Common Stock (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended					3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 07, 2022	Oct. 05, 2022	Jul. 12, 2021	Aug. 31, 2023	Dec. 31, 2022	Oct. 31, 2022	Aug. 31, 2021	Mar. 31, 2021	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2021
Class of Warrant or Right [Line Items]
Excercise price, per share				$ 0.001		$ 0.001
Proceeds from issuance of common stock, net												$ 3,794
Common stock, par value					$ 0.0001				$ 0.0001			$ 0.0001
Research and development									$ 175		$ 6,118	$ 10,374	$ 18,916
Common Stock [Member]
Class of Warrant or Right [Line Items]
Issuance of common stock in registered direct offering, net of issuance costs, shares									4,000,000			10,000,000
Securities Purchase Agreement [Member]
Class of Warrant or Right [Line Items]
Issuance of common stock in registered direct offering, net of issuance costs, shares	5,168,732	1,800,000			5,168,732		1,300,000	1,037,405
Purchase of warrant shares		5,407,208
Shares issued, price per share	$ 0.938	$ 1.11			$ 0.94
Gross proceeds				$ 2,000		$ 8,000	$ 25,000	$ 7,000
Proceeds from issuance of common stock, net	$ 4,850	$ 8,000		$ 1,700	$ 5,000	$ 7,900	$ 22,600	$ 6,400
Common stock, par value	$ 0.0001	$ 0.0001			$ 0.0001			$ 0.0001
Warrants granted for services					$ 200
Unregistered warrant to purchase shares		7,207,208
Medimmune Limited License Agreement [Member]
Class of Warrant or Right [Line Items]
Research and development														$ 6,500
Medimmune Limited License Agreement [Member] | Common Stock [Member]
Class of Warrant or Right [Line Items]
Stock issued shares			884,956
Stock issued value			$ 6,500
Prefunded Warrants [Member] | Securities Purchase Agreement [Member]
Class of Warrant or Right [Line Items]
Purchase of warrant shares							3,647,556
Excercise price, per share							$ 0.001
Securities Purchase Agreement [Member] | Common Stock [Member]
Class of Warrant or Right [Line Items]
Proceeds from issuance of common stock, net										$ 2,280
Number of shares										6,000,000
Common stock, par value										$ 0.0001
Share price										$ 0.38
Proceeds from issuance of stock										$ 2,100
Securities Purchase Agreement [Member] | Prefunded Warrants [Member]
Class of Warrant or Right [Line Items]
Issuance of common stock in registered direct offering, net of issuance costs, shares				4,000,000		1,800,000
Purchase of warrant shares				6,000,000		5,407,208
Shares issued, price per share				$ 0.20		$ 1.11
Excercise price, per share				$ 0.1999		$ 1.109
Securities Purchase Agreement [Member] | Prefunded Warrants [Member] | Maximum [Member]
Class of Warrant or Right [Line Items]
Purchase of warrant shares				10,000,000		7,207,208