Principal Business Activity and Significant Accounting Policies - Others (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 20, 2017
Deferred Acquisition Liability
Current portion of deferred acquisition liability	$ 1,575	$ 250
Non current portion of deferred acquisition liability		1,303
Research and Development and Advertising Costs
Research and development costs	514	310	$ 380
Advertising costs	2,229	1,179	6,077
Interest Expense [Abstract]
Interest Expense	163	3,078	3,567
Interest and Other Income	$ 75	20	$ 22
Non-Controlling Interests
Interest held by parent	61.50%			61.50%
Interest held by non-controlling owners	38.50%			38.50%
Other accrued expenses
Deferred Acquisition Liability
Current portion of deferred acquisition liability	$ 1,575	250
Deferred acquisition liability
Deferred Acquisition Liability
Non current portion of deferred acquisition liability	$ 0	$ 1,303