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ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Status of Our Business - Liquidity and Going Concern (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 05, 2017
USD ($)
$ / shares
shares
May 21, 2017
USD ($)
Apr. 26, 2017
USD ($)
$ / shares
Apr. 26, 2017
$ / shares
shares
Apr. 18, 2017
$ / shares
shares
Apr. 12, 2017
USD ($)
km²
Mar. 30, 2017
USD ($)
Mar. 28, 2017
USD ($)
$ / shares
shares
Mar. 17, 2017
USD ($)
shares
Mar. 01, 2017
USD ($)
Jan. 29, 2017
USD ($)
Jan. 24, 2017
USD ($)
Sep. 15, 2016
USD ($)
km²
item
m
Aug. 19, 2016
USD ($)
km²
m
Aug. 15, 2016
USD ($)
Mar. 25, 2010
mi²
m
Jun. 30, 2017
USD ($)
item
$ / shares
shares
Mar. 31, 2017
USD ($)
m
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Jun. 02, 2017
Jun. 30, 2015
$ / shares
Dec. 31, 2012
Dec. 30, 2012
Dec. 27, 2012
Jun. 30, 2010
Mar. 25, 2010
km²
Status of our Business                                                    
Stated value per share | $ / shares                                   $ 0.001 $ 0.001   $ 0.001          
Exercise price (in dollars per share) | $ / shares                                         $ 12.64          
Payments of Stock Issuance Costs                                   $ 210,000                
Private Placement Offering | Subsequent Event                                                    
Status of our Business                                                    
Number of shares each warrant can purchase | shares 0.75                                                  
Exercise price (in dollars per share) | $ / shares $ 1.825                                                  
Aggregate shares of common stock issued | shares 4,335,625                                                  
Series A Preferred Stock | Private Placement Offering                                                    
Status of our Business                                                    
Stated value per share | $ / shares               $ 0.001                                    
Exercise price (in dollars per share) | $ / shares               $ 3.50                                    
Aggregate shares of common stock issued | shares               511 680                                  
Series A Preferred Stock | Private Placement Offering | Subsequent Event                                                    
Status of our Business                                                    
Number Of Closings Of A Private Placement Offering | item                                 4                  
Aggregate number of units issued | shares                                 1,951                  
Purchase price per unit | $ / shares                                 $ 1,000                  
Stated value per share | $ / shares     $ 0.001 $ 0.001 $ 0.001                       $ 1,040                  
Number of shares each warrant can purchase | shares                                 223                  
Exercise price (in dollars per share) | $ / shares                                 $ 3.50                  
Aggregate cash proceeds from sale of units     $ 760,000                           $ 1,951,000                  
Aggregate shares of common stock issued | shares       50 710                       435,073                  
Tullow and Dana                                                    
Status of our Business                                                    
Minimum ultra deepwater depth (in meters) | m                                   2,000                
Tullow and Dana | Settlement Agreement                                                    
Status of our Business                                                    
Ownership interest (as a percent)                             100.00%                      
Settlement amount                             $ 700,000                      
Tullow and Dana | Settlement Agreement | Subsequent Event                                                    
Status of our Business                                                    
Ownership interest (as a percent)                             100.00%                      
SAPETRO | Farm-out Agreement                                                    
Status of our Business                                                    
Ownership interest sold (as a percent)             50.00%                                      
SAPETRO | Farm-out Agreement | Subsequent Event                                                    
Status of our Business                                                    
Participation interest in joint venture                                       50.00%            
Subsidiary of Pacific Operations Drilling Limited | Offshore Drilling Contract | Subsequent Event                                                    
Status of our Business                                                    
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                                                
Placement Agent | Private Placement Offering | Subsequent Event                                                    
Status of our Business                                                    
Aggregate cash proceeds from sale of units $ 6,330,000                                                  
Payments of Stock Issuance Costs $ 569,700                                                  
Placement Agent | Series A Preferred Stock | Private Placement Offering                                                    
Status of our Business                                                    
Number of shares each warrant can purchase | shares               13,528                                    
Payments of Stock Issuance Costs               $ 45,990 $ 61,200                                  
Placement Agent | Series A Preferred Stock | Private Placement Offering | Subsequent Event                                                    
Status of our Business                                                    
Aggregate shares of common stock issued | shares                                 51,650                  
Payments of Stock Issuance Costs     $ 68,400                           $ 175,555                  
Guinea concession                                                    
Status of our Business                                                    
Ownership interest (as a percent)                         100.00%           37.00%     37.00% 77.00%      
Cash proceeds from Tullow                                   $ 26,000,000                
Gross expenditure cap                                   100,000,000 $ 100,000,000              
Threshold gross expenditure cap for well to be paid by the entity                                   100,000,000 $ 100,000,000              
Extension period for second exploration (in years)                         1 year                          
Number of exploratory wells drilled | item                         1                          
Depth below seabed required to be drilled of an exploration well (in meters) | m                         2,500 2,500                        
Contract area retained (in square kilometers/square miles)                         5,000 5,000   9,650                   25,000
Maximum period of time over which current available liquidity could be exhausted                         30 days           12 months              
Estimated amount to limit cost recovery to share of expenditures                           $ 165,000,000                        
Total value of oil and gas equipment stored at Takoradi, Ghana                     $ 4,100,000   $ 4,100,000                          
Portion of oil and gas equipment moved from Takoradi, Ghana to Guinea                     $ 1,600,000   1,600,000                          
Agreed amount in training budget                         250,000 250,000                        
Estimated amount of unused portion of training program                           $ 400,000       400,000                
Mutually acceptable security                   $ 5,000,000   $ 5,000,000           $ 5,000,000                
Guinea concession | Subsequent Event                                                    
Status of our Business                                                    
Ownership interest (as a percent)                           100.00%                        
Extension period for second exploration (in years)                           1 year                        
Depth below seabed required to be drilled of an exploration well (in meters) | m                           2,500                        
Contract area retained (in square kilometers/square miles) | km²                           5,000                        
Estimated amount to limit cost recovery to share of expenditures                           $ 150,000,000                        
Agreed amount in training budget                           250,000                        
Estimated amount of unused portion of training program                           500,000                        
Mutually acceptable security                           $ 5,000,000                        
Guinea concession | Minimum                                                    
Status of our Business                                                    
Depth below seabed required to be drilled of an exploration well (in meters) | m                               2,500                    
Guinea concession | Settlement Agreement                                                    
Status of our Business                                                    
Estimated amount to limit cost recovery to share of expenditures                         $ 165,000,000                          
Guinea concession | Farm-out Agreement | Subsequent Event                                                    
Status of our Business                                                    
Contract area retained (in square kilometers/square miles) | km²           5,000                                        
Mutually acceptable security           $ 5,000,000                                        
Maximum Day For Security Instrument To Put In Place           30 days                                        
Guinea concession | Tullow Guinea Ltd                                                    
Status of our Business                                                    
Ownership interest sold (as a percent)                                           40.00%   40.00%    
Guinea concession | SAPETRO | Farm-out Agreement                                                    
Status of our Business                                                    
Ownership interest sold (as a percent)             50.00%                                      
Sufficient financing for the Obligation Well Cost           $ 15,000,000                                        
Guinea concession | SAPETRO | Farm-out Agreement | Subsequent Event                                                    
Status of our Business                                                    
Ownership interest (as a percent)           2.00%                                        
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                                        
Participation interest in joint venture           50.00%                                        
Maximum Day For Security Instrument To Put In Place           30 days                                        
Sufficient financing for the Obligation Well Cost           $ 15,000,000                                        
Threshold amount for additional assigned 2% participating interest           $ 1,000,000                                        
Guinea concession | SAPETRO | Farm-out Agreement | Maximum                                                    
Status of our Business                                                    
Estimated total drilling preparation cost             $ 10,000,000                                      
Guinea concession | SAPETRO | Farm-out Agreement | Minimum                                                    
Status of our Business                                                    
Estimated total drilling preparation cost             $ 8,000,000                                      
Guinea concession | Dana                                                    
Status of our Business                                                    
Ownership interest (as a percent)                                     23.00%           23.00%  
Guinea concession | Tullow Guinea Ltd                                                    
Status of our Business                                                    
Ownership interest (as a percent)                                     40.00%     40.00%