Stockholders' Equity - Additional Information (Detail) - USD ($)										3 Months Ended
	Oct. 30, 2024	Oct. 29, 2024	Oct. 01, 2024	Sep. 30, 2024	Sep. 20, 2024	Jul. 08, 2024	May 06, 2024	May 05, 2023	Apr. 28, 2023	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2025	Dec. 31, 2024	Jul. 11, 2024	May 09, 2024	May 07, 2024	Jan. 30, 2024	Dec. 31, 2023	Nov. 06, 2023	Nov. 02, 2023	Jul. 14, 2023	Jul. 10, 2023
Class Of Stock [Line Items]
Debt outstanding										$ 0
Common stock, shares issued										59,881,775			59,789,275
Common stock par value										$ 0.001			$ 0.001
Net proceeds after deducting offering costs											$ 1,000
Convertible preferred stock, shares authorized										5,000,000
Convertible preferred stock, par value										$ 0.001
Percentage of exchange offer by third party to common stockholders										50.00%
Subsequent Event [Member]
Class Of Stock [Line Items]
Common stock par value												$ 0.001
Underwriting Agreement [Member] \| Leerink Partners LLC [Member]
Class Of Stock [Line Items]
Proceeds from issuance offering	$ 85,000,000
Net proceeds after deducting offering costs	$ 79,500,000
Armistice Capital Master Fund Ltd [Member] \| Securities Purchase Agreement [Member]
Class Of Stock [Line Items]
Number of pre-funded warrants exercised for common stock														240,000		583,000	600,000			653,000		501,197
Common stock, shares issued														240,000	583,000		600,000		653,000		501,197
Warrant exercise price per share														$ 0.001		$ 0.001	$ 0.001			$ 0.001		$ 0.001
Series X1 Preferred Stock [Member]
Class Of Stock [Line Items]
Warrants available for exercise										50,207.419
Shares of common stock issued upon conversion of each share of preferred stock										2,789,301
Series X1 Non-voting Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Convertible preferred stock, shares authorized										515,000	515,000		515,000					515,000
Convertible preferred stock, par value										$ 0.001	$ 0.001		$ 0.001					$ 0.001
Convertible preferred stock, shares outstanding										110,086	110,086		110,086					110,086
Convertible preferred stock, shares issued										110,086	110,086		110,086					110,086
Series X Non-Voting Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Convertible preferred stock, shares authorized										10,000	10,000		10,000					10,000
Convertible preferred stock, par value										$ 0.001	$ 0.001		$ 0.001					$ 0.001
Convertible preferred stock, shares outstanding										4,422	4,422		4,422					4,422
Convertible preferred stock, shares issued										4,422	4,422		4,422					4,422
Common Stock [Member]
Class Of Stock [Line Items]
Warrants available for exercise										33,052,744
Shares of common stock issued upon conversion of each share of preferred stock										55.5556
Common Stock [Member] \| Underwriting Agreement [Member] \| Leerink Partners LLC [Member]
Class Of Stock [Line Items]
Conversion of stock, shares issued		18,356,173
Stock price per share		$ 3.65
Common stock warrants exercisable		4,931,507
Warrant exercise price per share		$ 0.001
Warrants [Member] \| Underwriting Agreement [Member] \| Leerink Partners LLC [Member]
Class Of Stock [Line Items]
Warrant exercise price per share		$ 3.649
Pre-funded Warrants [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Class of Warrant Subject to Specified Beneficial Ownership Limitations Percentage									9.99%
Common Stock Warrants [Member]
Class Of Stock [Line Items]
Warrants available for exercise										33,052,744			33,052,744
Common Stock Warrants [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Class of Warrant Subject to Specified Beneficial Ownership Limitations Percentage									9.99%
Private Placement Warrants [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Warrant exercise price per share									$ 3
Private Placement Warrants [Member] \| Securities Purchase Agreement [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Common stock, shares issued							13,110,484
Stock price per share							$ 2.37
Gross proceeds							$ 50,000,000
Net proceeds after deducting offering costs							$ 48,100,000
Private Placement Warrants [Member] \| Securities Purchase Agreement Initial Closing [Member]
Class Of Stock [Line Items]
Common warrants issued								$ 35,000,000
Net proceeds after deducting offering costs								$ 33,000,000
Private Placement Warrants [Member] \| Securities Purchase Agreement Initial Closing [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Common stock, shares issued									15,151,518
Common stock par value									$ 0.001
Common stock warrants exercisable									15,151,518
Private Placement Warrants [Member] \| Securities Purchase Agreement Second Closing [Member]
Class Of Stock [Line Items]
Common stock, shares issued						909,088
Proceeds from issuance of common stock						$ 2,100,000
Net proceeds after deducting offering costs						$ 2,000,000
Private Placement Warrants [Member] \| Securities Purchase Agreement Second Closing [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Common stock, shares issued									20,202,024
Private Placement Warrants [Member] \| Securities Purchase Agreement Third Closing [Member]
Class Of Stock [Line Items]
Common stock, shares issued			1,727,400	1,727,400
Proceeds from issuance of common stock			$ 4,000,000	$ 4,000,000
Net proceeds after deducting offering costs			$ 3,800,000	$ 3,800,000
Private Placement Warrants [Member] \| Securities Purchase Agreement Third Closing [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Common stock, shares issued									25,252,530
Private Placement Warrants [Member] \| Common Stock [Member] \| Securities Purchase Agreement Initial Closing [Member]
Class Of Stock [Line Items]
Common stock, shares issued								8,730,168
Private Placement Warrants [Member] \| Pre-funded Warrants [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Warrant exercise price per share									$ 0.001
Private Placement Warrants [Member] \| Pre-funded Warrants [Member] \| Securities Purchase Agreement [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Stock price per share							$ 2.369
Common stock warrants exercisable							7,989,516
Warrant exercise price per share							$ 0.001
Private Placement Warrants [Member] \| Pre-funded Warrants [Member] \| Securities Purchase Agreement Initial Closing [Member]
Class Of Stock [Line Items]
Common stock, shares issued								6,421,350
Maximum [Member] \| Common Stock [Member] \| Series X1 Non-voting Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Conversion of preferred stock, conversion blocker, percent										9.99%
Maximum [Member] \| Common Stock [Member] \| Series X Non-Voting Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Conversion of preferred stock, conversion blocker, percent										9.99%
Maximum [Member] \| Pre-funded Warrants [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Class of Warrant Subject to Specified Beneficial Ownership Limitations Percentage							9.99%
Class of Warrant Subject to Specified Beneficial Ownership Limitations Permitted Percentage							19.99%		19.99%
Maximum [Member] \| Pre-funded Warrants [Member] \| Underwriting Agreement [Member] \| Leerink Partners LLC [Member]
Class Of Stock [Line Items]
Class of Warrant Subject to Specified Beneficial Ownership Limitations Percentage		9.99%
Maximum [Member] \| Common Stock Warrants [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Class of Warrant Subject to Specified Beneficial Ownership Limitations Permitted Percentage									19.99%
Minimum [Member] \| Common Stock [Member] \| Series X1 Non-voting Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Conversion of preferred stock, conversion blocker, percent										9.90%
Minimum [Member] \| Common Stock [Member] \| Series X Non-Voting Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Conversion of preferred stock, conversion blocker, percent										9.90%
Minimum [Member] \| Pre-funded Warrants [Member] \| Accredited Investor [Member]
Class Of Stock [Line Items]
Class of Warrant Subject to Specified Beneficial Ownership Limitations Percentage							4.99%
Minimum [Member] \| Pre-funded Warrants [Member] \| Underwriting Agreement [Member] \| Leerink Partners LLC [Member]
Class Of Stock [Line Items]
Class of Warrant Subject to Specified Beneficial Ownership Limitations Percentage		4.99%
Guggenheim Securities LLC [Member] \| Maximum [Member] \| Equity Distribution Agreement [Member]
Class Of Stock [Line Items]
Proceeds from issuance of common stock					$ 75,000,000

Eledon Pharmaceuticals, Inc. 10-Q/A