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Fair value of financial instruments and investments - Available-for-sale securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months | $ (75) | $ (28)
Fair Value | 260,970 | 95,990
Securities in an unrealized loss position greater than 12 months | 0 | 0
Fair Value | 0 | 0
Total | (75) | (28)
Fair Value | 260,970 | 95,990
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months | (37) |
Fair Value | 129,630 |
Securities in an unrealized loss position greater than 12 months | 0 |
Fair Value | 0 |
Total | (37) |
Fair Value | 129,630 |
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months | (29) | (20)
Fair Value | 102,426 | 71,779
Securities in an unrealized loss position greater than 12 months | 0 | 0
Fair Value | 0 | 0
Total | (29) | (20)
Fair Value | 102,426 | 71,779
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months | (3) | (8)
Fair Value | 1,830 | 24,211
Securities in an unrealized loss position greater than 12 months | 0 | 0
Fair Value | 0 | 0
Total | (3) | (8)
Fair Value | 1,830 | $ 24,211
Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities in an unrealized loss position less than 12 months | (6) |
Fair Value | 27,084 |
Securities in an unrealized loss position greater than 12 months | 0 |
Fair Value | 0 |
Total | (6) |
Fair Value | $ 27,084 |

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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=121645371&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=121582814&loc=SL82922890-210455 + Details
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