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Financial instruments, Interest-bearing loans and borrowings (Details) £ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 GBP (£) Tranche	Nov. 06, 2020 USD ($) Tranche	Mar. 31, 2020 USD ($)	Mar. 02, 2020 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 USD ($)	Sep. 13, 2017 USD ($)
Financial liabilities: interest-bearing loans and borrowings [Abstract]
Borrowings | £		£ 36,654				£ 0
Oxford Finance Agreement [Member]
Financial liabilities: interest-bearing loans and borrowings [Abstract]
Borrowings, maximum capacity			$ 100,000,000
Number of tranches | Tranche			3
Maturity date for monthly payments of principal and interest	Nov. 30, 2025
Accrued interest and a prepayment fee	$ 10,000,000
Oxford Finance Agreement [Member] | LIBOR [Member]
Financial liabilities: interest-bearing loans and borrowings [Abstract]
Borrowings, interest rate		8.85%
Oxford Finance Agreement [Member] | LIBOR [Member] | Bottom of Range [Member]
Financial liabilities: interest-bearing loans and borrowings [Abstract]
Borrowings, interest rate		9.01%
Oxford Finance Agreement [Member] | LIBOR [Member] | Top of Range [Member]
Financial liabilities: interest-bearing loans and borrowings [Abstract]
Borrowings, interest rate		12.01%
Oxford Finance Agreement, Tranche One [Member]
Financial liabilities: interest-bearing loans and borrowings [Abstract]
Borrowings			$ 50,000,000
Oxford Finance Agreement, Tranche Two [Member]
Financial liabilities: interest-bearing loans and borrowings [Abstract]
Borrowings			25,000,000
Oxford Finance Agreement, Tranche Three [Member]
Financial liabilities: interest-bearing loans and borrowings [Abstract]
Borrowings, remaining amount			$ 25,000,000
Gates Foundation Convertible Loan [Member]
Financial liabilities: interest-bearing loans and borrowings [Abstract]
Borrowings, maximum capacity								$ 40,000,000
Number of tranches | Tranche		2
Borrowings				$ 25,000,000	$ 25,000,000		$ 25,500,000
Borrowings interest rate for first twelve months		2.00%
Borrowings interest rate after one year		0.00%
Gates Foundation Convertible Loan [Member] | First Tranche [Member]
Financial liabilities: interest-bearing loans and borrowings [Abstract]
Borrowings					$ 25,000,000
Borrowings interest rate for first twelve months						2.00%	2.00%

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
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-URIDate 2020-01-01

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard
-URIDate 2020-01-01

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- Definition

The amount of accrued interest and a prepayment fee.

+ References

No definition available.

+ Details

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- Definition

The interest rate of borrowings after one year.

+ References

No definition available.

+ Details

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- Definition

The interest rate of borrowings for first twelve months.

+ References

No definition available.

+ Details

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- References

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- Definition

Remaining borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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- Definition

The amount maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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+ Details

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- Definition

Interest-only period will be followed by equal monthly payments of principal and interest to the maturity date in November 2025.

+ References

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- Definition

The number of tranches the amount being agreed to lend to Group.

+ References

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