Fair Value Measurements - Hierarchy for Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	$ 5	$ 1,153
Payment-dependent notes receivable, noncurrent	7,371	13,453
Payment-dependent notes payable, current	5	1,153
Payment-dependent notes payable, noncurrent	7,371	13,453
Warrant liabilities	606	7,844
Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	5	1,153
Payment-dependent notes receivable, noncurrent	7,371	13,453
Total financial assets	156,515	38,846
Payment-dependent notes payable, current	5	1,153
Payment-dependent notes payable, noncurrent	7,371	13,453
Warrant liabilities		7,844
Total financial liabilities	7,982	22,450
Fair Value, Recurring | Legacy Forge warrant liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	384
Fair Value, Recurring | Private placement warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	222
Fair Value, Recurring | Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents	149,139	24,240
Fair Value, Recurring | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment-dependent notes receivable, current	5	1,153
Payment-dependent notes receivable, noncurrent	0	0
Total financial assets	149,144	25,393
Payment-dependent notes payable, current	5	1,153
Payment-dependent notes payable, noncurrent	0	0
Warrant liabilities		0
Total financial liabilities	5	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 | 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	149,139	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 | 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	7,371	13,453
Total financial assets	7,371	13,453
Payment-dependent notes payable, current	0	0
Payment-dependent notes payable, noncurrent	7,371	13,453
Warrant liabilities		7,844
Total financial liabilities	7,977	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	384
Fair Value, Recurring | Level 3 | Private placement warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrant liabilities	222
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