Stockholders’ Equity - Schedule of Basic and Diluted Per Share Computations for Continuing Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025
Numerator:
Net loss	$ (17,902)	$ (16,070)	$ (25,787)	$ (7,780)	$ (7,354)
(Less) Net income (loss) attributable to non-controlling interest	(436)				202
Net loss attributable to Soluna Holdings, Inc.	(17,466)				(7,556)
Less: Preferred dividends or deemed dividends	0				0
Less: Cumulative Preferred Dividends in arrears	(2,950)				(2,952)
Balance	$ (20,416)				$ (10,508)
Basic and Diluted EPS:
Common shares outstanding, beginning of period, including penny warrants and excluding restricted stock awards not vested (in shares)	83,988,996				8,106,814
Weighted average common shares issued during the period including penny warrants issued and outstanding and excluding restricted stock awards not vested as of quarter-end (in shares)	112,324				612,537
Denominator for basic earnings per common shares - weighted average common shares (in shares)	84,101,320				8,719,351
Denominator for diluted earnings per common shares - weighted average common shares (in shares)	84,101,320				8,719,351
Basic loss per share (in dollars per share)	$ (0.24)				$ (1.21)
Diluted loss per share (in dollars per share)	$ (0.24)				$ (1.21)