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Commitments and Contingencies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2023 USD ($)
Commitments And Contingencies [Line Items] |
Incurred any cost to defend lawsuits or settle claims | $ 0
Vehicles [Member] |
Commitments And Contingencies [Line Items] |
Operating lease, term of contract | 36 months
Bachem Americas, Inc [Member] |
Commitments And Contingencies [Line Items] |
Non-cancellable purchase obligation substance over period | 5 years
Non-cancellable purchase commitments | $ 94,600,000
Other non-cancellable purchase commitments | $ 16,100,000

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- Definition Commitments and contingencies. + References No definition available. + Details
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Namespace Prefix: | apls_
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Balance Type: | na
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- Definition Non cancellable purchase obligation substance over period. + References No definition available. + Details
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Namespace Prefix: | apls_
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Period Type: | duration

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |