Long-term Debt - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2026 USD ($) Tranche	Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Dec. 17, 2024 USD ($)
Debt Instrument [Line Items]
Number Of Tranches \| Tranche	3
Interest expense	$ 1,292	$ 1,361
Principal amount of term loans	$ 50,000			$ 50,000
Loan And Security Agreement [Member] \| Oxford [Member]
Debt Instrument [Line Items]
Debt instrument, face amount					$ 200,000
Debt instrument interest period	60 months
Debt instrument term	72 months
Debt Instrument interest rate stated percentage	5.50%
Debt instrument payment terms	the loan carries an interest-only period of 60 months and a total term of 72 months. The term loan accrues interest, payable monthly, at a floating rate equal to, subject to certain conditions, (a) 1-month term SOFR plus (b) 5.50%. As a result of a milestone achieved in 2025, the term loan will begin to amortize in equal monthly installments beginning on February 1, 2030, through the maturity date of December 1, 2030
Debt instrument date of first required payment	Feb. 01, 2030
Debt instrument date of final required payment	Dec. 01, 2030
Debt instrument maturity date description	milestone achieved in 2025, the term loan will begin to amortize in equal monthly installments beginning on February 1, 2030, through the maturity date of December 1, 2030
Final principal fee payment percentage				6.50%
Debt instrument final interest payment	$ 3,300
Amount borrowed	50,000
Long-term accrued interest payable	661			$ 525
Loan issuance costs	174
Principal amount of term loans	$ 50,000
Percentage of increase in applicable rate of interest under termination of the lenders' commitments	5.00%
Loan And Security Agreement [Member] \| Oxford [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Principal amount of term loans	$ 50,000
Loan And Security Agreement [Member] \| FDA Approval OF VYKATXR Tranche one [Member] \| Oxford [Member]
Debt Instrument [Line Items]
Debt instrument additional borrowing amount			$ 50,000
Debt instrument date of final borrowings			Sep. 30, 2025
Loan And Security Agreement [Member] \| Contingent upon certain commercial milestones [Member] \| Oxford [Member]
Debt Instrument [Line Items]
Debt instrument additional borrowing amount	100,000
Loan And Security Agreement [Member] \| Mutual Consent of Soleno and Oxford [Member] \| Oxford [Member]
Debt Instrument [Line Items]
Debt instrument additional borrowing amount	$ 100,000

SOLENO THERAPEUTICS INC 10-Q