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Expenses by nature - Employee benefit expenses (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
employee
Dec. 31, 2015
USD ($)
employee
Dec. 31, 2014
USD ($)
employee
Employee-related expenses      
Wages and salaries $ 24,999 $ 19,274 $ 15,640
Social security costs 1,824 1,440 1,257
Health insurance 1,099 828 348
Pension costs - defined contribution plans 1,088 608 804
Share-based compensation expenses 5,544 5,188 4,309
Consultant expenses 5,873 3,037 5,053
Other employee expenses 1,833 1,023 274
Total $ 42,260 $ 31,398 $ 27,685
Number of employees at the end of the period | employee 251 198 162