Fair Value of Financial Instruments - Additional Information about Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - Measured on a recurring basis - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 161,000	$ 146,000
Total Realized and Unrealized Gains (Losses) Included in Income			134,000
Purchases			1,000
Sales/Exits			(131,000)
Issuances			16,000
Transfers Out of Level 3			(5,000)
Ending Balance			161,000
Equity warrant assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 192,000	161,000	145,000
Total Realized and Unrealized Gains (Losses) Included in Income	561,000	229,000	134,000
Purchases	0	0	1,000
Sales/Exits	(502,000)	(215,000)	(130,000)
Issuances	24,000	19,000	16,000
Transfers Out of Level 3	(6,000)	(2,000)	(5,000)
Ending Balance	$ 269,000	192,000	161,000
Fair value accounting | Non-marketable securities | Unconsolidated venture capital and private equity fund investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 0	1,000
Total Realized and Unrealized Gains (Losses) Included in Income			0
Purchases			0
Sales/Exits			(1,000)
Issuances			0
Transfers Out of Level 3			0
Ending Balance			$ 0