Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenues
Operating Expenses
General and administrative expenses	22,548	35,182
Invitation to Bid Contract Costs	10,163	6,563
Land option and lease expenses	2,039	1,099
Depreciation expense	251	171
Total operating expenses	35,001	43,015
Total operating loss	(35,001)	(43,015)
Other income (expense)
(Loss) gain on Common Stock Warrant liabilities	(2,657)	164
Interest income, net	1,718	1,019
Other	69	(128)
Total other income	(870)	1,055
Net loss attributable to NextDecade Corporation	(35,871)	(41,960)
Preferred stock dividends	(11,164)	(724)
Deemed dividends on Series A Convertible Preferred Stock	(1,517)	(822)
Net loss attributable to common stockholders	$ (48,552)	$ (43,506)
Net loss per common share - basic and diluted (in dollars per share)	$ (0.45)	$ (0.41)
Weighted average shares outstanding - basic and diluted (in shares)	109,057	106,564