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Subsequent Events - Additional Information (Details) $ in Millions | 1 Months Ended
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Feb. 28, 2023 USD ($)
Subsequent Event | AbbVie Biotechnology Limited |
Subsequent Event [Line Items] |
Milestone payment receivable | $ 17.8

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- Definition Milestone Payment Receivable + References No definition available. + Details
Name: | alec_MilestonePaymentReceivable
Namespace Prefix: | alec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=alec_AbbVieBiotechnologyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |