Equity Method Investments and Other Investments - Summary of Statements of operations (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Shedule Of Equity Method Investment Summarized Statement Of Operations [Line Items]
Revenue		$ 170	$ 0	$ 170	$ 19,880
Net loss		(37,509)	(53,373)	(75,067)	(49,329)
COMPASS Pathways Plc Two [Member]
Shedule Of Equity Method Investment Summarized Statement Of Operations [Line Items]
Revenue		0	0	0	0
Loss from continuing operations		(27,256)	(19,528)	(52,676)	(33,130)
Net loss		(21,037)	(19,528)	(42,208)	(33,130)
Neuronasal Inc [Member]
Shedule Of Equity Method Investment Summarized Statement Of Operations [Line Items]
Revenue	[1]	0	0	0	0
Loss from continuing operations	[1]	0	(409)	0	(985)
Net loss	[1]	0	(409)	0	(985)
GABA Therapeutics Inc [Member]
Shedule Of Equity Method Investment Summarized Statement Of Operations [Line Items]
Revenue		0	0	0	0
Loss from continuing operations		(1,964)	(387)	(3,570)	(1,046)
Net loss		$ (1,964)	$ (387)	$ (3,570)	$ (1,046)

[1] Results from operations for Neuronasal are through May 17, 2021 at which point the entity is consolidated.