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Stockholders' Equity (Deficit) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 09, 2024
director
Vote
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Class of Stock [Line Items]      
Common stock, authorized (in shares) 501,000,000 500,000,000 500,000,000
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001 $ 0.0001
Common stock, voting rights per share | Vote 1    
Exercised (in shares)   2,256,157  
Exercise of stock options | $   $ 1,044 $ 114
Preferred stock, issued (in shares)   0  
Preferred stock, outstanding (in shares)   0  
The 2024 Plan      
Class of Stock [Line Items]      
Reserved for future issuance (in shares)   15,872,516  
Earnout Shares      
Class of Stock [Line Items]      
Options vested during period (in shares)   433,348  
Preferred Stock      
Class of Stock [Line Items]      
Common stock, authorized (in shares) 1,000,000    
Common stock, par value (in dollars per share) | $ / shares $ 0.0001    
Common Class A      
Class of Stock [Line Items]      
Common stock, par value (in dollars per share) | $ / shares $ 0.0001    
Common stock, conversion ratio (in shares) 1    
Common stock, number of directors | director 7    
Reserved for future issuance (in shares) 10,432,749    
Exercised (in shares)   2,256,157 397,376
Exercise of stock options | $   $ 1,044 $ 114
Released from vesting restrictions (in shares)   12,500,000  
Common Class A | Legacy Oklo 2016 Plan      
Class of Stock [Line Items]      
Reserved for future issuance (in shares) 9,470,382    
Common Class A | The 2024 Plan      
Class of Stock [Line Items]      
Reserved for future issuance (in shares) 15,872,516    
Common Class A | Employee Stock      
Class of Stock [Line Items]      
Reserved for future issuance (in shares) 2,441,926    
Common Class A | Common Stock      
Class of Stock [Line Items]      
Common stock, authorized (in shares) 500,000,000    
Exercised (in shares)   2,256,157 397,376
Shares issued during period (in shares)   14,699,794