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

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- Definition

Issuance cost of common stock.

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No definition available.

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Name:	alec_IssuanceCostsOfCommonStock
Namespace Prefix:	alec_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration