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Prepaid and Other Current Assets - Summary of Prepaid and Other Current Assets (Parenthetical) (Detail) $ in Millions | 1 Months Ended
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Jan. 31, 2024 USD ($)
Prepaid Expense and Other Assets, Current [Abstract] |
Development cost reimbursement received | $ 15.0

X
- Definition Development cost reimbursement received. + References No definition available. + Details
Name: | apls_DevelopmentCostReimbursementReceived
Namespace Prefix: | apls_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration