Existing End Of Term Charge

No definition available.

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Namespace Prefix:	aldx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line of credit facility, commitment charge.

+ References

No definition available.

+ Details

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- Definition

Line of credit facility interest payment extension period.

+ References

No definition available.

+ Details

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- Definition

Line of credit facility interest payment period.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The percentage of fee if the term loan is prepaid.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Line of credit facility, transaction costs.

+ References

No definition available.

+ Details

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

- Definition

Loan agreement right to purchase aggregate amount of equity securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	aldx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Loan funded prior to the date of amendment.

+ References

No definition available.

+ Details

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Namespace Prefix:	aldx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Supplemental End Of Term Charge

+ References

No definition available.

+ Details

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

- 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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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Net increase or decrease in the carrying amount of the debt instrument for the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

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

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Description of long-term debt arrangements, which are debt arrangements that originally require full repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer, and disclosures pertaining to the underlying arrangements, including repayment terms, conversion features, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements. Types of long-term debt arrangements include borrowing under notes payable, bonds payable, debentures, term loans, and other contractual obligations for payment.

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

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Credit Facility - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Apr. 20, 2021	Dec. 22, 2022	Dec. 31, 2022
Line Of Credit Facility [Line Items]
Proceeds from Long-term lines of credit			$ 16,335,000
Hercules Credit Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility amount	$ 35,000,000		$ 60,000,000.0
Debt instrument annual interest rate			9.10%
Interest payment period			May 01, 2021
Interest payment extension period		Oct. 01, 2024	May 01, 2023
Commitment charge			$ 25,000
Transaction costs			273,186
Credit facility fee			$ 375,000
Credit facility prepayment fee percentage		0.75%	0.75%
Credit facility, interest rate			13.20%
Loan funded prior to the date of amendment			$ 15,000,000
Long term debt maturity		extended the Maturity Date from October 1, 2023 to October 1, 2024; (iii) extended the availability of the Fourth Loan Tranche commitment of $20 million from May 1, 2023 to May 1, 2024
Long term debt percentage		0.00%	0.00%
Supplemental term charge		$ 292,500
Existing term charge		1,042,500
Hercules Credit Facility [Member] \| Maximum [Member]
Line Of Credit Facility [Line Items]
Loan agreement right to purchase aggregate amount of equity securities			$ 2,000,000.0
Hercules Credit Facility [Member] \| Prime Rate [Member]
Line Of Credit Facility [Line Items]
Debt instrument variable annual interest rate			3.10%
Hercules Credit Facility [Member] \| Term Loan Advance One [Member]
Line Of Credit Facility [Line Items]
Credit facility amount			$ 5,000,000.0
Hercules Credit Facility [Member] \| Term Loan Advance Four [Member]
Line Of Credit Facility [Line Items]
Proceeds from Long-term lines of credit		$ 20	15,000,000.0
Hercules Credit Facility [Member] \| Term Loan Advance Five [Member]
Line Of Credit Facility [Line Items]
Proceeds from Long-term lines of credit	10,000,000.0		$ 10,000,000.0
Debt instrument, increase amount	$ 20,000,000.0