Finance Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total before allowance for credit losses	$ 189,941	$ 212,879
Allowance for credit losses	(8,388)	(8,388)
Total carrying value	181,553	204,491
Life Science Term Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total before allowance for credit losses	136,312	164,032
Total carrying value	136,312	164,032
Life Science Royalty Purchases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total before allowance for credit losses	53,629	48,847
Total carrying value	$ 45,241	$ 40,459