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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).

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