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Liability Related to the Sale of Future Proceeds from Disposition of Subsidiary (Tables)
 6 Months Ended
Jun. 30, 2021
Liability Related To Sale Of Future Proceeds From Disposition Of Subsidiary [Abstract]  
Schedule of activity within the liability account
   June 30,
2021		  

December 31,
2020

 
   (Unaudited)     
Liabilities related to sale of future proceeds from disposition of        
subsidiaries - beginning balance  $322,000   $602,000 
Non-Cash other income recognized   (195,000)   (402,000)
Non-Cash interest expense recognized   58,000    122,000 
Liabilities related to sale of future proceeds from disposition of          
subsidiary - ending balance   185,000    322,000 
Less: unamortized transaction costs   (3,000)   (3,000)
Liability related to sale of future proceeds from disposition of          
subsidiary, net  $182,000   $319,000