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Fair value of financial instruments and marketable securities - Marketable securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | $ 42,491 | $ 69,377
Total Marketable securities, More Than 12 Months | 0 | 10,077
Commercial paper |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 18,435 | 13,827
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 | 24,056 | 55,550
Total Marketable securities, More Than 12 Months | $ 0 | $ 10,077

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