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Principal Business Activity and Significant Accounting Policies - Others (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair Value of Financial Instruments      
Fixed interest rate 4.35%    
Revenue Recognition      
Period of satisfaction of performance obligation 1 year    
Research and Development and Advertising Costs      
Research and development costs $ 49 $ 195  
Advertising costs $ 594 $ 458  
Non-Controlling Interests      
Interest held by non-controlling owners 37.20%   38.50%
Contingent notes      
Fair Value of Financial Instruments      
Fixed interest rate 6.75%    
Other accrued expenses      
Deferred Acquisition Liability      
Current portion of deferred acquisition liability $ 1,622   $ 1,575
Recurring | Contingent notes      
Fair Value of Financial Instruments      
Contingent notes $ 9,641