Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Total revenues	$ 69,383	$ 128,056	$ 51,644
Transaction-based expenses:
Transaction-based expenses	(483)	(3,034)	(3,888)
Total revenues, less transaction-based expenses	68,900	125,022	47,756
Operating expenses:
Compensation and benefits	145,514	94,654	37,330
Professional services	14,265	12,450	3,371
Acquisition-related transaction costs	5,113	882	3,289
Advertising and market development	4,754	5,090	1,528
Rent and occupancy	5,455	3,744	2,381
Technology and communications	11,489	8,243	4,616
General and administrative	11,324	4,358	452
Depreciation and amortization	6,026	5,390	2,406
Total operating expenses	203,940	134,811	55,373
Operating loss	(135,040)	(9,789)	(7,617)
Interest and other income (expenses):
Interest income (expenses), net	2,681	(2,307)	(2,405)
Change in fair value of warrant liabilities	19,836	(6,064)	(292)
Other income (expenses), net	945	47	(201)
Total interest income (expenses) and other income (expenses)	23,462	(8,324)	(2,898)
Loss before provision for income taxes	(111,578)	(18,113)	(10,515)
Provision for (benefit from) income taxes	327	386	(803)
Net loss	(111,905)	(18,499)	(9,712)
Net loss attributable to noncontrolling interest	(46)	0	0
Net loss attributable to Forge Global Holdings, Inc.	$ (111,859)	$ (18,499)	$ (9,712)
Earnings Per Share [Abstract]
Basic (in dollars per share)	$ (0.78)	$ (0.34)	$ (0.26)
Diluted (in dollars per share)	$ (0.80)	$ (0.34)	$ (0.26)
Weighted-average shares used in computing net loss per share attributable to Forge Global Holdings, Inc. common stockholders:
Basic (in shares)	143,839,981	54,295,304	37,308,450
Diluted (in shares)	145,013,346	54,295,304	37,308,450
Placement fees
Revenues:
Total revenues	$ 40,665	$ 107,723	$ 29,240
Custodial administration fees
Revenues:
Total revenues	$ 28,718	$ 20,333	$ 22,404