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Prepaid and Other Current Assets - Summary of Prepaid and Other Current Assets (Parenthetical) (Detail) $ in Millions	1 Months Ended
	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