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Stock-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
May 09, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Options, outstanding (in shares) 9,470,382 11,426,653  
Stock option awards not vested (in shares) 6,213,769    
Common Class A      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Reserved for future issuance (in shares)     10,432,749
Share price (in dollars per share) $ 21.23    
Legacy Oklo 2016 Plan      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Award vesting rate (as a percent) 20.00%    
Award vesting period 5 years    
Award vesting commencement period 1 year    
Award expiration period 10 years    
Options, outstanding (in shares) 9,470,382    
Cost not yet recognized $ 9,635    
Stock option awards not vested (in shares) 483,748    
Cost not yet recognized, period for recognition 3 years 8 months 26 days    
Legacy Oklo 2016 Plan | Common Class A      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Reserved for future issuance (in shares)     9,470,382
The 2024 Plan      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Award expiration period 10 years    
Non-option equity instruments, outstanding (in shares) 1,386,998    
Reserved for future issuance (in shares) 15,872,516    
The 2024 Plan | Common Class A      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Reserved for future issuance (in shares)     15,872,516
Employee Stock Option | Common Class A      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Reserved for future issuance (in shares)     10,432,749
Fair value of options granted during the period $ 1,108 $ 11,343  
Grant date intrinsic value (in dollars per share) $ 3.15 $ 2.27  
Options exercised in period, intrinsic value $ 28,537 $ 1,112  
Options vested in period, fair value 2,916 $ 239  
Options exercisable, intrinsic value 64,930    
Options, vested and expected to vest, exercisable, aggregate intrinsic value $ 182,604    
Restricted Stock Units (RSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Non-option equity instruments, outstanding (in shares) 1,386,998    
Vested (in shares) 134,832    
Nonvested (in shares) 1,252,166 0  
Granted (in shares) 1,390,298    
Vested in period, aggregate intrinsic value $ 1,049    
Restricted Stock Units (RSUs) | The 2024 Plan      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Cost not yet recognized, period for recognition 2 years 11 months 19 days    
Cost not yet recognized $ 9,128    
Employee Stock      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Award expiration period 20 years    
Granted (in shares) 0    
Employee Stock | Common Class A      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Reserved for future issuance (in shares)     2,441,926