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Fair value of financial instruments and investments - Available-for-sale securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months - Unrealized losses | $ (3,361) | $ (673)
Securities in an unrealized loss position less than 12 months - Fair Value | 139,228 | 256,801
Securities in an unrealized loss position greater than 12 months - Unrealized losses | (310) | (36)
Securities in an unrealized loss position greater than 12 months - Fair Value | 10,745 | 4,985
Total - Unrealized losses | (3,671) | (709)
Total - Fair Value | 149,973 | 261,786
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months - Unrealized losses |  | (1)
Securities in an unrealized loss position less than 12 months - Fair Value |  | 12,992
Total - Unrealized losses |  | (1)
Total - Fair Value |  | 12,992
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months - Unrealized losses | (3,173) | (608)
Securities in an unrealized loss position less than 12 months - Fair Value | 133,542 | 217,540
Securities in an unrealized loss position greater than 12 months - Unrealized losses | (310) | (36)
Securities in an unrealized loss position greater than 12 months - Fair Value | 10,745 | 4,985
Total - Unrealized losses | (3,483) | (644)
Total - Fair Value | 144,287 | 222,525
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months - Unrealized losses |  | (5)
Securities in an unrealized loss position less than 12 months - Fair Value |  | 10,786
Total - Unrealized losses |  | (5)
Total - Fair Value |  | 10,786
Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months - Unrealized losses | (188) | (59)
Securities in an unrealized loss position less than 12 months - Fair Value | 5,686 | 15,483
Total - Unrealized losses | (188) | (59)
Total - Fair Value | $ 5,686 | $ 15,483

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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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