Long-Term Debt - Additional Information (Details) - USD ($)				12 Months Ended	14 Months Ended
	Jul. 19, 2024	Jun. 16, 2023	Apr. 18, 2022	Dec. 31, 2024	Jun. 15, 2023	Nov. 09, 2023
Long Term Debt [Line Items]
Repayment of outstanding principal and interest				$ 27,497,000
Loss on extinguishment of debt				(1,853,000)
Loan Agreement
Long Term Debt [Line Items]
Repayment of outstanding principal and interest	$ 26,200,000
Final payment amount	28,500,000
Final payment fee and prepayment fee	$ 2,300,000
Loss on extinguishment of debt				(1,900,000)
Term Loan
Long Term Debt [Line Items]
Interest expense				1,500,000
Debt instrument, accretion of final payment fee				300,000
PIK interest				400,000
Debt instrument, coupon interest				$ 700,000
Term Loan \| Loan Agreement
Long Term Debt [Line Items]
Debt instrument, interest rate			4.55%	6.05%
Debt instrument, maximum borrowing capacity			$ 75,000,000
Debt instrument, amount borrowed					$ 15,000,000
Debt instrument, minimum draw amount						$ 5,000,000
Debt instrument, basis spread on variable rate			5.00%
Debt instrument, interest rate per annum			2.85%
Debt instrument, payment terms			The monthly payments consist of interest-only through June 1, 2025 or, if prior to April 30, 2025, the Company achieves the Tranche 3 Milestone, subject to reasonable verification by Hercules, through June 1, 2026. Subsequent to the interest-only period, the Term Loans will be payable in equal monthly installments of principal, plus accrued and unpaid interest, through the maturity date of May 1, 2027.
Debt instrument, maturity date			May 01, 2027
Debt instrument, final payment fee			$ 2,145,000	$ 2,100,000
Percentage of original principal amount payable			7.15%
Financing costs				$ 200,000
Percentage of interest upon event of default			4.00%
Term Loan \| Loan Agreement \| Maximum
Long Term Debt [Line Items]
Percentage of prepayment fee on outstanding principal balance			0.50%
Term Loan \| Prime Rate \| Loan Agreement
Long Term Debt [Line Items]
Debt instrument, basis spread on variable rate			1.05%
Term Loan 1 Borrowing through June 30, 2023 \| Term Loan 1 \| Loan Agreement
Long Term Debt [Line Items]
Debt instrument, amount borrowed		$ 10,000,000
Term Loan 1 Borrowing through June 30, 2023 \| Term Loan 1 \| Loan Agreement \| Maximum
Long Term Debt [Line Items]
Debt instrument, available credit under loan agreement					15,000,000
Term Loan 1 Borrowing December 1, 2023 through May 31, 2024 \| Term Loan 1 \| Loan Agreement \| Maximum
Long Term Debt [Line Items]
Debt instrument, available credit under loan agreement		$ 5,000,000
Term Loan 1 Borrowing January 1, 2024 through July 19, 2024 \| Term Loan 1 \| Loan Agreement \| Maximum
Long Term Debt [Line Items]
Debt instrument, available credit under loan agreement						$ 5,000,000
Term Loan 2 Borrowing through June 30, 2023 \| Term Loan 2 \| Loan Agreement \| Maximum
Long Term Debt [Line Items]
Debt instrument, available credit under loan agreement					20,000,000
Term Loan 3 Borrowing through March 31, 2024 \| Term Loan 3 \| Loan Agreement \| Maximum
Long Term Debt [Line Items]
Debt instrument, available credit under loan agreement					$ 25,000,000

HilleVax, Inc. 10-K