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Liability Related to the Sale of Future Proceeds from Disposition of Subsidiary (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Placement Agency Agreement [Member]        
Liabilities related to sale of future proceeds from disposition of subsidiaries - beginning balance     $ 603,000  
Non-Cash other income recognized     (211,000)  
Non-Cash interest expense recognized $ 36,000 $ 0 64,000 $ 33,000
Liabilities related to sale of future proceeds from disposition of subsidiary - ending balance $ 456,000   456,000  
Less: unamortized transaction costs     (3,000)  
Liability related to sale of future proceeds from disposition of subsidiary, net     $ 453,000