Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Total revenue	$ 28,774	$ 10,286	$ 5,441
Operating costs and expenses:
Cost of sales	7,071	6,115	7,565
Development expenses	59,629	44,034	59,498
Depreciation, depletion and amortization	20,446	1,567	479
General and administrative expenses	87,487	81,777	98,874
Impairment charge and loss on transfer of assets	0	4,513	0
Goodwill impairment	0	0	77,592
Total operating costs and expenses	174,633	138,006	244,008
Loss from operations	(145,859)	(127,720)	(238,567)
Gain on preferred stock exchange feature	0	0	2,209
Interest income (expense), net	(16,355)	1,574	1,022
Other income, net	10,447	211	4,062
Total loss before income taxes	(151,767)	(125,935)	(231,274)
Income tax benefit (provision)	0	190	(185)
Net loss	$ (151,767)	$ (125,745)	$ (231,459)
Net loss per common share:
Basic and diluted (in dollars per share)	$ (0.69)	$ (0.59)	$ (1.23)
Weighted average shares outstanding:
Basic and diluted (in shares)	218,548	211,574	188,536
Natural gas sales
Revenues:
Total revenue	$ 28,774	$ 4,423	$ 503
LNG sales
Revenues:
Total revenue	0	2,689	3,273
Other LNG revenue
Revenues:
Total revenue	$ 0	$ 3,174	$ 1,665