Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ 0	$ 0	$ 0	$ 0
Operating expenses
General and administrative expense	6,533	4,700	7,903	11,515
Land option and lease expense	234	447	438	858
Depreciation expense	45	64	93	80
Total operating expenses	6,812	5,211	8,434	12,453
Total operating loss	(6,812)	(5,211)	(8,434)	(12,453)
Other income (expense)
(Loss) gain on common stock warrant liabilities	(4,768)	(565)	(6,806)	7,774
Loss on redemption of investment securities	0	0	0	(412)
Interest income, net	0	2	2	235
Other	0	0	0	(16)
Total other (expense) income	(4,768)	(563)	(6,804)	7,581
Net loss attributable to NextDecade Corporation	(11,580)	(5,774)	(15,238)	(4,872)
Preferred stock dividends	(3,876)	(3,509)	(7,751)	(6,952)
Deemed dividends on Series A Convertible Preferred Stock	(15)	(21)	(31)	(97)
Net loss attributable to common stockholders	$ (15,471)	$ (9,304)	$ (23,020)	$ (11,921)
Net loss per common share - basic and diluted (in dollars per share)	$ (0.13)	$ (0.08)	$ (0.19)	$ (0.10)
Weighted average shares outstanding - basic and diluted (in shares)	118,382	117,388	118,322	117,370