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Related Party Transactions (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Ownership percentage   50.00%  
Chairman | Legal Services      
Related Party Transaction [Line Items]      
Legal fees $ 240,000 $ 227,000 $ 228,000
Amounts due to firm $ 113,000 88,000  
Chief Financial Officer | Social Media and Investor Related Services      
Related Party Transaction [Line Items]      
Amounts due to firm   0 4,000
Social media and investor related fees   $ 22,000 $ 80,000