Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ 729	$ (6,421)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	7,889	5,505
Total gain on derivative contracts, net	(4,460)	(765)
Operating portion of net cash (paid) received in settlement of derivative contracts	(586)	1,991
Stock-based compensation	1,311
Accretion of asset retirement obligations	152	128
Deferred income taxes	(38)
Amortization of deferred financing costs	79	70
Changes in assets and liabilities:
Decrease in accounts receivable	5,920	3,258
Increase in prepaid expenses and other current assets	(214)	(244)
Decrease in accounts payable and accrued expenses	(1,710)	(4,576)
Decrease in revenues and royalties payable	(5,161)	(2,904)
Increase (decrease) in advances	455	(11,234)
Net cash provided by (used in) operating activities	4,366	(15,192)
Cash flows from investing activities:
Additions to oil and gas properties	(4,168)	(2,365)
Additions to office and other equipment		(20)
Net cash used in investing activities	(4,168)	(2,385)
Cash flows from financing activities:
Repayments of borrowings	(392)
Deferred financing costs		(3)
Net cash used in financing activities	(392)	(3)
Net decrease in cash and cash equivalents	(194)	(17,580)
Cash at beginning of period	10,200	23,264
Cash at end of period	10,006	5,684
Cash paid for:
Interest	147	142
Non-cash investing and financing activities:
Asset retirement obligations	21	(8)
Accrued capital expenditures	$ 1,575	$ 5,876