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Fair value of financial instruments and marketable securities - Marketable securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | $ 450,923 | $ 588,863
Total Marketable securities, More Than 12 Months | 191,154 | 305,975
Commercial paper |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 252,802 | 276,837
Corporate debt securities |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 164,640 | 240,139
Total Marketable securities, More Than 12 Months | 166,593 | 235,520
Asset-backed securities |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 5,321 | 6,363
Total Marketable securities, More Than 12 Months | 13,999 | 22,525
Government obligations |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 28,160 | 65,524
Total Marketable securities, More Than 12 Months | $ 10,562 | $ 47,930

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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=120252992&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=121645371&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=121645371&loc=d3e27161-111563 + Details
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