Annual report pursuant to Section 13 and 15(d)

Income taxes - Change in Valuation Allowance (Details)

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Income taxes - Change in Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Valuation allowance, beginning $ 40,776  
Impact of adopting ASC 606   $ (1,469)
Increase in valuation allowance 16,961 16,659
Foreign currency translation adjustments 1,435 (1,847)
Valuation allowance, ending 59,172 40,776
Previously Reported    
Valuation allowance, beginning 40,776 27,433
Valuation allowance, ending   40,776
Restatement Adjustment    
Valuation allowance, beginning $ 40,776 25,964
Valuation allowance, ending   $ 40,776