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Fair value of financial instruments and investments - Marketable Securities, Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Marketable securities, Less Than 12 Months	$ 221,611	$ 588,863
Marketable securities, More Than 12 Months	155,074	305,975
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Marketable securities, Less Than 12 Months	75,279	276,837
Marketable securities, More Than 12 Months	0
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, Less Than 12 Months	131,606	240,139
Marketable securities, More Than 12 Months	136,077	235,520
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, Less Than 12 Months	8,724	6,363
Marketable securities, More Than 12 Months	6,574	22,525
Government obligations
Debt Securities, Available-for-sale [Line Items]
Marketable securities, Less Than 12 Months	6,002	65,524
Marketable securities, More Than 12 Months	$ 12,423	$ 47,930

X

- Definition

Amount of available-for-sale debt securities at fair value maturing after the next fiscal year following the latest fiscal year.

+ References

No definition available.

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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

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- 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

No definition available.

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