Organization and Liquidity - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended				6 Months Ended
	Dec. 16, 2022	Jul. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Organization And Liquidity [Line Items]
Proceeds from issuance of common stock and pre-funded warrants							$ 500,000	$ 752,000
Accumulated deficit			$ 178,631,000				178,631,000		$ 165,789,000
Net loss			(2,605,000)	$ (10,249,000)	$ 375,000	$ (6,480,000)	(12,854,000)	(6,105,000)
Cash			$ 900,000		7,770,000		900,000	7,770,000	$ 5,783,000
Proceeds From Sale Of Other Assets 1					$ 17,000			$ 303,000
TuHURA Agreement
Organization And Liquidity [Line Items]
Payment received with consideration of agreement		$ 5,000,000
Additional payment received with consideration of agreement		150,000
TuHURA Agreement | Subsequent Event
Organization And Liquidity [Line Items]
Payment received with consideration of agreement		5,000,000
Additional payment received with consideration of agreement		150,000
TuHURA Agreement | Maximum [Member]
Organization And Liquidity [Line Items]
Additional payment received with consideration of agreement		300,000
TuHURA Agreement | Maximum [Member] | Subsequent Event
Organization And Liquidity [Line Items]
Additional payment received with consideration of agreement		$ 300,000
Private Placement [Member]
Organization And Liquidity [Line Items]
Proceeds from issuance of common stock and pre-funded warrants	$ 7,400,000
Merger Agreement
Organization And Liquidity [Line Items]
Issuance of common stock, shares	649,346
Proceeds from issuance of common stock and pre-funded warrants	$ 7,400,000
Rights from Private Placement							$ 22,500,000