Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net loss attributable to NextDecade Corporation	$ (22,349)	$ (15,238)
Adjustment to reconcile net loss to net cash used in operating activities
Depreciation	89	93
Share-based compensation expense (forfeiture)	515	(2,862)
Loss on common stock warrant liabilities	4,418	6,806
Amortization of right-of-use assets	330	281
Amortization of other non-current assets	354	708
Changes in operating assets and liabilities:
Prepaid expenses	(166)	(114)
Accounts payable	432	(9)
Operating lease liabilities	(266)	(307)
Accrued expenses and other liabilities	(832)	2,942
Net cash used in operating activities	(17,475)	(7,700)
Investing activities:
Acquisition of property, plant and equipment	(2,602)	(5,481)
Acquisition of other non-current assets	(3,608)	(3,104)
Net cash used in investing activities	(6,210)	(8,585)
Financing activities:
Proceeds from sale of Series C Convertible Preferred Stock	10,500	34,500
Proceeds from sale of common stock	30,000	0
Equity issuance costs	(76)	(61)
Preferred stock dividends	(39)	(27)
Shares repurchased related to share-based compensation	(1,752)	(140)
Net cash provided by financing activities	38,633	34,272
Net increase in cash and cash equivalents	14,948	17,987
Cash and cash equivalents – beginning of period	25,552	22,608
Cash and cash equivalents – end of period	40,500	40,595
Non-cash investing activities:
Accounts payable for acquisition of property, plant and equipment	777	18
Accrued liabilities for acquisition of property, plant and equipment	1,227	975
Pipeline assets obtained in exchange for other non-current liabilities	0	84
Non-cash financing activities:
Paid-in-kind dividends on Convertible Preferred Stock	11,490	7,724
Accounts payable for equity issuance costs	9	0
Accretion of deemed dividends on Series A Convertible Preferred Stock	$ 0	$ 31