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Summary of significant accounting policies - Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of significant accounting policies |  |  |  |
Federal statutory rate |  | 21.00% | 35.00% | 35.00%
Increase in income tax expense due to Tax Cuts and Jobs Act | $ 2.6 |  |  |
Increase in income tax expense due to Tax Cuts and Jobs Act (in dollars per share) | $ 0.35 |  |  |

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- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 per share. + References No definition available. + Details
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