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Principal Business Activity and Significant Accounting Policies - Others (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Research and Development and Advertising Costs          
Research and development costs $ 185 $ 33 $ 352 $ 131  
Advertising costs 1,821 $ 532 3,498 $ 2,545  
Collaboration Agreements          
Collaboration agreements, contingent payments to be made $ 20,800   $ 20,800    
Continuing LLC Owners          
Non-Controlling Interests          
Interest held by non-controlling owners 17.50%   17.50%   23.20%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-09-30          
Revenue Recognition          
Period of satisfaction of performance obligation 1 year   1 year