Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations (Details)

v3.6.0.2
Discontinued Operations (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2016
Dec. 31, 2016
Aug. 11, 2016
Aug. 01, 2016
Jun. 30, 2016
Sep. 30, 2011
Nautilus Purchase and Sale Agreement (PSA)            
Debt Instrument [Line Items]            
Future contingent production payments payable           $ 5,000
Discontinued Operations, Held-for-sale            
Debt Instrument [Line Items]            
Cash     $ 0   $ 141  
Series A Preferred Stock            
Debt Instrument [Line Items]            
Percent of shares transferred 100.00%          
CO2 Business            
Debt Instrument [Line Items]            
Ownership percentage, sold in period 100.00%          
CO2 Business | Discontinued Operations, Held-for-sale            
Debt Instrument [Line Items]            
Cash       $ 0 141  
Collateral   $ 150        
One Stone | One Stone Exchange Agreement | Investor            
Debt Instrument [Line Items]            
Transaction costs   968     $ 690  
Transaction costs   $ 278        
One Stone | One Stone Exchange Agreement | Series A Preferred Stock            
Debt Instrument [Line Items]            
Percent of shares transferred 100.00%          
One Stone | One Stone Exchange Agreement | Nautilus Poplar, LLC (NP)            
Debt Instrument [Line Items]            
Ownership percentage, sold in period 100.00%