Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Oil and gas properties
Accumulated depreciation, depletion, amortization and impairment	$ (63,929)	$ (61,736)
Net oil and gas properties	44,910	41,268
Furniture and fixtures, computer hardware and software, and other equipment	1,039	960
Accumulated depreciation and amortization	(787)	(673)
Net other property and equipment	252	287
Total property and equipment	45,162	41,555
Proved oil and gas properties [Member]
Oil and gas properties
Oil and gas properties, gross	105,400	100,769
Unproved properties not subject to depletion [Member]
Oil and gas properties
Oil and gas properties, gross	$ 3,439	$ 2,235