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Selling Arrangement (Tables)
12 Months Ended
Dec. 31, 2016
Selling Arrangement  
Summary of the Carrying Amount of the Selling Arrangement
    2016     2015  
Gross cost   $ 4,000,000     $ 4,000,000  
Accumulated amortization     (2,283,000 )     (1,883,000 )
Net carrying amount   $ 1,717,000     $ 2,117,000