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Stockholders' equity - Common stock (Details) - shares	Sep. 30, 2022	Dec. 31, 2021
Common stock
Number of shares reserved for future issuance (in shares)	12,418,052	9,199,512
Share-based payments | Stock options
Common stock
Number of shares reserved for future issuance (in shares)	10,524,780	8,342,429
Share-based payments | Restricted stock units
Common stock
Number of shares reserved for future issuance (in shares)	1,870,682	817,609
Warrants
Common stock
Number of shares reserved for future issuance (in shares)	22,590	39,474

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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