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License Agreements - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Dec. 10, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jan. 31, 2022	Dec. 31, 2021	Jun. 30, 2020
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Research and development expenses				$ 357	$ 8,934
ATAI Kures Inc. [Member] \| License Agreement Terms [Member]
License Agreements [Line Items]
Percentage of the common stock shares outstanding		5.00%		5.00%				5.00%
Otsuka Agreement [Member]
License Agreements [Line Items]
Revenue recognized upon performance obligation satisfied					19,700
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License Agreements [Line Items]
Contract with customer liability, revenue recognized				$ 200
Columbia Stock Purchase and License Agreement [Member]
License Agreements [Line Items]
Material Payment			$ 0		0
Columbia Stock Purchase and License Agreement [Member] \| ATAI Kures Inc. [Member]
License Agreements [Line Items]
Research and development expenses		$ 300
Accelerate License Agreement [Member]
License Agreements [Line Items]
Material Payment		0	0	0	0
CHIBA License [Member]
License Agreements [Line Items]
Material Payment		0	0	0	0
Allergan License Agreement [Member]
License Agreements [Line Items]
Material Payment		0	$ 0	0	$ 0
Dalriada License Agreement [Member]
License Agreements [Line Items]
Research and development expenses		1,400		1,800
Service fees	$ 12,800
Dalriada License Agreement [Member] \| Service, Other [Member]
License Agreements [Line Items]
Service fees		0		0
Invyxis ESLA [Member]
License Agreements [Line Items]
Upfront deposit						$ 1,100
Otsuka [Member] \| Otsuka Agreement [Member]
License Agreements [Line Items]
Performance obligation							$ 20,000
Otsuka [Member] \| Otsuka Agreement [Member] \| Outset Of The Otsuka Agreement [Member]
License Agreements [Line Items]
Performance obligation		20,000		20,000
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License Agreements [Line Items]
Milestone payments, receivable		66,000		66,000
Otsuka [Member] \| Development And Regulatory Milestones [Member] \| Otsuka Agreement [Member]
License Agreements [Line Items]
Milestone payments, receivable		$ 35,000		$ 35,000