Annual report pursuant to Section 13 and 15(d)

Liquidity And Going Concern (Details)

v3.3.1.900
Liquidity And Going Concern (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 14, 2016
USD ($)
Dec. 31, 2015
USD ($)
$ / Boe
Sep. 30, 2015
USD ($)
[1]
Jun. 30, 2015
USD ($)
[1]
Mar. 31, 2015
USD ($)
[1]
Dec. 31, 2014
USD ($)
[1]
Sep. 30, 2014
USD ($)
[1]
Jun. 30, 2014
USD ($)
$ / Boe
Mar. 31, 2014
USD ($)
[1]
Dec. 31, 2015
USD ($)
$ / Boe
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Liquidity And Going Concern [Line Items]                        
Oil and natural gas sales   $ 17,523 [1] $ 17,546 $ 27,137 $ 18,239 $ 23,037 $ 24,486 $ 52,098 [1] $ 28,071 $ 80,445 $ 127,691 $ 169,277
Borrowings under credit facility   15,000               15,000    
Credit facility borrowing base   $ 20,100               $ 20,100    
Energy Related Derivative [Member]                        
Liquidity And Going Concern [Line Items]                        
Crude oil, average price per Barrel | $ / Boe   33.56           103.23   33.56    
Sonangol P&P [Member] | Subsequent Event [Member]                        
Liquidity And Going Concern [Line Items]                        
Joint interest owner payments $ 19,000                      
[1] As discussed in Note 3 to the consolidated financial statements an error was identified the prepaid royalty account that caused previous periods to be misstated. Total revenues were corrected through an out of period adjustment in the fourth quarter of 2015 with reduction of $2.3 million, overstating operating loss and net loss by $2.3 million.