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Commitments and Contingencies - Retailer Agreements (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]    
Fixed and store-based payments $ 5,376,000 $ 3,661,000
Aggregate commitment amounts under agreements with retailers    
2017 3,865,000  
2018 1,526,000  
2019 $ 14,000