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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of options outstanding by exercise price range
Options Outstanding 
Range of Exercise Price  Number Outstanding and exercisable at 12/31/18   Weighted Average Remaining Contractual Life (years)   Weighted Average Exercise Price 
                
$ 0 -  $ 15.00   32,500    2.46   $14.95 
$ 15.01 -   $ 42.50   55,300    0.76   $40.62 
$ 42.51 -   $ 62.10   12,000    1.60   $59.60 
    99,800    1.41   $34.55 
Summary of assumptions used to value stock options granted to employees and directors
   For the year ended 
   December 31, 2018 
     
Annual dividend yield   - 
Expected life (years)   1.5 
Risk-free interest rate   2.19%
Expected volatility   71.12%
Summary of stock-based compensation expense
  Years ended December 31, 
   2018   2017 
(In thousands)        
Research and development  $-   $- 
Sales and marketing   6    50 
General and administrative   23    22 
Stock-based compensation expense  $29   $72
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of all stock option plans / warrant activity

 

   Options Outstanding 
           Weighted-     
           Average     
       Weighted-   Remaining     
       Average   Contractual   Aggregate 
   Number of   Exercise   Life   Intrinsic 
   Shares   Price   (in years)   Value 
Options outstanding – January 1, 2017   184,600   $43.90        $     - 
Options granted   -    -         - 
Options exercised   -    -         - 
Options cancelled or expired   (9,000)   82.10         - 
Options outstanding – December 31, 2017   175,600   $41.99    2.18    - 
Options granted   30,000    15.00         - 
Options exercised   -    -         - 
Options cancelled or expired   (105,800)   41.36         - 
Options outstanding and vested – December 31, 2018   99,800   $34.55    1.41   $-