Allocation of Personnel Expenses -Summary of Allocation of Personnel Expenses By Nature (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based payments	$ (1,551)	$ 74	$ (4,078)	$ 2,965
Total Operating expenses	25,691	33,923	87,912	131,169
Expenses by Nature [Member]
Wages and salaries	3,793	7,021	12,629	33,121
Social security contributions	1,110	933	3,505	5,669
Expenses for pension commitments	286	617	981	1,116
Employer contribution to bonus shares	497	981	1,955	(241)
Share-based payments	1,551	(74)	4,078	(2,965)
Total Operating expenses	$ 7,236	$ 9,477	$ 23,148	$ 36,701

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration