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Stockholders' Equity - Stock Options (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 15, 2020
Apr. 01, 2020
Mar. 31, 2020
Mar. 13, 2020
Feb. 28, 2020
Jan. 31, 2020
Jan. 01, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Number of Options                        
Outstanding, beginning balance (in shares)             7,222,625     7,222,625    
Granted (in shares)                   443,500    
Canceled (in shares)                   0    
Exercised (in shares)                   0    
Expired/Forfeited (in shares)                   (126,000)    
Outstanding, ending balance (in shares)               7,540,125   7,540,125   7,222,625
Exercisable (in shares)               2,939,625   2,939,625    
Weighted Average Exercise Price                        
Outstanding, beginning balance (in dollars per share)             $ 3.33     $ 3.33    
Granted (in dollars per share)                   1.47    
Canceled (in dollars per share)                   0.00    
Exercised (in dollars per share)                   0.00    
Expired/Forfeited (in dollars per share)                   1.81    
Outstanding, ending balance (in dollars per share)               $ 3.32   3.32   $ 3.33
Exercisable (in dollars per share)               $ 5.04   $ 5.04    
Other disclosures                        
Outstanding Weighted Average Remaining Contractual Life (in Years)                   5 years 3 months 22 days   5 years 9 months 26 days
Exercisable Weighted Average Remaining Contractual Life (in Years)                   1 year 7 months 13 days    
Aggregate Intrinsic Value, Outstanding               $ 0   $ 0   $ 0
Aggregate Intrinsic Value, Exercisable               0   $ 0    
Board Observer                        
Number of Options                        
Granted (in shares)             5,000          
Weighted Average Exercise Price                        
Granted (in dollars per share)             $ 4.00          
Other disclosures                        
Vesting percentage per year             50.00%          
Consultant                        
Number of Options                        
Granted (in shares) 13,500         75,000            
Weighted Average Exercise Price                        
Granted (in dollars per share) $ 3.00         $ 1.57            
Other disclosures                        
Awards that vested (as a percent)                   33.33%    
Vesting percentage per year 33.33%                      
Employee                        
Number of Options                        
Granted (in shares)     50,000   50,000              
Weighted Average Exercise Price                        
Granted (in dollars per share)     $ 0.61   $ 1.40              
Other disclosures                        
Vesting percentage per year     33.33%                  
A certain key employee                        
Number of Options                        
Granted (in shares)       50,000                
Weighted Average Exercise Price                        
Granted (in dollars per share)       $ 5.50                
Non Management Directors                        
Number of Options                        
Granted (in shares)   200,000                    
Weighted Average Exercise Price                        
Granted (in dollars per share)   $ 0.50                    
Other disclosures                        
Vesting percentage per year   50.00%                    
Employee Stock Option                        
Number of Options                        
Granted (in shares)                   443,500    
Employee Stock Option                        
Other disclosures                        
Compensation expense               45,000 $ 73,000 $ 113,000 $ 316,000  
Unrecognized compensation expense               $ 250,000   $ 250,000    
Weighted average period of recognition                   1 year 6 months    
Employee Stock Option | Five year expiration                        
Stockholders’ Equity                        
Expiration period                   5 years    
Employee Stock Option | Seven year expiration                        
Stockholders’ Equity                        
Expiration period                   7 years    
Employee Stock Option | Ten year expiration                        
Stockholders’ Equity                        
Expiration period                   10 years