License and Collaboration Agreements - Summary of Accounts Recerivable, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current accounts receivable:
Billed to customers	$ 250	$ 280
Unbilled Zolgensma royalties	17,809	27,027
Other unbilled	802	775
Current accounts receivable, net	18,861	28,082
Non-current accounts receivable:
Due from Abeona, net of present value discount	4,256	4,152
Other unbilled	1,300	1,504
Allowance for credit losses	(4,256)	(4,152)
Non-current accounts receivable, net	1,300	1,504
Total accounts receivable, net	$ 20,161	$ 29,586