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v3.23.1

Subsequent Event (Details) shares in Millions, $ in Millions | Mar. 31, 2023 USD ($) shares
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Subsequent Events [Abstract] |
Shares of common stock value | shares | 0.6
Net proceeds | $ | $ 5.6

X
- Definition Amount of net proceeds. + References No definition available. + Details
Name: | atnm_NetProceeds
Namespace Prefix: | atnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Shares of common stock value. + References No definition available. + Details
Name: | atnm_SharesOfCommonStockValue
Namespace Prefix: | atnm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_SubsequentEventsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration