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Cash, Cash Equivalents, And Marketable Securities - Schedule of Cash, and Cash Equivalents (Parenthetical) (Details) | 9 Months Ended
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Sep. 30, 2024
U.S. government agency securities [Member] | Minimum [Member] |
Cash Cash Equivalents And Marketable Securities [Line Items] |
CollateralRequiredPercentage | 102.00%

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- Definition Cash Cash Equivalents And Marketable Securities [Line Items] + References No definition available. + Details
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Namespace Prefix: | aldx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Collateral Required Percentage + References No definition available. + Details
Name: | aldx_CollateralRequiredPercentage
Namespace Prefix: | aldx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |