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Investment in Eton Pharmaceuticals, Inc. and Agreements - Related Party Transactions - Schedule of Condensed Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Current assets $ 11,684 $ 8,806
Total assets 28,289 23,917
Total liabilities 23,836 21,302
Total liabilities and stockholders' equity 28,289 $ 23,917
Eton Pharmaceuticals, Inc. [Member]    
Current assets 6,803  
Non current assets 722  
Total assets 7,525  
Total liabilities 1,193  
Total preferred stock and stockholders' equity 6,332  
Total liabilities and stockholders' equity $ 7,525