Stock-Based Compensation - Summary of restricted stock awards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	$ 63,362	$ 67,158
Atai ESOP [Member] | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	41,343	66,874
Atai HSOP [Member] | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	21,102
Other Subsidiaries Equity Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	900	300
Other Subsidiaries Equity Plan | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	917	284
Research and Development Expense [Member] | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	19,339	271
Research and Development Expense [Member] | Atai ESOP [Member] | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	18,676
Research and Development Expense [Member] | Atai HSOP [Member] | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense
Research and Development Expense [Member] | Other Subsidiaries Equity Plan | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	662	271
General and Administrative Expense [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense		61,500
General and Administrative Expense [Member] | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	44,023	66,887
General and Administrative Expense [Member] | Atai ESOP [Member] | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	22,667	66,874
General and Administrative Expense [Member] | Atai HSOP [Member] | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	21,102
General and Administrative Expense [Member] | Other Subsidiaries Equity Plan | Options and Restricted Stock Awards [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense	$ 255	$ 13