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Fair value of financial assets and liabilities - Financial Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash equivalents	$ 212,833	$ 23,456
Short-term investments		14,998
Assets	212,833	38,454
Liabilities
Preferred stock warrant liability		4,117
Liabilities		4,117
Level 1
Assets
Cash equivalents	212,833	23,456
Short-term investments		14,998
Assets	$ 212,833	38,454
Level 3
Liabilities
Preferred stock warrant liability		4,117
Liabilities		$ 4,117

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- Definition

Fair value of preferred stock warrant liability.

+ References

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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- Definition

Fair value of financial and nonfinancial obligations.

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-Topic 820
-SubTopic 10
-Section 50
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