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Fair value measurement - BMS warrants - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) item	Dec. 31, 2020 USD ($)
Collaboration arrangements
Number of warrant types | item	2
Number of Collaboration Targets | item	4
Collaboration Agreement, Cash Payable | $	$ 70.0	$ 70.0
Non-current liabilities
Collaboration arrangements
Fair value of the derivative financial liability | $	$ 2.6	$ 2.6
Collaboration Agreement, If 70 Million Is Greater Than Five Percent Of Net Proceeds | Derecognition Of Warrants
Collaboration arrangements
Threshold Percentage Of Net Proceeds	5.0
Percentage Of Net Proceeds Payable	5
Collaboration Agreement, If 70 Million Is Lesser Than One Percent Of Net Proceeds | Derecognition Of Warrants
Collaboration arrangements
Threshold Percentage Of Net Proceeds		1
Percentage Of Net Proceeds Payable		1

X

- Definition

The amount of non-refundable, non-creditable cash payment to be made under the collaboration agreement.

+ References

No definition available.

+ Details

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X

- Definition

The number of collaboration targets.

+ References

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+ Details

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X

- Definition

Number of warrant types are issued.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of net proceeds payable under the arrangement.

+ References

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- Definition

The threshold percentage of net proceeds payable under the arrangement.

+ References

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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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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

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