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Income taxes - Current Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
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