CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 240,095	$ 226,651
Marketable securities	528,037	90,328
Prepaid expenses and other current assets	10,726	6,692
Total current assets	778,858	323,671
Property and equipment, net	191	310
Restricted cash equivalents	997	985
Operating lease right-of-use assets	4,249	5,181
Deposits And Other Assets	2,500	2,498
Total assets	786,795	332,645
Current liabilities:
Accounts payable	4,803	3,519
Accrued expenses	23,313	17,910
Operating lease liabilities, current portion	932	1,259
Total current liabilities	29,048	22,688
Operating lease liabilities, net of current portion	4,011	4,698
Total liabilities	33,059	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; 128,544,202 and 109,884,502 shares issued and outstanding as of September 30, 2026 and December 31, 2025, respectively	13	11
Additional paid-in capital	1,635,525	1,056,271
Accumulated deficit	(881,623)	(751,427)
Accumulated other comprehensive income	(179)	404
Total stockholders' equity	753,736	305,259
Total liabilities and stockholders' equity	$ 786,795	$ 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).