Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operations
Revenues	$ 0	$ 0	$ 0	$ 0
Operating Expenses
General and administrative expenses	6,214	14,014	25,533	18,392
Invitation to bid contract costs	4,418		4,418
Land option and lease expenses	297	250	797	733
Depreciation expense	50	26	127	78
Total operating expenses	10,979	14,290	30,875	19,203
Total operating loss	(10,979)	(14,290)	(30,875)	(19,203)
Other income (expense)
Gain on common stock warrant liabilities	83		83
Interest income, net	222	145	475	236
Other	(6)	(12)	(45)	(31)
Total other income	299	133	513	205
Net loss attributable to NextDecade Corporation	(10,680)	(14,157)	(30,362)	(18,998)
Deemed dividends on Series A Convertible Preferred Stock	271		271
Net loss attributable to common shareholders	$ (10,951)	$ (14,157)	$ (30,633)	$ (18,998)
Net loss per common share - basic and diluted	$ (0.10)	$ (0.14)	$ (0.29)	$ (0.19)
Weighted average shares outstanding - basic and diluted	106,639	103,870	106,476	99,124
Comprehensive Loss
Net loss attributable to NextDecade Corporation	$ (10,680)	$ (14,157)	$ (30,362)	$ (18,998)
Other comprehensive loss:
Change in fair value of investments		6		9
Comprehensive loss	$ (10,680)	$ (14,151)	$ (30,362)	$ (18,989)