Fair Value Measurements - Hierarchy for Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	$ 14	$ 1,153
Payment-dependent notes receivable, noncurrent	16,287	13,453
Payment-dependent notes payable, current	14	1,153
Payment-dependent notes payable, noncurrent	16,287	13,453
Warrant liabilities	26,660	7,844
Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	14	1,153
Payment-dependent notes receivable, noncurrent	16,287	13,453
Total financial assets	189,817	38,846
Payment-dependent notes payable, current	14	1,153
Payment-dependent notes payable, noncurrent	16,287	13,453
Warrant liabilities		7,844
Total financial liabilities	42,961	22,450
Fair Value, Recurring | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	5,000
Fair Value, Recurring | Public Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	1,199
Fair Value, Recurring | Private Placement Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	20,461
Fair Value, Recurring | Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents:	173,516	24,240
Fair Value, Recurring | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	14	1,153
Payment-dependent notes receivable, noncurrent	0	0
Total financial assets	173,530	25,393
Payment-dependent notes payable, current	14	1,153
Payment-dependent notes payable, noncurrent	0	0
Warrant liabilities		0
Total financial liabilities	1,213	1,153
Fair Value, Recurring | Level 1 | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0
Fair Value, Recurring | Level 1 | Public Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	1,199
Fair Value, Recurring | Level 1 | Private Placement Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0
Fair Value, Recurring | Level 1 | Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents:	173,516	24,240
Fair Value, Recurring | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	0	0
Payment-dependent notes receivable, noncurrent	0	0
Total financial assets	0	0
Payment-dependent notes payable, current	0	0
Payment-dependent notes payable, noncurrent	0	0
Warrant liabilities		0
Total financial liabilities	0	0
Fair Value, Recurring | Level 2 | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0
Fair Value, Recurring | Level 2 | Public Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0
Fair Value, Recurring | Level 2 | Private Placement Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0
Fair Value, Recurring | Level 2 | Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents:	0	0
Fair Value, Recurring | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	0	0
Payment-dependent notes receivable, noncurrent	16,287	13,453
Total financial assets	16,287	13,453
Payment-dependent notes payable, current	0	0
Payment-dependent notes payable, noncurrent	16,287	13,453
Warrant liabilities		7,844
Total financial liabilities	41,748	21,297
Fair Value, Recurring | Level 3 | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	5,000
Fair Value, Recurring | Level 3 | Public Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	0
Fair Value, Recurring | Level 3 | Private Placement Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	20,461
Fair Value, Recurring | Level 3 | Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents:	$ 0	$ 0