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Other Revenue (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
May 31, 2022 | Jun. 30, 2023 | Dec. 31, 2022
Other revenue [Abstract] |  |  |
Revenue recognized |  | $ 0.9 |
Other revenue |  | 0.1 |
Upfront payment | $ 35.0 |  |
Long-term license revenue deferred |  | $ 35.0 | $ 35.0

X
- Definition The amount of long-term license revenue deferred. + References No definition available. + Details
Name: | atnm_LongtermLicenseRevenueDeferred
Namespace Prefix: | atnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of revenue recognized. + References No definition available. + Details
Name: | atnm_RevenueRecognized
Namespace Prefix: | atnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Upfront payment. + References No definition available. + Details
Name: | atnm_UpfrontPayment
Namespace Prefix: | atnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DeferredRevenueCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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