XML 61 R53.htm IDEA: XBRL DOCUMENT
v3.26.1

Stockholders' Equity - Summary of Pre-funded Warrants Activity (Details) - Pre-funded Warramts - shares | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Class of Warrant or Right [Line Items] |  |
Outstanding as of December 31, 2025 | 1,250,000 |
Issued | 18,574,120 | 1,250,000
Exercised | (2,563,507) |
Outstanding as of March 31, 2026 | 17,260,613 | 1,250,000

X
- Definition Warrants exercised during period. + References No definition available. + Details
Name: | alxo_WarrantsExercisedDuringPeriod
Namespace Prefix: | alxo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrants to purchase shares of common stock. + References No definition available. + Details
Name: | alxo_WarrantsToPurchaseSharesOfCommonStock
Namespace Prefix: | alxo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=alxo_PreFundedWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |