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Stock-based Compensation (Tables)
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]    
Schedule of stock option activity under the Company's equity incentive plan
Stock option activity under the Company’s equity incentive plan was as follows:
 
    
Options Outstanding
 
    
Number of

Options

(in thousands)
    
Weighted–

Average

Exercise

Price
    
Weighted-

Average

Remaining

Contractual

Life

(in years)
    
Aggregate

Intrinsic

Value

(in thousands)
 
Outstanding as of December 31, 2024
     49,157      $ 0.60        
Granted
     11,308        7.10        
Exercised
     (2,130      0.57        
Forfeited
     (1,902      1.40        
Expired
     (443      0.61        
           
  
 
 
    
 
 
       
Outstanding as of September 30, 2025
     55,990      $ 1.88        7.4      $ 553,256  
  
 
 
    
 
 
       
           
Exercisable as of September 30, 2025
     32,050      $ 0.62        6.3      $ 357,707  
  
 
 
    
 
 
       
           
Stock Option Activity
Stock option activity under the Company’s equity incentive plan was as follows:
 
    
Options Outstanding
 
    
Number of
Options
(in thousands)
    
Weighted–

Average
Exercise
Price
    
Weighted-
Average
Remaining
Contractual
Life

(in years)
    
Aggregate
Intrinsic
Value
(in thousands)
 
Outstanding as of December 31, 2023
     64,357      $   0.42        
Granted
     18,727        0.31        
Exercised
     (424      0.41        
Forfeited
     (4,780      0.42        
Cancelled
     (2,403      0.45        
Expired
     (1,266      0.39        
  
 
 
          
Outstanding as of December 31, 2024
     74,211      $ 0.39        7.6      $   8,729  
  
 
 
          
Exercisable as of December 31, 2024
     39,510      $ 0.41        6.6      $ 4,146  
  
 
 
          
Schedule of fair value of stock options granted was estimated at the grant-date using the Black-Scholes option-pricing model  
Fair Value of Stock Options
The fair value of stock options granted was estimated at the grant-date using the Black-Scholes option-pricing model using the following assumptions:
 
    
Year Ended December 31,
 
    
 2024 
  
   2023   
 
Expected volatility
   87.0% – 91.9%      59.4
Expected term (in years)
   5.1 – 6.1      6.0  
Risk-free interest rate
   3.6% – 4.3%      4.2
Expected dividend yield
   —       —   
Schedule of stock-based compensation recorded in the Company's statements of operations and comprehensive loss
Total stock-based compensation recorded in the Company’s condensed consolidated statements of operations and comprehensive loss was as follows (in thousands):
 
    
Three Months Ended

September 30,
    
Nine Months Ended
September 30,
 
    
2025
    
2024
    
2025
    
2024
 
Research and development
   $ 2,228      $ 1,029      $ 5,148      $ 2,518  
General and administrative
     2,475        421        3,952        988  
Truck and freight operations
     152        59        329        145  
Sales and marketing
     390        209        707        338  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total stock-based compensation
   $ 5,245      $ 1,718      $ 10,136      $ 3,989  
  
 
 
    
 
 
    
 
 
    
 
 
 
Stock-based Compensation
Total stock-based compensation recorded in the Company’s statements of operations and comprehensive loss was as follows (in thousands):
 
    
Year Ended December 31,
 
    
 2024 
    
 2023 
 
Research and development
   $  3,482      $  3,270  
General and administrative
     1,405        1,658  
Sales and marketing
     454        289  
Truck and freight operations
     209        182  
  
 
 
    
 
 
 
Total stock-based compensation
   $ 5,550      $ 5,399