v3.26.1
Stock Incentive Plans - Schedule of Stock Option Activity (Details) - 2016 Plan, 2018 Inducement Incentive Award Plan and Old Cartesian Plan - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Number of Common Stock Options    
Beginning balance (in shares) 2,463,747  
Granted (in shares) 1,304,450  
Exercised (in shares) (86,132)  
Forfeited (in shares) (139,658)  
Ending balance (in shares) 3,542,407 2,463,747
Vested (in shares) 1,204,110  
Vested and expected to vest (in shares) 3,139,038  
Weighted-average Exercise Price ($)    
Beginning balance (in dollars per share) $ 13.72  
Granted (in dollars per share) 6.81  
Exercised (in dollars per share) 3.25  
Forfeited (in dollars per share) 15.90  
Ending balance (in dollars per share) 11.34 $ 13.72
Vested (in dollars per share) 11.35  
Vested and expected to vest (in dollars per share) $ 11.33  
Weighted-average Remaining Contractual Term (in years)    
Outstanding, term 7 years 8 months 26 days 6 years 4 months 28 days
Vested, term 5 years 1 month 9 days  
Vested and expected to vest, term 7 years 7 months 20 days  
Aggregate Intrinsic Value    
Outstanding $ 2,002 $ 2,962
Vested 1,926  
Vested and expected to vest $ 2,002