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v3.24.1

Equity Incentive Plans (Assumptions Used in the Black-Scholes Model) (Details) - Common Stock Options [Member] | 12 Months Ended
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Dec. 31, 2023 Y | Dec. 31, 2022 Y
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 |  | 2.65
Minimum [Member] | Measurement Input, Price Volatility [Member] |  |
Fair value input, equity securities | 75.40 | 81.81
Minimum [Member] | Measurement Input, Expected Term [Member] |  |
Fair value input, equity securities | 0.12 | 5.50
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |
Fair value input, equity securities | 5.54 | 4.20
Maximum [Member] | Measurement Input, Price Volatility [Member] |  |
Fair value input, equity securities | 116.96 | 85.86
Maximum [Member] | Measurement Input, Expected Term [Member] |  |
Fair value input, equity securities | 7.00 | 7.00

X
- 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

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

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

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

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

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

X
- 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: |