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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2015
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents   $ 4,614 $ 2,016  
Restricted cash held at EMLLC   3,388 6,167  
Restricted cash and investments held for reclamation bonds     434  
Total cash, cash equivalents and restricted cash shown in the statement of cash flows   8,002 8,617 $ 17,974
Cash deposits   708 834  
POS-Minerals Corporation        
Contributions made by EMLLC to its members $ 700      
Mt. Hope Project        
Restricted cash held at EMLLC   3,400 6,200  
Cash deposits   600    
Initial Fund From Members Reserve Account Balance   3,400 6,200  
Liberty Project        
Cash deposits   100    
Eureka Moly LLC        
Additional in long term funding mechanism   400 $ 400  
Cash deposits   $ 600    
Nevada Moly LLC        
Contributions made by EMLLC to its members $ 2,700