Fair value measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair value measurements
Marketable securities	$ 26,870	$ 34,523
U.S. treasury securities
Fair value measurements
Marketable securities	26,870	29,548
U.S government agency securities
Fair value measurements
Marketable securities		4,975
Recurring basis
Fair value measurements
Cash equivalents		115,538
Marketable securities		34,523
Recurring basis \| Quoted Prices in Active Markets (Level 1)
Fair value measurements
Cash equivalents		115,538
Marketable securities		29,548
Recurring basis \| Significant Other Observable Inputs (Level 2)
Fair value measurements
Cash equivalents		0
Marketable securities		4,975
Recurring basis \| Significant Unobservable Inputs (Level 3)
Fair value measurements
Cash equivalents		0
Marketable securities		0
Recurring basis \| Money market funds
Fair value measurements
Cash equivalents	79,344	90,649
Recurring basis \| Money market funds \| Quoted Prices in Active Markets (Level 1)
Fair value measurements
Cash equivalents	79,344	90,649
Recurring basis \| Money market funds \| Significant Other Observable Inputs (Level 2)
Fair value measurements
Cash equivalents	0	0
Recurring basis \| Money market funds \| Significant Unobservable Inputs (Level 3)
Fair value measurements
Cash equivalents	0	0
Recurring basis \| U.S. treasury securities
Fair value measurements
Marketable securities	26,870	29,548
Recurring basis \| U.S. treasury securities \| Quoted Prices in Active Markets (Level 1)
Fair value measurements
Marketable securities	26,870	29,548
Recurring basis \| U.S. treasury securities \| Significant Other Observable Inputs (Level 2)
Fair value measurements
Marketable securities	0	0
Recurring basis \| U.S. treasury securities \| Significant Unobservable Inputs (Level 3)
Fair value measurements
Marketable securities	$ 0	0
Recurring basis \| U.S government agency securities
Fair value measurements
Cash equivalents		24,889
Marketable securities		4,975
Recurring basis \| U.S government agency securities \| Quoted Prices in Active Markets (Level 1)
Fair value measurements
Cash equivalents		24,889
Marketable securities		0
Recurring basis \| U.S government agency securities \| Significant Other Observable Inputs (Level 2)
Fair value measurements
Cash equivalents		0
Marketable securities		4,975
Recurring basis \| U.S government agency securities \| Significant Unobservable Inputs (Level 3)
Fair value measurements
Cash equivalents		0
Marketable securities		$ 0

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

+ Details

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: