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Fair value of financial instruments and marketable securities - Marketable securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | $ 161,132 | $ 58,088
Total Marketable securities, More Than 12 Months | 66,315 | 0
Commercial paper |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 70,301 | 31,699
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 | 70,192 | 26,389
Total Marketable securities, More Than 12 Months | 59,514 | $ 0
Asset-backed securities |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 20,639 |
Total Marketable securities, More Than 12 Months | $ 6,801 |

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