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Commitments and Contingencies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2020 USD ($)
Commitments And Contingencies [Line Items]
Estimated termination costs and other fees	$ 2,100,000
Non-cancellable purchase commitments	$ 3,100,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Payment of royalty fees	3.00%
Maximum [Member]
Commitments And Contingencies [Line Items]
Future milestone payments	$ 15,000,000.0
Payment of royalty fees	6.00%

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

Name:	apls_CommitmentsAndContingenciesLineItems
Namespace Prefix:	apls_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Estimated termination costs and other fees.

+ References

No definition available.

+ Details

Name:	apls_EstimatedTerminationCostsAndOtherFees
Namespace Prefix:	apls_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Future milestone payments.

+ References

No definition available.

+ Details

Name:	apls_FutureMilestonePayments
Namespace Prefix:	apls_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of royalty fees payments.

+ References

No definition available.

+ Details

Name:	apls_PercentageOfRoyaltyFeesPayments
Namespace Prefix:	apls_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: