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Fair value of financial instruments and investments - Available-for-sale securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months - Unrealized losses | $ (673) | $ (75)
Securities in an unrealized loss position less than 12 months - Fair Value | 256,801 | 260,970
Securities in an unrealized loss position greater than 12 months - Unrealized losses | (36) |
Securities in an unrealized loss position greater than 12 months - Fair Value | 4,985 |
Total - Unrealized losses | (709) | (75)
Total - Fair Value | 261,786 | 260,970
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months - Unrealized losses | (1) | (37)
Securities in an unrealized loss position less than 12 months - Fair Value | 12,992 | 129,630
Total - Unrealized losses | (1) | (37)
Total - Fair Value | 12,992 | 129,630
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months - Unrealized losses | (608) | (29)
Securities in an unrealized loss position less than 12 months - Fair Value | 217,540 | 102,426
Securities in an unrealized loss position greater than 12 months - Unrealized losses | (36) |
Securities in an unrealized loss position greater than 12 months - Fair Value | 4,985 |
Total - Unrealized losses | (644) | (29)
Total - Fair Value | 222,525 | 102,426
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months - Unrealized losses | (5) | (3)
Securities in an unrealized loss position less than 12 months - Fair Value | 10,786 | 1,830
Total - Unrealized losses | (5) | (3)
Total - Fair Value | 10,786 | 1,830
Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months - Unrealized losses | (59) | (6)
Securities in an unrealized loss position less than 12 months - Fair Value | 15,483 | 27,084
Total - Unrealized losses | (59) | (6)
Total - Fair Value | $ 15,483 | $ 27,084

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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