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Commitments and Contingencies - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
		Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Loss Contingencies [Line Items]
Prepaid expenses and other current assets			$ 9,690,000		$ 9,690,000		$ 4,417,000
Research and development expense	[1]		22,680,000	$ 15,689,000	42,252,000	$ 28,193,000
NeuroPace Agreement
Loss Contingencies [Line Items]
Amount paid					900,000
Research and development expense					1,100,000
NeuroPace SOW
Loss Contingencies [Line Items]
Period cost covered		2 years
Prepaid expenses and other current assets							$ 300,000
Balance of prepaid expense			$ 100,000		$ 100,000
NeuroPace SOW | Maximum
Loss Contingencies [Line Items]
Payment for service provided		$ 3,700,000
[1] Includes related party amounts of zero for each of the three months ended June 30, 2025 and 2024, and zero and less than $0.1 million for the six months ended June 30, 2025 and 2024, respectively (see Note 10).

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