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Other Revenue (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 07, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Other revenue [Abstract] |  |  |  |  |  |
Recognition of deferred revenue |  | $ 0.0 | $ 0.3 | $ 0.9 | $ 0.9 |
Revenue recognized |  | 0.0 |  | 0.1 |  |
Upfront payment | $ 35.0 |  |  |  |  |
Other revenue - current liability |  | 0.2 |  | 0.2 |  | $ 0.9
Long-term license revenue deferred |  | $ 35.0 |  | $ 35.0 |  |

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

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

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- Definition Recognition of deferred revenue. + References No definition available. + Details
Name: | atnm_RecognitionOfDeferredRevenue1
Namespace Prefix: | atnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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