v3.25.4
Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended 24 Months Ended 27 Months Ended
Jun. 24, 2024
USD ($)
May 13, 2024
$ / shares
shares
Oct. 02, 2023
USD ($)
Sep. 14, 2022
day
$ / shares
Dec. 31, 2025
USD ($)
vote
$ / shares
shares
Dec. 31, 2025
USD ($)
vote
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
vote
$ / shares
shares
Mar. 01, 2022
$ / shares
shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Shares authorized (in shares)         1,000,000,000 1,000,000,000     1,000,000,000  
Common stock, authorized (in shares)         950,000,000 950,000,000 950,000,000   950,000,000  
Common stock, par value (in dollars per share) | $ / shares         $ 0.0001 $ 0.0001 $ 0.0001   $ 0.0001  
Preferred stock, shares authorized (in shares)         50,000,000 50,000,000 50,000,000   50,000,000  
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.0001 $ 0.0001 $ 0.0001   $ 0.0001  
Holders of common stock, number of votes for each share held | vote         1 1     1  
Fair value of options vested | $             $ 700      
Unrecognized compensation cost | $         $ 600 $ 600     $ 600  
Exercise price (in dollars per share) | $ / shares   $ 1.10               $ 11.50
Exercised (in shares)           200,100        
Proceeds from issuance of common stock upon exercise of stock warrants | $           $ 2,301 14,384      
Stock issuance costs | $             (800)      
Increase in fair value of modified stock warrants | $           $ 0 727      
Number of securities called by each warrant (in shares)                   1
Deferred stock issuance cost | $             $ 100      
Sales Agreement                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Aggregate offering price | $     $ 100,000              
Number of shares issued in transaction (in shares)           1,800,000     25,500,000  
Proceeds from the sale of shares of common stock | $           $ 65,300     $ 100,000  
Sales commissions and fees | $           $ 1,700   $ 2,500    
Sale of stock, aggregate offering capacity utilized | $                 100,000  
Sales Agreement | Common Stock                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
New shares issued (in shares)           10,719,196 14,701,388      
Public warrants                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Exercised (in shares)   12,575,664       200,100        
Average price per share of redeemable warrants (in dollars per share) | $ / shares       $ 18.00            
Warrants, redeem, threshold trading days | day       20            
Warrants, redeem, threshold consecutive trading days | day       30            
Private warrants                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Exercised (in shares)   500,000     15,600,000 0        
New shares issued (in shares)         3,073,200          
Increase in fair value of modified stock warrants | $ $ 700                  
Private warrants | Common Stock                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Conversion ratio, stock warrant into common stock 0.197                  
PIPE warrants                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Exercise price (in dollars per share) | $ / shares       $ 12.50            
Exercised (in shares)           0        
Average price per share of redeemable warrants (in dollars per share) | $ / shares       $ 20.00            
Warrants, redeem, threshold trading days | day       20            
Warrants, redeem, threshold consecutive trading days | day       30            
Stock options                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Stock options, granted (in shares)           0        
Weighted average period (in years)           1 year        
RSUs                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Weighted average period (in years)           3 years        
Granted (in dollars per share) | $ / shares           $ 3.81 $ 2.39      
Fair value of vested RSUs | $           $ 5,000 $ 3,900      
Unrecognized compensation cost | $         $ 16,800 $ 16,800     $ 16,800  
Granted (in shares)           3,598,402        
2022 Plan                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Shares available for future issuance (in shares)         21,814,469 21,814,469     21,814,469  
Stock options, granted (in shares)           0 0      
Amprius Holdings Second Equity Incentive Plan | Stock options                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Estimated grant date, price per share (in dollars per share) | $ / shares           $ 0.34        
Expected term           5 years        
Volatility rate           75.00%        
Risk free interest rate           3.60%        
Dividend rate           0.00%        
Equity Incentive Plans                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Exercise price as a percentage of fair value           100.00%        
Optionee stockholder percentage for option price           10.00%        
Exercise price as a percentage of fair value, ten percent stockholders           110.00%        
Award expiration period (in years)           10 years        
Fair value of options vested | $           $ 1,900 $ 3,300      
Intrinsic value of options exercised | $           $ 31,700 $ 4,200      
Equity Incentive Plans | Stock options                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Award vesting period (in years)           4 years        
Equity Incentive Plans | RSUs                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Award vesting period (in years)           4 years        
Employee Stock Purchase Plan | Stock options                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Reserved for issuance (in shares)         3,893,560 3,893,560     3,893,560  
Purchase price per share as a percentage of fair market value (percentage)           85.00%        
Employee Stock Purchase Plan | Stock options | Maximum                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Purchase period (in months)           27 months        
Executive Incentive Compensation Plan                    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                    
Granted (in shares)           0