EARNINGS PER SHARE - Schedule of Basic Earnings and Diluted Per Share of Common Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator
Net (loss) income	$ (429)	$ 1,279
Less: Net income attributable to the member units units before the reorganization	0	(647)
Net (loss) income attributable to Greenidge	$ (429)	$ 632
Denominator
Basic weighted average shares outstanding	41,058	28,139
Dilutive effect of equity awards	0	8
Dilutive effect of convertible preferred stock	0	0
Diluted weighted average shares outstanding	41,058	28,147
(Loss) earnings per share
Basic	$ (0.01)	$ 0.02
Diluted	$ (0.01)	$ 0.02