Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Operating expenses:
Net loss from discontinued operations attributable to Bakkt Holdings, Inc.	$ (1,032)	$ (1,163)	$ (4,742)	$ (3,663)
Current liabilities:
Total liabilities	4,968		4,968		$ 0
Discontinued Operations, Held-for-Sale | Loyalty Business
Revenues:
Loyalty services revenues	9,269	12,086	28,202	38,085
Operating expenses:
Compensation and benefits	8,868	11,217	28,855	36,747
Professional services	48	64	111	320
Technology and communication	1,451	2,076	4,619	6,351
Selling, general and administrative	295	663	947	2,075
Impairment of long-lived assets	228	0	228	145
Other operating costs	165	312	679	1,091
Total operating expenses	11,055	14,332	35,439	46,729
Operating loss	(1,786)	(2,246)	(7,237)	(8,644)
Other income (expense), net	202	(283)	(772)	234
Loss before income taxes	(1,584)	(2,529)	(8,009)	(8,410)
Income tax (expense) benefit	(18)	1	(2)	3
Net loss from discontinued operations attributable to Bakkt Holdings, Inc.	(1,602)	(2,528)	(8,011)	(8,407)
Current assets:
Accounts receivable, net	20,377		20,377		16,965
Prepaid insurance	0		0		1
Other current assets	502		502		553
Total current assets	20,879		20,879		17,519
Other assets	3,576		3,576		2,165
Total assets	24,455		24,455		19,684
Current liabilities:
Accounts payable and accrued liabilities	18,758		18,758		25,651
Deferred revenue, current	1,440		1,440		1,605
Other current liabilities	654		654		526
Total current liabilities	20,852		20,852		27,782
Deferred revenue, noncurrent	1,864		1,864		2,621
Other noncurrent liabilities	3,104		3,104		3,504
Total liabilities	25,820		25,820		$ 33,907
Non-cash lease expense	137	145	416	435
Share-based compensation expense	334	321	1,158	839
Total	$ 471	$ 466	$ 1,574	$ 1,273