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Liability Related to the Sale of Future Proceeds from Disposition of Subsidiary (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Liability Related To Sale Of Future Proceeds From Disposition Of Subsidiary Details Abstract    
Liabilities related to sale of future proceeds from disposition of subsidiaries - beginning balance $ 602,000  
Non-Cash other income recognized (92,000) $ (109,000)
Non-Cash interest expense recognized 28,000 $ 33,000
Liabilities related to sale of future proceeds from disposition of subsidiary - ending balance 538,000  
Less: unamortized transaction costs (3,000)  
Liability related to sale of future proceeds from disposition of subsidiary, net $ 535,000