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Fair value of financial instruments and marketable securities - Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | $ 163,941 | $ 186,782
Total Marketable securities, More Than 12 Months | 34,111 | 94,121
Commercial paper |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 17,988 | 26,957
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 | 132,009 | 140,831
Total Marketable securities, More Than 12 Months | 34,111 | 85,488
Government obligations |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 13,944 | 18,994
Total Marketable securities, More Than 12 Months | $ 0 | $ 8,633

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