Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details)
£ in Thousands, AUD in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 14, 2013
shares
Jul. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2015
GBP (£)
Jun. 30, 2015
USD ($)
Jun. 30, 2015
GBP (£)
Nov. 04, 2015
USD ($)
Jun. 30, 2015
AUD
Sep. 30, 2011
USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Percent of interest in contingent payments                   52.00%
Accrued income taxes     $ 1,700,000 $ 1,700,000   $ 1,700,000        
Nautilus Purchase and Sale Agreement (PSA)                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Future contingent production payments payable                   $ 5,000,000
Sopak Collateral Agreement | Common Stock                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Number of shares available for purchase | shares 1,158,080                  
Sopak Collateral Agreement | Warrant                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Number of shares available for purchase | shares 543,478                  
Petrie Partners, LLC                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Contingent financial adviser fees     $ 0              
Contingent financial adviser fees, percentage of transaction     3.00%     3.00%     3.00%  
MI3 | Subsequent Event                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Contingent bonuses payable               $ 100,000    
NT/P82 Seismic Survey, Geotechnical Studies                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Estimated costs for other commitments | AUD                 AUD 500  
NT/P82 Seismic Survey, Drilling of Exploration Well                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Estimated costs for other commitments | AUD                 25,000  
NT/P82 Seismic Survey, Completion of Seismic Survey                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Estimated costs for other commitments | AUD                 AUD 16,000  
Engagement of RFC Ambrian as financial advisor for farmout of NT/P82                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Cash payment to financial adviser, payment one   $ 20,000                
Cash payments to financial adviser, payment two   80,000                
Contingent financial adviser fees   $ 250,000                
Contingent financial adviser fees, percentage of transaction   5.00%                
Magellan Petroleum UK (MPUK)                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Ownership percentage       50.00%            
Celtique Claim                    
Purchase Commitment, Excluding Long-term Commitment [Line Items]                    
Payment sought by plaintiff       $ 2,300,000 £ 1,500          
Percentage above base rate payment       5.00%            
Closing costs paid by plaintiff           $ 94,000 £ 60      
Capitalized costs related to petroleum license       $ 919,000