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Equity Incentive Plans (Assumptions Used in the Black-Scholes Model) (Details) - Common Stock Options [Member] | 6 Months Ended
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Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($)
Measurement Input, Expected Dividend Rate [Member] |  |
Fair value input, equity securities | 0 | 0
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |
Fair value input, equity securities | 0.0424 | 0.0354
Minimum [Member] | Measurement Input, Price Volatility [Member] |  |
Fair value input, equity securities | 0.894 | 0.9099
Minimum [Member] | Measurement Input, Expected Term [Member] |  |
Fair value input, equity securities | 5.12 | 5.5
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |
Fair value input, equity securities | 0.0425 | 0.042
Maximum [Member] | Measurement Input, Price Volatility [Member] |  |
Fair value input, equity securities | 0.925 | 0.9158
Maximum [Member] | Measurement Input, Expected Term [Member] |  |
Fair value input, equity securities | 7.0 | 7.00

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- Definition Value of input used to measure investment in equity security measured at fair value for the period. + References No definition available. + Details
Name: | armp_EquitySecuritiesMeasurementInput
Namespace Prefix: | armp_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementClassOfStockAxis=armp_CommonStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedDividendRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |