Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	1 Months Ended								3 Months Ended				6 Months Ended
	Jun. 30, 2025 USD ($) $ / shares shares	Apr. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jul. 31, 2024 USD ($)	May 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jul. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2025 USD ($) $ / shares	Mar. 31, 2025 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($) Segment $ / shares	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Accounting Policies [Line Items]
Net loss									$ 6,462,000	$ 10,649,000	$ 14,435,000	$ 16,617,000	$ 17,100,000	$ 31,100,000
Cash flows used in operating activities													18,223,000	31,977,000
Accumulated deficit	$ 222,887,000								222,887,000				222,887,000		$ 205,776,000
Cash, cash equivalents and investments	71,200,000								71,200,000				$ 71,200,000
Number of operating segments | Segment													1
Number of reportable Segments | Segment													1
Assumed dividend yield													$ 0
Cash and cash equivalents	18,220,000								18,220,000				18,220,000		21,351,000
Investments	53,000,000								$ 53,000,000				53,000,000		$ 67,300,000
Maximum amount eligible to receive under cost-reimbursement contract award	18,300,000							$ 17,800,000
Award reduction amount	9,000,000
Maximum amount eligible to receive under cost-reimbursement cumulative contract award after reduction	$ 9,300,000
Net unrealized gain (loss) on available-for-sale investments													$ (300,000)	$ (300,000)
Exchange of common stock for pre-funded warrants, shares | shares	2,952,000
Nominal exercise price | $ / shares	$ 0.00001								$ 0.00001				$ 0.00001
NIAID Contract
Accounting Policies [Line Items]
Maximum amount eligible to receive under cost-reimbursement contract award	$ 18,300,000							17,800,000
Government contract fund increased amount		$ 500,000			$ 3,800,000		$ 700,000
UGARF
Accounting Policies [Line Items]
Grant award amount				$ 200,000				$ 1,400,000
BMGF
Accounting Policies [Line Items]
Grant award amount			$ 2,000,000			$ 1,800,000