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Commitments and Contingencies (Narrative) (Details) | Apr. 25, 2019 lawsuit
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Commitments and Contingencies [Abstract] |
Number of putative class action lawsuits | 3

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- Definition Represents the number of putative class action lawsuits. + References No definition available. + Details
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Namespace Prefix: | armp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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