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WARRANTS - Warrant Activity (Details) | 3 Months Ended
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Mar. 31, 2024 shares
Common And Pre-Funded Warrants |
Warrants |
Outstanding as of beginning of period (in shares) | 51,533,652
Warrants granted and issued (in shares) | 2,000,000
Warrants exercised (in shares) | (13,231,976)
Outstanding as of end of period (in shares) | 40,301,676
Pre-Funded Warrants - Equity Classified Warrants |
Warrants |
Outstanding as of beginning of period (in shares) | 31,783,652
Warrants granted and issued (in shares) | 2,000,000
Warrants exercised (in shares) | (4,206,976)
Outstanding as of end of period (in shares) | 29,576,676
Common Warrants - Liability Classified Warrants |
Warrants |
Outstanding as of beginning of period (in shares) | 19,750,000
Warrants exercised (in shares) | (9,025,000)
Outstanding as of end of period (in shares) | 10,725,000

X
- Definition Number of warrants exercised during the period. + References No definition available. + Details
Name: | aplt_WarrantsExercised
Namespace Prefix: | aplt_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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_ClassOfWarrantOrRightAxis=aplt_CommonWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |