Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating activities:
Net loss attributable to NextDecade Corporation	$ (41,146)	$ (14,016)
Adjustment to reconcile net loss to net cash used in operating activities
Depreciation	129	136
Share-based compensation expense (forfeiture)	3,555	(5,571)
Loss on common stock warrant liabilities	7,192	2,363
Amortization of right-of-use assets	522	414
Amortization of other non-current assets	354	1,062
Changes in operating assets and liabilities:
Prepaid expenses	(460)	(234)
Accounts payable	294	76
Operating lease liabilities	(482)	(396)
Accrued expenses and other liabilities	2,081	3,914
Net cash used in operating activities	(27,961)	(12,252)
Investing activities:
Acquisition of property, plant and equipment	(5,673)	(8,390)
Acquisition of other non-current assets	(5,343)	(4,666)
Net cash used in investing activities	(11,016)	(13,056)
Financing activities:
Proceeds from sale of Series C Convertible Preferred Stock	10,500	39,500
Proceeds from sale of common stock	115,000	389
Equity issuance costs	(2)	(117)
Preferred stock dividends	(38)	(50)
Shares repurchased related to share-based compensation	(2,812)	(279)
Net cash provided by financing activities	122,648	39,443
Net increase in cash and cash equivalents	83,671	14,135
Cash and cash equivalents – beginning of period	25,552	22,608
Cash and cash equivalents – end of period	109,223	36,743
Non-cash investing activities:
Accounts payable for acquisition of property, plant and equipment	470	329
Accrued liabilities for acquisition of property, plant and equipment	3,904	996
Pipeline assets obtained in exchange for other non-current liabilities	0	84
Non-cash financing activities:
Paid-in-kind dividends on Convertible Preferred Stock	17,722	12,965
Accounts payable for equity issuance costs	3,888	148
Accretion of deemed dividends on Series A Convertible Preferred Stock	0	47
Accrued liabilities for equity issuance costs	$ 83	$ 35