Fair value of financial instruments (Details) - Recurring - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets at fair value	$ 87,606
Financial liabilities at fair value	5,599	$ 7,850
Amount of liability transferred into level 3	0	0
Amount of liability transferred out of level 3	0	0
Amount of liability transferred level 1 to level 2	0	0
Amount of liability transferred level 2 to level 1	0	0
Cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets at fair value	46,881
U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets at fair value	40,725
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets at fair value	42,673
Financial liabilities at fair value	0	0
Level 1 \| Cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets at fair value	42,673
Level 1 \| U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets at fair value	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets at fair value	44,933
Financial liabilities at fair value	0	0
Level 2 \| Cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets at fair value	4,208
Level 2 \| U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets at fair value	40,725
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial liabilities at fair value	5,599	7,850
Contingent consideration - Long term portion
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial liabilities at fair value	5,599	7,850
Contingent consideration - Long term portion \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial liabilities at fair value	0	0
Contingent consideration - Long term portion \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial liabilities at fair value	0	0
Contingent consideration - Long term portion \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial liabilities at fair value	$ 5,599	$ 7,850

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

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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+ References

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ 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
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Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

+ 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 (c)(3)
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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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