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Fair value of financial instruments and marketable securities (Details 3) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 31, 2015
--- | --- | --- | ---
Marketable securities on the balance sheet |  |  |
Less Than 12 Months | $ 157,352,000 | $ 186,782,000 |
More Than 12 Months | 15,993,000 | 94,121,000 |
Commercial paper |  |  |
Marketable securities on the balance sheet |  |  |
Less Than 12 Months | 12,966,000 | 26,957,000 |
More Than 12 Months | 0 | 0 |
Corporate debt securities |  |  |
Marketable securities on the balance sheet |  |  |
Less Than 12 Months | 137,196,000 | 140,831,000 |
More Than 12 Months | 15,993,000 | 85,488,000 |
Government obligations |  |  |
Marketable securities on the balance sheet |  |  |
Less Than 12 Months | 7,190,000 | 18,994,000 |
More Than 12 Months | 0 | 8,633,000 |
3.00% Convertible senior notes due 2022 | Convertible debt |  |  |
Marketable securities on the balance sheet |  |  |
Principal | 150,000,000 | $ 150,000,000 | $ 150,000,000
Interest rate |  |  | 3.00%
Debt instrument | $ 85,200,000 |  |

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