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Commitments and Contingencies - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended
Mar. 31, 2024
Nov. 30, 2023
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Loss Contingencies [Line Items]            
Prepaid expenses and other current assets     $ 5,481,000   $ 4,417,000  
Research and development expense [1]     19,572,000 $ 12,504,000    
NeuroPace Agreement            
Loss Contingencies [Line Items]            
Master services agreement, expiration period   3 years        
Prepaid expenses and other current assets           $ 1,500,000
Amount paid     300,000 300,000    
Research and development expense     500,000 300,000    
NeuroPace SOW            
Loss Contingencies [Line Items]            
Period cost covered 2 years          
Prepaid expenses and other current assets         $ 300,000  
Balance of prepaid expense $ 1,500,000   $ 100,000 $ 1,500,000    
NeuroPace SOW | Maximum            
Loss Contingencies [Line Items]            
Payment for service provided $ 3,700,000          
[1] Includes related party amounts of zero and less than $0.1 million for the three months ended March 31, 2025 and 2024, respectively (see Note 10).