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Income taxes - Current Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Abstract] |  |
Current period income tax | $ 51 | $ 34
Withholding tax | 319 | 1,537
Total current tax expense | 370 | 1,571
Origination and reversal of temporary differences | 1,834 | (13,227)
Adjustments for prior periods | (1,138) | (1,922)
Change in unrecognized deductible temporary differences | (696) | 15,149
Total deferred tax expense | 0 | 0
Total income tax expense | $ 370 | $ 1,571

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