiesCurrent | First Payment          
Product Information [Line Items]          
Grant liability, current         $ 400,000
Balance Sheet Location [Axis]: naut:AccruedLiabilitiesAndOtherLiabilitiesCurrent | Second Payment          
Product Information [Line Items]          
Grant liability, current 400,000   400,000    
Grant revenue          
Product Information [Line Items]          
Revenues $ 208,000 $ 0 $ 388,000 $ 0