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Warrants - Movement in Value (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Warrant Activity
At January 1	$ 2,246
Fair value adjustment	(2,246)
At December 31	$ 0

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Fair Value Adjustment

+ References

No definition available.

+ Details

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Namespace Prefix:	vrna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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