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Shareholders' equity (Details)
€ / shares in Units, $ / shares in Units, $ in Thousands, € in Millions
 12 Months Ended
Apr. 15, 2015
USD ($)
$ / shares
shares
Feb. 05, 2014
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
EUR (€)
item
€ / shares
shares
Dec. 31, 2016
USD ($)
item
shares
Dec. 31, 2015
€ / shares
Dec. 31, 2015
USD ($)
shares
Shareholders' equity                
Authorized share capital         € 3.0 $ 3,200    
Exchange rate (in USD per Euro)         1.05204 1.05204    
Authorized share capital (in shares) | shares         60,000,000 60,000,000   60,000,000
Par value of common stock ( in dollars per share) | € / shares         € 0.05   € 0.05  
Number of classes of ordinary shares | item         1 1    
Reserves for foreign currency translation effects | $       $ 5,300   $ 6,600   $ 6,800
Shares issued (in shares) | shares 3,000,000 5,400,000            
Price of shares issued (in dollars per share) | $ / shares $ 29.50 $ 17.00            
Proceeds from issuance initial public offering | $ $ 82,500 $ 84,500 $ 82,519 $ 84,462