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Income taxes - Schedule of Deferred Tax Assets and Liabilities Within the Same Jurisdiction (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets | $ 56 | $ 245
Deferred tax liabilities | 20,217 | 21,341
Net deferred tax liabilities | $ 20,161 | $ 21,096

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