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Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Share-Based Payment Arrangement, Noncash Expense [Abstract]    
Number of Shares Underlying Outstanding Options, Beginning balance 14,965,270  
Number of Shares Underlying Outstanding Options, Options granted 5,040,276  
Number of Shares Underlying Outstanding Options, Options exercised 0  
Number of Shares Underlying Outstanding Options, Options forfeited or cancelled (1,820,726)  
Number of Shares Underlying Outstanding Options, Ending balance 18,184,820 14,965,270
Number of Shares Underlying Outstanding Options exercisable 8,306,140  
Number of Shares Underlying Outstanding Options, Vested and expected to vest 18,184,820  
Weighted-Average Exercise Price, Outstanding beginning $ 3.09  
Weighted-Average Exercise Price, Options granted 0.87  
Weighted-Average Exercise Price, Options exercised 0  
Weighted-Average Exercise Price, Options forfeited or cancelled 2.21  
Weighted-Average Exercise Price, Outstanding ending 2.56 $ 3.09
Weighted-Average Exercise Price, Options exercisable 3.32  
Weighted-Average Exercise Price, Vested and expected to vest $ 2.56  
Weighted-Average Remaining Contract Term, Outstanding 8 years 2 months 12 days 8 years 1 month 6 days
Weighted-Average Remaining Contract Term, Options exercisable 7 years 3 months 18 days  
Weighted-Average Remaining Contract Term, Vested and expected to vest 8 years 2 months 12 days  
Aggregate Intrinsic Value, Outstanding $ 6 $ 0
Aggregate Intrinsic Value, Options exercisable 0  
Aggregate Intrinsic Value, Vested and expected to vest $ 6