Preferred Stock and Stockholders' Equity - Schedule of Assumptions Used in Black-Scholes Option Pricing Model to Determine Fair Value of Stock Options Granted (Detail) - Securities Purchase Agreement [Member] - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	3.60%	4.40%
Expected stock price volatility	95.10%	96.40%
Expected term (in years)	2 years 9 months 18 days	3 years 6 months
Share Price	$ 2.59	$ 4.14

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Eledon Pharmaceuticals, Inc. 10-Q