Related Party Transactions (Details) - USD ($) $ in Thousands			3 Months Ended			9 Months Ended
	Mar. 21, 2022	Sep. 13, 2021	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Oct. 31, 2022
Related Party Transaction [Line Items]
Adjustments to stock issuance costs	$ 58,700				$ 58,673
Acquisition-related transaction costs			$ 0	$ 821		$ 0	$ 5,219
Proceeds from PIPE investment and A&R FPA investors						0	208,500
Total revenues			18,563	15,900		50,762	52,562
Placement fees
Related Party Transaction [Line Items]
Total revenues			7,283	8,227		17,638	33,763
Affiliated Entity | Temasek Holding | Forge Global Holdings, Inc.
Related Party Transaction [Line Items]
Ownership percentage								5.00%
Affiliated Entity | Financial Technology Partners
Related Party Transaction [Line Items]
Related party transaction							18,300
Adjustments to stock issuance costs							17,400
Acquisition-related transaction costs							900
Affiliated Entity | Temasek Holding
Related Party Transaction [Line Items]
Shares issued (in shares)		1,000,000
Proceeds from PIPE investment and A&R FPA investors		$ 10,000
Director | James Herbert II
Related Party Transaction [Line Items]
Shares issued (in shares)		75,000
Proceeds from PIPE investment and A&R FPA investors		$ 800
Related Party | Placement fees
Related Party Transaction [Line Items]
Total revenues			0	$ 600		0	$ 600
Immediate Family Member of Management or Principal Owner | Placement fees
Related Party Transaction [Line Items]
Related party transaction			10,000			11,300
Total revenues			$ 200			$ 300