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Commitments and Contingencies - Additional Information (Details)
 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Oct. 18, 2021
plaintiff
May 31, 2018
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Aug. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Apr. 01, 2021
installment
Oct. 01, 2020
May 31, 2019
USD ($)
Aug. 31, 2011
USD ($)
Loss Contingencies [Line Items]                            
Renewal term   5 years                        
Percent rental payment deferred     50.00%                      
Deferred rent, current     $ 300,000 $ 0   $ 0     $ 490,000          
Deferred rent, interest rate, annual rate                       8.00%    
Number of deferred rent installments | installment                     3      
Operating leases, rent expense         $ 700,000   $ 2,100,000              
Deferred rent credit                 1,400,000          
Operating lease cost       $ 700,000   $ 2,000,000                
Operating lease term       7 years 9 months 18 days   7 years 9 months 18 days                
Operating lease percent       8.50%   8.50%                
Operating lease, payments           $ 2,100,000                
Purchase obligation, to be paid in the next twelve months               $ 2,400,000            
Percentage increase in purchase commitment               10.00%            
Indemnification liability accrued for officers and directors       $ 0   0     0          
Accrual for contingent liabilities       $ 0   $ 0     $ 0          
James Jacoby et al. v. NeuroPace, Inc., et al. [Member]                            
Loss Contingencies [Line Items]                            
Number of plaintiffs | plaintiff 3                          
Lease Facility                            
Loss Contingencies [Line Items]                            
Face amount                   $ 200,000     $ 700,000 $ 900,000
Minimum                            
Loss Contingencies [Line Items]                            
Annual rental payments   $ 2,800,000                        
Maximum                            
Loss Contingencies [Line Items]                            
Annual rental payments   $ 3,300,000