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v3.20.2

Commitments and Contingencies - Additional Information (Detail) | 9 Months Ended
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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%

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- 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

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- 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

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- 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: |