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Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disclosure Of Compensation Related Costs Share based Payments [Line Items]            
Allocated Share-based Compensation Expense   $ 40,000 $ (97,000) $ 122,000 $ 165,000  
Derivative Liability $ 180,000          
Fair Value Adjustment of Warrants $ 180,000          
Adjustments to Additional Paid in Capital, Warrant Issued       91,000    
HlhwIv Llc [Member]            
Disclosure Of Compensation Related Costs Share based Payments [Line Items]            
Adjustments to Additional Paid in Capital, Warrant Issued           $ 180,000
Employee Stock Option [Member]            
Disclosure Of Compensation Related Costs Share based Payments [Line Items]            
Allocated Share-based Compensation Expense       $ 200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       1 year 6 months    
Series E Convertible Preferred Stock [Member]            
Disclosure Of Compensation Related Costs Share based Payments [Line Items]            
Conversion of Stock, Shares Converted       7,699    
Dividends       $ 251,000    
Common Stock [Member]            
Disclosure Of Compensation Related Costs Share based Payments [Line Items]            
Conversion of Stock, Shares Issued       14,634,268    
Adjustments to Additional Paid in Capital, Warrant Issued       $ 0    
Warrant [Member]            
Disclosure Of Compensation Related Costs Share based Payments [Line Items]            
Class Of Warrant Or Right Issued 83,333