Summary of significant accounting policies - Additional Information (Details)		3 Months Ended
Oct. 14, 2021	Mar. 31, 2022 Customer	Mar. 31, 2021 Customer
Financing Receivable Impaired [Line Items]
Reverse stock split	1-for-6.046
Reverse stock split ratio	0.165
Number of customer accounted for accounts receivable or revenue		0	0

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.

No definition available.

+ Details

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Period Type:	duration

- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770

+ Details

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- Definition

Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 4.C)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770

+ Details

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- Definition

Number of customer accounted for accounts receivable or revenue.

+ References

No definition available.

+ Details

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Namespace Prefix:	utrs_
Data Type:	xbrli:integerItemType
Balance Type:	na
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