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Income taxes (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]            
Valuation allowance $ 87,000     $ 87,000   $ 86,000
Unrecognized tax benefits 6,800     6,800   $ 6,700
Gross increase in unrecognized tax benefits, current period 31          
Reasonable possibility of future tax benefits 2,900     2,900    
Accrued interest related to uncertain tax positions $ 800     $ 800    
Effective income tax rate 29.00%   13.00% 24.00% 12.00%  
U.S. federal statutory rate 21.00%   21.00%   21.00%  
Hungary statutory tax rate       9.00%    
Income tax benefit of tax holiday (in usd per share)   $ 0.01        
Hungary            
Operating Loss Carryforwards [Line Items]            
Foreign income tax benefit $ 300   $ 1,600 $ 100 $ 2,600  
Malaysia            
Operating Loss Carryforwards [Line Items]            
Income tax benefit of tax holiday, amount $ 100   $ 800 $ 300 $ 1,300