Investment in Equity Securities, at Fair Value and Long-term Investments - Summary of Long-term investments (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Schedule Of Long Term Investments
Cost	$ 35,620	$ 32,658
Gross unrealized gains	7,313	7,041
Gross unrealized losses (including impairment)	(1,556)	(1,451)
Foreign currency translation adjustment	294	1,880
Aggregate fair value	41,671	40,128
Alesta Tx | Available-for-sale debt securities | Convertible loan
Schedule Of Long Term Investments
Cost	261	261
Gross unrealized gains	13	7
Aggregate fair value	274	268
Alesta Tx | Equity securities without readily determinable fair value | Equity Securities
Schedule Of Long Term Investments
Cost	2,250	2,250
Gross unrealized losses (including impairment)	(865)	(865)
Aggregate fair value	1,385	1,385
Juventas Cell Therapy Ltd. | Equity securities without readily determinable fair value | Equity Securities
Schedule Of Long Term Investments
Cost	23,500	23,500
Gross unrealized gains	6,958	6,958
Foreign currency translation adjustment	240	1,850
Aggregate fair value	30,698	32,308
Juventas Cell Therapy Ltd. | Equity securities without readily determinable fair value | Put option
Schedule Of Long Term Investments
Cost	491	491
Gross unrealized losses (including impairment)	(521)	(521)
Foreign currency translation adjustment	30	30
BioInvent International AB | Securities measured at fair value | Warrants
Schedule Of Long Term Investments
Cost	656	656
Gross unrealized losses (including impairment)	(170)	(65)
Aggregate fair value	486	591
Cleave Therapeutics, Inc | Securities measured at fair value | Convertible loan
Schedule Of Long Term Investments
Cost	5,500	5,500
Gross unrealized gains	342	76
Aggregate fair value	5,842	$ 5,576
Precision Autoimmune Therapeutics Co., Ltd | Prepayment for investment | Equity Securities
Schedule Of Long Term Investments
Cost	2,962
Foreign currency translation adjustment	24
Aggregate fair value	$ 2,986