Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenues	$ 0	$ 0
Operating expenses:
General and administrative expense	111,468	49,093
Development expense, net	4,891	4,101
Lease expense	6,141	1,119
Depreciation expense	168	162
Total operating expenses	122,668	54,475
Total operating loss	(122,668)	(54,475)
Other income (expense):
Loss on common stock warrant liabilities	(1,879)	(5,747)
Derivative loss, net	(44,803)	0
Interest expense, net of capitalized interest	(50,285)	0
Loss on debt extinguishment	(9,531)	0
Other income, net	7,526	151
Total other expense	(98,972)	(5,596)
Net loss attributable to NextDecade Corporation	(221,640)	(60,071)
Less: net loss attributable to non-controlling interest	(59,379)	0
Less: preferred stock dividends	20,484	24,282
Net loss attributable to common stockholders	$ (182,745)	$ (84,353)
Net loss per common share - basic (in usd per share)	$ (0.94)	$ (0.65)
Net loss per common share - diluted (in usd per share)	$ (0.94)	$ (0.65)
Weighted average shares outstanding - basic (in shares)	194,595	130,136
Weighted average shares outstanding - diluted (in shares)	194,595	130,136