Net Loss per share - Basic and Diluted Per Share Computations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator – basic and diluted:
Net loss from continuing operations	$ (21,554)	$ (3,763)	$ (29,058)	$ (54,671)
Less: Net loss from continuing operations attributable to noncontrolling interest	(7,668)	(2,033)	(11,858)	(30,854)
Net loss from continuing operations attributable to Bakkt Holdings, Inc.	(13,886)	(1,730)	(17,200)	(23,817)
Net loss from discontinued operations attributable to Bakkt Holdings, Inc.	(1,032)	(1,163)	(4,742)	(3,663)
Net loss attributable to Bakkt Holdings, Inc.	$ (14,918)	$ (2,893)	$ (21,942)	$ (27,480)
Denominator – basic and diluted:
Weighted average shares outstanding – basic (in shares)	13,015,011	6,361,793	8,783,195	5,642,609
Weighted average shares outstanding – diluted (in shares)	13,015,011	6,361,793	8,783,195	5,642,609
Net loss per share from continuing operations attributable to Bakkt Holdings, Inc. - basic (in dollars per share)	$ (1.07)	$ (0.27)	$ (1.96)	$ (4.22)
Net loss per share from continuing operations attributable to Bakkt Holdings, Inc. - diluted (in dollars per share)	(1.07)	(0.27)	(1.96)	(4.22)
Net loss per share from discontinued operations attributable to Bakkt Holdings, Inc. - basic (in dollars per share)	(0.08)	(0.18)	(0.54)	(0.65)
Net loss per share from discontinued operations attributable to Bakkt Holdings, Inc. - diluted (in dollars per share)	(0.08)	(0.18)	(0.54)	(0.65)
Net loss per share attributable to Bakkt Holdings, Inc. - basic (in dollars per share)	(1.15)	(0.45)	(2.50)	(4.87)
Net loss per share attributable to Bakkt Holdings, Inc. - diluted (in dollars per share)	$ (1.15)	$ (0.45)	$ (2.50)	$ (4.87)