XML 86 R54.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Subsequent Events - Additional Information (Details) - Subsequent Event [Member] $ / shares in Units, $ in Millions | Jan. 17, 2024 USD ($) $ / shares shares
--- | ---
Underwriting [Member] |
Subsequent Event [Line Items] |
Date of underwriting | Jan. 17, 2024
Number of shares issued or sold | shares | 10,869,566
Share of common stock issued or sold, Price per share | $ / shares | $ 6.57
Option period (in days) | 30 days
Aggregate gross proceeds from the offering | $ | $ 75.0
Amount on underwriting discounts and commissions and offering expenses | $ | $ 3.9
Offering closing date | Jan. 19, 2024
Over-Allotment Option [Member] |
Subsequent Event [Line Items] |
Number of shares issued or sold | shares | 1,630,434

X
- Definition Amount on underwriting discounts and commissions and offering expenses. + References No definition available. + Details
Name: | alec_AmountOnUnderwritingDiscountsAndCommissionsAndOfferingExpenses
Namespace Prefix: | alec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Offering closing date. + References No definition available. + Details
Name: | alec_SaleOfStockClosingDate
Namespace Prefix: | alec_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sale Of Stock, Option, Term. + References No definition available. + Details
Name: | alec_SaleOfStockOptionTerm
Namespace Prefix: | alec_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
Name: | us-gaap_ProceedsFromIssuanceInitialPublicOffering
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date the subsidiary or equity investee issued or sold stock, in YYYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_SaleOfStockTransactionDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483399/855-10-50-2 + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=alec_UnderwritingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |