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Events after reporting period - Additional Information (Detail) £ / shares in Units, £ in Millions	Oct. 18, 2022 GBP (£)	Jul. 08, 2022 $ / shares £ / shares shares
Announcing Or Commencing Implementation Of Operating Plan [Member]
Statement [Line Items]
Percentage of targeted reduction in the employee base	40.00%
Estimated expenses related to employee severance and other termination benefits to be incurred | £	£ 0.5
ADS [Member] | Major ordinary share transactions [member]
Statement [Line Items]
Par value per share | £ / shares		£ 0.003
Number of shares outstanding		124,918,284
Ordinary shares [member] | Major ordinary share transactions [member]
Statement [Line Items]
Number of shares issued		40,020,280
Proceeds from issue of ordinary shares		8,004,056
Share conversion price per share | $ / shares		£ 0.174

X

- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2021-03-24

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X

- Definition

The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 79
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iv&doctype=Standard
-URIDate 2021-03-24

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X

- Definition

The nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 79
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iii&doctype=Standard
-URIDate 2021-03-24

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X

- Definition

American depositary shares.

+ References

No definition available.

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- Definition

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+ References

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+ Details

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X

- Definition

Percentage of targeted reduction in the employee base.

+ References

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+ Details

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- Definition

Share conversion price per share.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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