v3.8.0.1
Other (Expenses) Income - Summary of Other (Expenses) Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]      
Income tax expense $ (7,511) $ (3,406) $ (1,977)
Foreign exchange gain 1,413 613 (292)
Other income 120 50 167
Total (5,978) (2,743) 1,318
Warrant [Member]      
Income Tax Contingency [Line Items]      
Gain on initial recognition of stock purchase warrant $ 0 $ 0 $ 3,420