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Fair value of financial instruments and investments - Convertible Senior Notes (Details) - 3.00% Convertible senior notes due 2022 - Convertible debt - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 31, 2015
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Financial assets and liabilities measured at fair value on recurring basis |  |  |
Principal | $ 150,000,000 | $ 150,000,000 | $ 150,000,000
Interest rate |  |  | 3.00%
Debt instrument | $ 115,700,000 | $ 85,200,000 |

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