XML 33 R22.htm IDEA: XBRL DOCUMENT v3.7.0.1
Basis of Presentation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Share-Based Payments      
Stock-based compensation expense $ 770 $ 807  
Discount rate used in future net cash flows relating to proved oil and gas reserves (percent) 10.00%    
Proved property impairment $ 0 35,085  
Entity's asset retirement obligation transactions [Roll Forward]      
Beginning future site restoration obligation 8,623    
New wells placed on production and other 34   $ 119
Deletions related to property disposals and plugging costs 0   (1,832)
Accretion expense 112 135 491
Revisions and other (21)   166
Ending future site restoration obligation $ 8,748   $ 8,623
Employee Stock Option [Member]      
Number of Shares (thousands)      
Outstanding, December 31, 2016 8,154    
Granted 2    
Exercised (5)    
Cancelled 0    
Outstanding, March 31, 2017 8,151   8,154
Weighted Average Option Exercise Price Per Share      
Outstanding, December 31, 2016 $ 2.39    
Granted 2.24    
Exercised 0.97    
Cancelled/Forfeited 0.00    
Outstanding, March 31, 2017 2.39   $ 2.39
Weighted Average Grant Date Fair Value Per Share      
Outstanding, December 31, 2016 1.70    
Granted 1.31    
Exercised 0.65    
Cancelled 0.00    
Outstanding, March 31, 2017 $ 1.71   $ 1.70
Share-Based Payments      
Stock-based compensation expense $ 434 457  
Unamortized compensation cost expected to be recognized in 2016 through 2020 $ 2,600    
Restricted Stock [Member]      
Number of Shares (thousands)      
Unvested, December 31, 2016 1,492    
Granted 0    
Vested/Released (2)    
Forfeited 0    
Unvested, March 31, 2017 1,490   1,492
Weighted Average Grant Date Fair Value Per Share (in US$ per share)      
Unvested, December 31, 2016 $ 3.47    
Granted 0.00    
Vested/Released 3.22    
Forfeited 0.00    
Unvested, March 31, 2017 $ 3.47   $ 3.47
Share-Based Payments      
Stock-based compensation expense $ 336 $ 350  
Unamortized compensation cost expected to be recognized in 2016 through 2020 $ 1,600