Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Jan. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deposit paid		$ 2,692	$ 313
Payments to acquire notes receivable			$ 1,916
IntelGenx [Member] \| Amended and Restated Loan Agreement [Member] \| Subsequent Event [Member]
Payments to acquire notes receivable	$ 3,000
Dalriada License Agreement [Member] \| Subsequent Event [Member]
Deposit paid	$ 1,100

The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration