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Cover - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 27, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-40337    
Entity Registrant Name NEUROPACE, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 22-3550230    
Entity Address, Address Line One 455 N. Bernardo Avenue    
Entity Address, City or Town Mountain View    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94043    
City Area Code 650    
Local Phone Number 237-2700    
Title of 12(b) Security Common Stock, $0.001 par value per share    
Trading Symbol NPCE    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 50,011,008
Entity Common Stock, Shares Outstanding   25,099,051  
Documents Incorporated by Reference Portions of the registrant's definitive proxy statement for the 2023 Annual Meeting of Stockholders, or the Proxy Statement, are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein. The Proxy Statement will be filed with Securities and Exchange Commission within 120 days of the registrant's fiscal year ended December 31, 2022.    
Entity Central Index Key 0001528287    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false