Basis of Presentation (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 24, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jun. 24, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 582,000	$ 520,000	$ 2,050,000	$ 1,662,000
Weighted Average Grant Date Fair value Per Share [Abstract]
Stock Issued During Period, Shares, New Issues	11,500,000
Shares Issued, Price Per Share							$ 5.00
Proceeds from Issuance of Common Stock				53,755,000	0
Entity's asset retirement obligation transactions [Roll Forward]
Beginning asset retirement obligation				9,888,000	11,381,000	11,381,000
New wells placed on production and other				267,000		222,000
Deletions related to property disposals and plugging costs				(851,000)		(2,491,000)
Accretion expense				436,000	487,000	638,000
Revisions				(201,000)		138,000
Ending asset retirement obligation		9,539,000		9,539,000		9,888,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		361,000	408,000	1,475,000	1,328,000
Number of Shares [Abstract]
Outstanding, beginning (in shares)				5,400,000
Granted (in shares)				1,022,000
Exercised (in shares)				(410,000)
Canceled (in shares)				(119,000)
Outstanding, ending (in shares)		5,893,000		5,893,000
Weighted Average Option Exercise Price Per Share [Abstract]
Outstanding, beginning (in dollars per share)				$ 2.77
Granted (in dollars per share)				$ 3.37
Exercised (in dollars per share)				$ 2.71
Canceled (in dollars per share)				$ 3.03
Outstanding, ending (in dollars per share)		$ 2.87		$ 2.87
Weighted Average Grant Date Fair Value Per Share [Abstract]
Outstanding, beginning (in dollars per share)				$ 1.98
Granted (in dollars per share)				$ 2.44
Exercised (in dollars per share)				$ 1.86
Canceled (in dollars per share)				$ 2.16
Outstanding, ending (in dollars per share)		$ 2.06		$ 2.06
Options exercisable (in shares)		4,109,000		4,109,000		3,828,000
Unamortized compensation expense		2,900,000		2,900,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		221,000	112,000	575,000	334,000
Weighted Average Grant Date Fair Value Per Share [Abstract]
Unamortized compensation expense		2,200,000		2,200,000
Number of Shares [Abstract]
Unvested, beginning (in shares)				355,000
Granted (in shares)				763,000
Vested/Released (in shares)				(120,000)
Forfeited (in shares)				(29,000)
Unvested, ending (in shares)		969,000		969,000
Weighted Average Grant Date Fair value Per Share [Abstract]
Unvested, beginning (in dollars per share)				$ 3.24
Granted (in dollars per share)				$ 3.16
Vested/Released (in dollars per share)				$ 3.65
Forfeited (in dollars per share)				$ 3.45
Unvested, ending (in dollars per share)		$ 3.12		$ 3.12
Canada
Weighted Average Grant Date Fair value Per Share [Abstract]
Unamortized Costs Capitalized Less Related Deferred Income Taxes Exceed Ceiling Limitations, Expense					$ 2,100,000