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Consolidated Statements of Stockholders' Equity (Parenthetical) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
Issuance cost of common stock | $ 1,148

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- Definition Issuance cost of common stock. + References No definition available. + Details
Name: | alec_IssuanceCostsOfCommonStock
Namespace Prefix: | alec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration