Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net loss attributable to NextDecade Corporation	$ (60,071)	$ (22,039)
Adjustment to reconcile net loss to net cash used in operating activities
Depreciation	162	184
Share-based compensation expense (forfeiture)	7,472	(4,313)
Loss on Common Stock Warrant liabilities	5,747	2,533
Amortization of right-of-use assets	756	551
Amortization of other non-current assets	354	1,416
Changes in operating assets and liabilities:
Prepaid expenses	(314)	(186)
Accounts payable	684	(26)
Operating lease liabilities	(678)	(548)
Accrued expenses and other liabilities	5,812	4,468
Net cash used in operating activities	(40,076)	(17,960)
Investing activities:
Acquisition of property, plant and equipment	(33,753)	(12,105)
Acquisition of other non-current assets	(7,135)	(6,429)
Net cash used in investing activities	(40,888)	(18,534)
Financing activities:
Proceeds from sale of Series C Convertible Preferred Stock	10,500	39,500
Proceeds from sale of common stock	115,000	557
Equity issuance costs	(3,952)	(268)
Preferred stock dividends	(75)	(67)
Shares repurchased related to share-based compensation	(3,272)	(284)
Net cash provided by financing activities	118,201	39,438
Net increase in cash and cash equivalents	37,237	2,944
Cash and cash equivalents – beginning of period	25,552	22,608
Cash and cash equivalents – end of period	62,789	25,552
Non-cash investing activities:
Accounts payable for acquisition of property, plant and equipment	162	117
Accrued liabilities for acquisition of property, plant and equipment	12,046	926
Accrued liabilities for acquisition of other non-current assets	279	0
Pipeline assets obtained in exchange for other non-current liabilities	0	84
Non-cash financing activities:
Paid-in-kind dividends on Convertible Preferred Stock	24,207	18,227
Accretion of deemed dividends on Series A Convertible Preferred Stock	0	63
Accrued liabilities for equity issuance costs	$ 0	$ 35