CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 49,326	$ 226,651
Marketable securities	201,434	90,328
Prepaid expenses and other current assets	5,578	6,692
Total current assets	256,338	323,671
Property and equipment, net	199	310
Restricted cash equivalents	986	985
Operating lease right-of-use assets	4,541	5,181
Deposits And Other Assets	2,500	2,498
Total assets	264,564	332,645
Current liabilities:
Accounts payable	5,533	3,519
Accrued expenses	14,609	17,910
Operating lease liabilities, current portion	1,008	1,259
Total current liabilities	21,150	22,688
Operating lease liabilities, net of current portion	4,247	4,698
Total liabilities	25,397	27,386
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued and outstanding
Common stock, $0.0001 par value; 300,000,000 shares authorized; 111,368,283 and 109,884,502 shares issued and outstanding as of June 30, 2026 and December 31, 2025, respectively	11	11
Additional paid-in capital	1,075,271	1,056,271
Accumulated deficit	(836,134)	(751,427)
Accumulated other comprehensive income	19	404
Total stockholders' equity	239,167	305,259
Total liabilities and stockholders' equity	$ 264,564	$ 332,645

Deposits and other assets.

No definition available.

Name:	amlx_DepositsAndOtherAssets
Namespace Prefix:	amlx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).