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Fair value of financial instruments and marketable securities - Marketable securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | $ 255,587 | $ 342,418
Total Marketable securities, More Than 12 Months | 84,843 | 56,117
Commercial paper |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 53,816 | 158,098
Total Marketable securities, More Than 12 Months | 0 | 0
Corporate debt securities |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 168,250 | 139,596
Total Marketable securities, More Than 12 Months | 55,700 | 49,738
Asset-backed securities |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 26,320 | 44,724
Total Marketable securities, More Than 12 Months | 18,503 | $ 6,379
Government obligations |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 7,201 |
Total Marketable securities, More Than 12 Months | $ 10,640 |

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