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Business Combination - Earnout Awards (Details)
 8 Months Ended 12 Months Ended
May 09, 2024
tranche
D
$ / shares
shares
May 08, 2024
shares
Dec. 31, 2024
USD ($)
D
shares
Dec. 31, 2024
USD ($)
D
Dec. 31, 2023
USD ($)
Reverse Recapitalization [Line Items]          
Recapitalization, equity subjected 10.00%        
Recapitalization vesting period 5 years        
Contingent consideration, (in shares) | shares 15,000,000 78,996,459      
Stock price threshold (in dollars per share) | $ / shares $ 10        
Trading day threshold 20        
Trading day period 60        
Stock-based compensation | $       $ 12,484,000 $ 777,000
Reverse recapitalization, shares forfeited, consideration issued | $     $ 0    
Reverse recapitalization, shares forfeited, shares issued | shares     0    
Recapitalization exchange ratio 6.062        
Common Class A          
Reverse Recapitalization [Line Items]          
Reserved for future issuance (in shares) | shares 10,432,749        
Common Class A | Employee Stock Option          
Reverse Recapitalization [Line Items]          
Reserved for future issuance (in shares) | shares 10,432,749        
Earnout Shares          
Reverse Recapitalization [Line Items]          
Vesting tranches | tranche 3        
Earnout shares fair value | $     $ 261,716,000 261,716,000  
Stock-based compensation | $       7,784,000  
Earnout Shares | Common Class A          
Reverse Recapitalization [Line Items]          
Reverse recapitalization, number of shares forfeited during period (in shares) | shares     300,000    
Founder Shares          
Reverse Recapitalization [Line Items]          
Recapitalization vesting period 5 years        
Contingent consideration, (in shares) | shares 1,450,000        
Vesting tranches | tranche 4        
Vesting per triggering event (in shares) | shares 12,500,000        
Earnout shares fair value | $     $ 226,219,000 $ 226,219,000  
Earnout Shares and Founder Shares | Common Class A          
Reverse Recapitalization [Line Items]          
Trading day threshold     20 20  
Trading day period     60 60  
Reverse Recapitalization Earnout Triggering Event One | Earnout Shares          
Reverse Recapitalization [Line Items]          
Contingent consideration, (in shares) | shares 7,500,000        
Stock price threshold (in dollars per share) | $ / shares $ 12        
Trading day threshold 20        
Trading day period 60        
Reverse Recapitalization Earnout Triggering Event One | Founder Shares          
Reverse Recapitalization [Line Items]          
Contingent consideration, (in shares) | shares 6,250,000        
Stock price threshold (in dollars per share) | $ / shares $ 10        
Trading day threshold 20        
Trading day period 60        
Reverse Recapitalization Earnout Triggering Event Two | Earnout Shares          
Reverse Recapitalization [Line Items]          
Contingent consideration, (in shares) | shares 5,000,000        
Stock price threshold (in dollars per share) | $ / shares $ 14        
Trading day threshold 20        
Trading day period 60        
Reverse Recapitalization Earnout Triggering Event Two | Founder Shares          
Reverse Recapitalization [Line Items]          
Contingent consideration, (in shares) | shares 3,125,000        
Stock price threshold (in dollars per share) | $ / shares $ 12        
Trading day threshold 20        
Trading day period 60        
Reverse Recapitalization Earnout Triggering Event Three | Earnout Shares          
Reverse Recapitalization [Line Items]          
Contingent consideration, (in shares) | shares 2,500,000        
Stock price threshold (in dollars per share) | $ / shares $ 16        
Trading day threshold 20        
Trading day period 60        
Reverse Recapitalization Earnout Triggering Event Three | Founder Shares          
Reverse Recapitalization [Line Items]          
Contingent consideration, (in shares) | shares 1,562,500        
Stock price threshold (in dollars per share) | $ / shares $ 14        
Trading day threshold 20        
Trading day period 60        
Reverse Recapitalization Earnout Triggering Event Four | Founder Shares          
Reverse Recapitalization [Line Items]          
Contingent consideration, (in shares) | shares 1,562,500        
Stock price threshold (in dollars per share) | $ / shares $ 16        
Trading day threshold 20        
Trading day period 60        
Reverse Recapitalization, Earnout Triggering Events met between November 12, 2024 and November 13, 2024 | Earnout Shares | Common Class A          
Reverse Recapitalization [Line Items]          
Reveres recapitalization, shares issued (in shares) | shares     14,266,446    
Reverse Recapitalization, Earnout Shares Attributable to Legacy Oklo Vested Options | Earnout Shares | Common Class A          
Reverse Recapitalization [Line Items]          
Reveres recapitalization, shares issued (in shares) | shares     433,348    
Reverse Recapitalization, Earnout Shares Attributable to Legacy Oklo Vested Options | Founder Shares | Common Class A          
Reverse Recapitalization [Line Items]          
Reveres recapitalization, shares issued (in shares) | shares     12,500,000