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FAIR VALUE MEASUREMENTS - Warrants (Details) - shares |  | 3 Months Ended
--- | --- | ---
Jun. 27, 2022 | Mar. 31, 2024
Common And Pre-Funded Warrants |  |
Warrants |  |
Issuance of warrants (in shares) |  | 2,000,000
Pre-Funded Warrants |  |
Warrants |  |
Issuance of warrants (in shares) |  | 2,000,000
June 2022 Offering | Common Warrants |  |
Warrants |  |
Issuance of warrants (in shares) | 30,000,000 |
June 2022 Offering | Pre-Funded Warrants |  |
Warrants |  |
Issuance of warrants (in shares) | 10,000,000 |

X
- Definition Number of warrants issued during the period. Excludes warrants issued from exchange of common stock. + References No definition available. + Details
Name: | aplt_WarrantsIssued
Namespace Prefix: | aplt_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=aplt_PreFundedAndCommonWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=aplt_PreFundedWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=aplt_June2022OfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=aplt_CommonWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |