Debt Instrument Face Amount Inclusive Other Payments

No definition available.

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Balance Type:	credit
Period Type:	instant

- Definition

Loan agreement

+ References

No definition available.

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Period Type:	duration

- References

No definition available.

+ Details

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- Definition

Receivables maturity description.

+ References

No definition available.

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- Definition

Receivables maturity terms.

+ References

No definition available.

+ Details

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- Definition

Term loan impairment loss recognized.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Face amount or stated value per share of common stock.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

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+ Details

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

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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+ Details

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

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maturity date of long-term debt, in YYYY-MM-DD format.

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Balance Type:	na
Period Type:	instant

- Definition

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.

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Balance Type:	credit
Period Type:	duration

- Definition

The principal amount of the receivable or note before consideration of the discount or premium.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=atai_AdditionalTermLoanAndMarchTermLoanMember
Namespace Prefix:
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Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
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Notes Receivable - Additional Information (Detail)				12 Months Ended
Notes Receivable - Additional Information (Detail)	Sep. 14, 2021 USD ($)	May 11, 2021 USD ($)	Jan. 03, 2020 USD ($) $ / shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 € / shares	Dec. 31, 2022 € / shares	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares	Jun. 07, 2021 € / shares	Mar. 08, 2021 USD ($)
Notes Receivable [Line Items]
Convertible promissory notes issued							$ 15,000,000
Short-term notes payable							$ 82,500,000
Issuance of common stock shares par value \| (per share)					€ 0.10	€ 0.10	$ 0.12	$ 0.12	€ 0.10
Term Loan Impairment Loss Recognized							$ 0
Amended and Restated Loan Agreement [Member]
Notes Receivable [Line Items]
Loan agreement	$ 6,000,000.0
Term Loan Receivable [Member]
Notes Receivable [Line Items]
Loans and lease receivable, Outstanding							5,500,000	$ 2,500,000
Interest expense				$ 400,000
Long-Term Debt, Fair Value							5,500,000
Loans Receivable [Member]
Notes Receivable [Line Items]
Receivables, Maturity description				On May 14, 2021, the Company amended the loan agreement under which the Maturity Date will be the first business day following the first closing of a subscription for additional units if the proceeds from such subscription amount to at least $3.0 million
IntelGenx Corp [Member]
Notes Receivable [Line Items]
Loans receivable, Fixed interest rate					8.00%
IntelGenx Corp [Member] \| Additional Term Loan And March Term Loan [Member]
Notes Receivable [Line Items]
Payments to acquire notes receivable		$ 500,000
IntelGenx Corp [Member] \| March Term Loan Receivable [Member]
Notes Receivable [Line Items]
Receivable, Face amount										$ 2,000,000.0
IntelGenx Corp [Member] \| Additional Term Loan Receivable [Member]
Notes Receivable [Line Items]
Receivable, Face amount										$ 500,000
IntelGenx Corp [Member] \| Additional Term Loan Receivable [Member] \| Amended and Restated Loan Agreement [Member]
Notes Receivable [Line Items]
Receivable, Face amount	6,000.0
IntelGenx Corp [Member] \| Additional Term Loan Receivable [Member] \| Second Tranche [Member] \| Amended and Restated Loan Agreement [Member]
Notes Receivable [Line Items]
Receivable, Face amount	3,000,000.0
IntelGenx Corp [Member] \| Term Loan Receivable [Member]
Notes Receivable [Line Items]
Receivable, Face amount	$ 8,500,000
IntelGenx Corp [Member] \| Term Loan Receivable [Member] \| Amended and Restated Loan Agreement [Member]
Notes Receivable [Line Items]
Term loan maturity date	Jan. 05, 2024
DemeRx Note [Member]
Notes Receivable [Line Items]
Receivables, Maturity terms			5 years
Loans and lease receivable, Outstanding							$ 1,100,000	$ 1,100,000
DemeRx Note [Member] \| DemeRx IB, Inc. [Member]
Notes Receivable [Line Items]
Issuance of common stock shares par value \| $ / shares			$ 0.0001
DemeRx Note [Member] \| DemeRx [Member]
Notes Receivable [Line Items]
Debt Instrument, face amount inclusive other payments			$ 1,000,000.0