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Commitments and Contingencies - Retailer Agreements (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies    
Fixed and store-based payments $ 3,661,000 $ 2,585,000
Aggregate commitment amounts under agreements with retailers    
2016 3,101,000  
2017 1,716,000  
2018 $ 246,000