Shareholders' (Deficit) Equity - Additional Information (Details) $ / shares in Units, $ in Thousands			1 Months Ended				6 Months Ended
	May 31, 2024 $ / shares shares	Mar. 31, 2023 USD ($) $ / shares shares	May 31, 2024 USD ($) $ / shares shares	Mar. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Mar. 04, 2024 $ / shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2020 £ / shares
Class of Stock [Line Items]
Number of shares authorized | shares					45,122,321,523		45,122,321,523	35,000,000,000
Net proceeds from sale of shares							$ 8,820	$ 3,502
Nominal value of ADS (in per warrant ADS) | (per share)		$ 0.0001		$ 0.0001	$ 0.0001		$ 0.0001	$ 0.0001		$ 0.0001	£ 0.01
Capital redemption reserve					$ 52,194		$ 52,194			$ 50,600
Deferred shares issued | shares										3,847,331,913
Deferred shares issued price per share | $ / shares										$ 0.01315
Aggregate nominal value cancelled per share | $ / shares										$ 0.01
Aggregate nominal value cancelled										$ 50,600
Ordinary Shares
Class of Stock [Line Items]
Nominal value of ADS (in per warrant ADS) | $ / shares									$ 0.0001
Capital redemption reserve										$ 1,600
ADS | Ordinary Shares
Class of Stock [Line Items]
Number of ordinary shares representing one ADS | shares								2,000
ADS | Series C Warrants
Class of Stock [Line Items]
Purchase price of share | $ / shares			$ 1.885
Warrants issued to purchase ADS (in shares) | shares	4,029,754		4,029,754
Term of the warrants	3 years		3 years
Private Placement | Placement agent
Class of Stock [Line Items]
Estimated fair value of the placement agent warrants			$ 400	$ 200		$ 100
Private Placement | ADS
Class of Stock [Line Items]
Aggregate ADSs issued (in shares) | shares	4,029,754			1,320,614	947,868	551,816
Price per share | $ / shares				$ 1.48	$ 2.11	$ 3.3
Aggregate gross proceeds			$ 7,600
Percentage of the price per ADS for exercise price				125.00%		125.00%
Warrant expiration date	May 31, 2029		May 31, 2029			Oct. 06, 2028
Net proceeds from sale of shares			$ 7,000	$ 1,700	$ 1,800
Gross proceeds from private placement				$ 2,000	$ 2,000
Warrants issued to purchase ADS (in shares) | shares	332,380		332,380	132,061		42,550
Exercise price of warrants | $ / shares	$ 1.885		$ 1.885	$ 1.85		$ 4.13
Private Placement | ADS | Pre-Funded Warrants
Class of Stock [Line Items]
Purchase price of share | $ / shares						$ 3.1
Aggregate gross proceeds						$ 2,000
Net proceeds from sale of shares						$ 1,700
Warrants issued to purchase ADS (in shares) | shares						48,387
Exercise price of warrants | $ / shares						$ 0.2
Private Placement | ADS | Series C Warrants
Class of Stock [Line Items]
Exercise price of warrants | $ / shares	1.76		1.76
Private Placement | Dr. Prudo and Dr. Patel | ADS | Series C Warrants
Class of Stock [Line Items]
Exercise price of warrants | $ / shares	$ 1.79		$ 1.79
Registered direct offering | ADS
Class of Stock [Line Items]
Aggregate ADSs issued (in shares) | shares		1,333,333
Price per share | $ / shares		$ 3
Proceeds from issuance of shares		$ 4,000
Net proceeds from sale of shares		$ 3,500