Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 5,684	$ 23,264
Accounts receivable:
Oil, natural gas, and natural gas liquids revenues	12,161	13,529
Joint interest billings and other	3,034	4,924
Current derivative assets	2,460	3,694
Prepaid expenses and other current assets	721	498
Total current assets	24,060	45,909
Oil and gas properties, successful efforts method:
Proved properties	287,683	283,644
Unproved properties	32,926	34,609
Total oil and gas properties	320,609	318,253
Accumulated depreciation, depletion, and amortization	(125,294)	(119,920)
Net oil and gas properties	195,315	198,333
Other noncurrent assets:
Goodwill	17,532	17,532
Office and other equipment, less accumulated depreciation of $1,174 and $1,028 at March 31, 2016 and December 31, 2015	1,808	1,934
Other noncurrent assets	1,192	1,236
Noncurrent derivative assets	7
TOTAL ASSETS	239,914	264,944
Current liabilities:
Accounts payable	11,381	11,580
Accrued expenses	8,598	12,975
Revenues and royalties payable	5,672	8,576
Advances	4,213	15,447
Total current liabilities	29,864	48,578
Noncurrent liabilities:
Long-term debt	11,191	11,191
Asset retirement obligations	5,195	5,075
Other noncurrent liabilities	212	227
Total noncurrent liabilities	16,598	16,493
Total liabilities	$ 46,462	$ 65,071
Commitments and Contingencies (Note 9)
Equity:
Preferred stock, $0.001 par value, 20,000,000 shares authorized; none issued or outstanding
Common stock, $0.001 par value, 100,000,000 shares authorized; 13,835,128 shares issued and outstanding at March 31, 2016 and December 31, 2015	$ 14	$ 14
Additional paid-in capital	358,086	358,086
Accumulated deficit	(164,188)	(157,767)
Treasury stock, 15,357 shares at March 31, 2016 and December 31, 2015	(460)	(460)
Total equity	193,452	199,873
TOTAL LIABILITIES AND EQUITY	$ 239,914	$ 264,944