Convertible Debt - Additional Information (Details)		4 Months Ended
Convertible Debt - Additional Information (Details)	Jul. 25, 2024 USD ($) Days $ / shares	Dec. 31, 2025 USD ($)	Oct. 31, 2025 USD ($)	Jul. 31, 2024 USD ($)	May 31, 2024 USD ($)
Convertible Term Loan [Member]
Convertible Debt [Line Items]
Debt Conversion, Description	conversion price equal to the greater of (i) $4.854, subject to customary adjustment provisions, and (ii) the lower of (a) 150% of the average of the closing sale price of our common stock during the 10 trading days preceding the effective date of such tranche and (b) 150% of the closing sale price of our common stock on the trading day immediately preceding the effective date of such tranche.
SVB [Member] \| Contingent Convertible Debt Agreement [Member] \| Convertible Term Loan [Member]
Convertible Debt [Line Items]
Convertible debt principal amount					$ 16,600,000
SVB and Lender [Member] \| Contingent Convertible Debt Agreement [Member] \| Convertible Term Loan [Member]
Convertible Debt [Line Items]
Convertible debt principal amount	$ 10,000,000			$ 10,000,000
Maturity date	Jun. 01, 2028
Stock trigger price \| $ / shares	$ 24
Convertible debt, interest rate	1.00%
Conversion price per share \| $ / shares	$ 7
Prepayment fee percentage on or after first anniversary	3.00%
Prepayment fee percentage occurs after first anniversary but on or prior to the second anniversary	2.00%
Prepayment fee percentage after second anniversary before maturity	1.00%
Prepayment fee percentage on original aggregate principal	4.00%
Threshold percentage of conversion amount of debt	50.00%
Convertible debt, stated rate	7.00%
Threshold consecutive trading days \| Days	10
Conversion price percentage of average closing sale price	150.00%
Conversion price percentage of closing trading share price	150.00%
SVB and Lender [Member] \| Contingent Convertible Debt Agreement [Member] \| Convertible Term Loan [Member] \| Minimum [Member]
Convertible Debt [Line Items]
Conversion price per share \| $ / shares	$ 4.854
SVB and Lender [Member] \| Registration Rights Agreement [Member]
Convertible Debt [Line Items]
Share holding percentage of shares issued and outstanding	7.00%
SVB and Lender [Member] \| Subsequent Event [Member] \| Contingent Convertible Debt Agreement [Member] \| Convertible Term Loan [Member]
Convertible Debt [Line Items]
Convertible debt principal amount		$ 5,000,000	$ 5,000,000
Net cash proceeds from the sale and issuance of equity securities		$ 40,000,000

ACHIEVE LIFE SCIENCES, INC. 10-Q