License and Collaboration Agreements - Summary of Accounts Recerivable, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current accounts receivable:
Billed to customers	$ 393	$ 280
Unbilled Zolgensma royalties	20,303	27,027
Other unbilled	684	775
Current accounts receivable, net	21,380	28,082
Non-current accounts receivable:
Due from Abeona, net of present value discount	$ 4,364	$ 4,152
Other Receivable, after Allowance for Credit Loss, Noncurrent, Related and Nonrelated Party Status [Extensible Enumeration]	Related Party [Member]	Related Party [Member]
Other unbilled	$ 1,143	$ 1,504
Allowance for credit losses	(4,364)	(4,152)
Non-current accounts receivable, net	1,143	1,504
Total accounts receivable, net	$ 22,523	$ 29,586