Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 30	$ 4,926
Items not involving cash:
Depreciation, depletion and amortization	6,202	1,847
Accretion of asset retirement obligations	510	232
Unrealized commodity derivative loss (gain)	8,381	(2,179)
Warrant derivative gain	(225)	(2,494)
Stock-based compensation expense	672	752
Equity investment income	(6,511)	315
Amortization of debt issuance costs	468	131
Other		(108)
Net change in:
Accounts receivable	(2,975)	863
Prepaid expenses, deposits and other current assets	456	(280)
Accounts payable, accrued liabilities, firm transportation contract obligations, and other long-term obligations	(1,945)	(1,425)
Other non-current assets	(1,751)
Net cash provided by operating activities	3,312	2,580
Cash flows from investing activities:
Development and acquisition of properties and equipment	(44,681)	(1,268)
Proceeds from sale of oil and gas properties and other assets		16
Other long-term assets	275	(56)
Investment in affiliates		(6,798)
Net cash used in investing activities	(44,406)	(8,106)
Cash flows from financing activities:
Proceeds from credit facility	34,529	7,210
Proceeds from preferred shares	5,000
Payments on credit facility	(14)	(1,300)
Payments of debt issuance costs	(586)	(59)
Contributions from non-controlling interests	5,000
Distributions to non-controlling interests	(8)	(64)
Net cash provided by (used in) financing activities	43,921	5,787
Net increase in cash and cash equivalents	2,827	261
Cash and cash equivalents, beginning of period	1,650	858
Cash and cash equivalents, end of period	$ 4,477	$ 1,119