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Fair value of financial instruments and investments - Marketable Securities, Balance Sheet Disclosures (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, Less Than 12 Months | $ 86,892 | $ 221,611
Marketable securities, More Than 12 Months | 68,081 | 155,074
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, Less Than 12 Months |  | 75,279
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, Less Than 12 Months | 86,892 | 131,606
Marketable securities, More Than 12 Months | 62,396 | 136,077
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, Less Than 12 Months |  | 8,724
Marketable securities, More Than 12 Months |  | 6,574
Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, Less Than 12 Months |  | 6,002
Marketable securities, More Than 12 Months | $ 5,685 | $ 12,423

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123599081&loc=SL120269850-112803 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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