Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 18,870	$ 23,264
Accounts receivable:
Oil, natural gas, and natural gas liquids revenues	14,604	13,529
Joint interest billings and other	1,276	4,924
Prepaid expenses and other current assets	718	498
Current derivative asset	19	3,694
Total current assets	35,487	45,909
Oil and gas properties, successful efforts method:
Proved properties	340,086	283,644
Unproved properties	59,724	34,609
Total oil and gas properties	399,810	318,253
Accumulated depreciation, depletion, and amortization	(130,776)	(119,920)
Net oil and gas properties	269,034	198,333
Other noncurrent assets:
Goodwill	20,568	17,532
Office and other equipment, less accumulated depreciation of $1,315 and $1,028 at June 30, 2016 and December 31, 2015	1,705	1,934
Other noncurrent assets	1,183	1,236
TOTAL ASSETS	327,977	264,944
Current liabilities:
Accounts payable	10,493	11,580
Accrued expenses	9,266	12,975
Revenues and royalties payable	7,795	8,576
Current porting of long-term debt	1,554
Current derivative liability	1,463
Advances	655	15,447
Total current liabilities	31,226	48,578
Noncurrent liabilities:
Long-term debt	13,505	11,191
Asset retirement obligations	5,597	5,075
Noncurrent derivative liability	1,122
Deferred tax liability	664
Other noncurrent liabilities	198	227
Total noncurrent liabilities	21,086	16,493
Commitments and Contingencies (Note 10)
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; 22,289,177 and 13,835,128 shares issued and outstanding at June 30, 2016 and December 31, 2015	23	14
Additional paid-in capital	451,462	358,086
Accumulated deficit	(175,360)	(157,767)
Treasury stock, 15,357 shares at June 30, 2016 and December 31, 2015	(460)	(460)
Total equity	275,665	199,873
TOTAL LIABILITIES AND EQUITY	$ 327,977	$ 264,944