Annual report pursuant to Section 13 and 15(d)

Basis of Presentation - Additional Information (Details)

v3.3.0.814
Basis of Presentation - Additional Information (Details)
 12 Months Ended
Jul. 10, 2015
Jun. 30, 2015
USD ($)
segment
shares
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Presentation and Significant Accounting Policies Information [Line Items]        
Number of operating segments | segment   3    
Net loss from operations   $ 30,296,000 $ 12,348,000  
Working capital   3,900,000 25,600,000  
Cash and cash equivalents   $ 1,051,000 16,422,000 $ 32,469,000
Accounts receivable collectability period   2 months    
Allowance for doubtful accounts receivable   $ 0 0  
Impairment of proved oil and gas properties   17,353,000 0  
Impairment of goodwill   674,000 0  
Goodwill   500,000 1,174,000 $ 2,174,000
Uncertain tax positions   $ 0 0  
Number of reportable segments | segment   3    
Shares issued upon conversion | shares   1    
Other long term assets   $ (1,045,000) $ (1,374,000)  
Adjustments for New Accounting Principle, Early Adoption        
Presentation and Significant Accounting Policies Information [Line Items]        
Other long term assets   50,000    
Notes payable   50,000    
Nautilus Poplar, LLC (NP)        
Presentation and Significant Accounting Policies Information [Line Items]        
Impairment of goodwill   700,000    
MPUK        
Presentation and Significant Accounting Policies Information [Line Items]        
Goodwill   200,000    
Magellan Petroleum Australia Limited (MPA)        
Presentation and Significant Accounting Policies Information [Line Items]        
Goodwill   $ 300,000    
Minimum        
Presentation and Significant Accounting Policies Information [Line Items]        
Useful lives of assets   3 years    
Maximum        
Presentation and Significant Accounting Policies Information [Line Items]        
Maturity period of cash equivalents   3 months    
Useful lives of assets   15 years    
Utah CO2 LLC        
Presentation and Significant Accounting Policies Information [Line Items]        
Majority interest percentage   51.00%    
Central Petroleum Limited        
Presentation and Significant Accounting Policies Information [Line Items]        
Ownership percentage   11.00%    
Two separate third parties | Utah CO2 LLC        
Presentation and Significant Accounting Policies Information [Line Items]        
Ownership percentage   49.00%    
Third party owner | Utah CO2 LLC        
Presentation and Significant Accounting Policies Information [Line Items]        
Ownership percentage   10.00%    
Subsequent Event        
Presentation and Significant Accounting Policies Information [Line Items]        
Reverse stock split 0.125