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Investment in Eton Pharmaceuticals, Inc. and Agreements - Related Party Transactions (Details Narrative) - Eton Pharmaceuticals, Inc. [Member]
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Number of shares owned | shares 3,500,000 3,500,000
Ownership percentage 27.00% 27.00%
Investment net loss $ 1,032 $ 3,247
Carrying value of investment $ 263 $ 263