Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 23,809	$ 23,264
Accounts receivable:
Oil, natural gas, and natural gas liquids revenues	9,205	13,529
Joint interest billings and other	2,108	4,924
Prepaid expenses and other current assets	2,376	498
Current derivative asset	185	3,694
Total current assets	37,683	45,909
Oil and gas properties, successful efforts method:
Proved properties	348,408	283,644
Unproved properties	59,942	34,609
Total oil and gas properties	408,350	318,253
Accumulated depreciation, depletion, and amortization	(135,823)	(119,920)
Net oil and gas properties	272,527	198,333
Other noncurrent assets:
Goodwill	20,549	17,532
Office and other equipment, less accumulated depreciation of $1,426 and $1,028 at September 30, 2016 and December 31, 2015	1,605	1,934
Other noncurrent assets	1,112	1,236
TOTAL ASSETS	333,476	264,944
Current liabilities:
Accounts payable	12,529	11,580
Accrued expenses	10,445	12,975
Revenues and royalties payable	6,846	8,576
Advances	6,481	15,447
Current portion of long-term debt	1,591
Current derivative liability	1,237
Total current liabilities	39,129	48,578
Noncurrent liabilities:
Long-term debt	13,104	11,191
Asset retirement obligations	5,815	5,075
Noncurrent derivative liability	1,101
Deferred tax liability	1,051
Other noncurrent liabilities	183	227
Total noncurrent liabilities	21,254	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 September 30, 2016 and December 31, 2015	23	14
Additional paid-in capital	452,790	358,086
Accumulated deficit	(179,260)	(157,767)
Treasury stock, 15,357 shares at September 30, 2016 and December 31, 2015	(460)	(460)
Total equity	273,093	199,873
TOTAL LIABILITIES AND EQUITY	$ 333,476	$ 264,944