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CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024
Series C redeemable convertible preferred stock
Derivative liability		$ 14,319	$ 8,913
Offering costs		$ 157	$ 382
Voting common stock
Number of common shares issued upon conversion of temporary equity	28,855,656
Non-voting common stock
Number of common shares issued upon conversion of temporary equity	7,184,908
IPO
Underwriting discounts and commissions and other offering costs	$ 16,684

X

- Definition

Represents the number of common shares issued upon conversion of temporary equity to permanent equity.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The amount of derivative liability from issuance of temporary stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	alms_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of offering costs on issue of temporary equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	alms_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

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- Details

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X

- Details

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- Details

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- Details

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