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SUBSEQUENT EVENTS - Third PSC Amendment and Presidential Decree (Details)
9 Months Ended
May 20, 2017
USD ($)
Apr. 12, 2017
USD ($)
km²
Mar. 01, 2017
USD ($)
Jan. 24, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 30, 2017
Sep. 15, 2016
km²
Aug. 19, 2016
km²
Jun. 30, 2016
Guinea concession                  
SUBSEQUENT EVENTS                  
Contract area retained (in square kilometers/square miles) | km²             5,000 5,000  
Mutually acceptable security     $ 5,000,000 $ 5,000,000 $ 5,000,000        
Ownership interest (as a percent)             100.00%   37.00%
Farm-out Agreement | Guinea concession | Subsequent Event                  
SUBSEQUENT EVENTS                  
Contract area retained (in square kilometers/square miles) | km²   5,000              
Mutually acceptable security   $ 5,000,000              
Maximum days for security instrument to put in place   30 days              
Farm-out Agreement | SAPETRO                  
SUBSEQUENT EVENTS                  
Ownership interest sold (as a percent)           50.00%      
Farm-out Agreement | SAPETRO | Guinea concession                  
SUBSEQUENT EVENTS                  
Ownership interest sold (as a percent)           50.00%      
Sufficient financing for the Obligation Well Cost   $ 15,000,000              
Farm-out Agreement | SAPETRO | Guinea concession | Subsequent Event                  
SUBSEQUENT EVENTS                  
Ownership interest sold (as a percent)   50.00%              
Contract area retained (in square kilometers/square miles) | km²   5,000              
Mutually acceptable security   $ 5,000,000              
Maximum days for security instrument to put in place   30 days              
Sufficient financing for the Obligation Well Cost   $ 15,000,000              
Ownership interest (as a percent)   2.00%              
Threshold amount for additional assigned 2% participating interest   $ 1,000,000              
Offshore Drilling Contract | Subsidiary of Pacific Operations Drilling Limited | Subsequent Event                  
SUBSEQUENT EVENTS                  
Mobilization and Standby Rate ("SMSR") per day $ 100,000                
Notice for drilling commencement (in days) 28 days                
Value of common stock issuable $ 1,000,000                
Average market price (in days) 10 days