Represents the terms related with expiration of warrants.

No definition available.

Name:	armp_WarrantExpirationDate
Namespace Prefix:	armp_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of securities called by warrants that were exercised during the period.

+ References

No definition available.

+ Details

Name:	armp_WarrantsExercisedDuringPeriod
Namespace Prefix:	armp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=armp_AmpliphiBiosciencesCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=armp_ExercisePrice120.00IMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=armp_ExercisePrice107.50Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=armp_ExercisePrice40.50Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=armp_ExercisePrice22.50Member
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=armp_ExercisePrice0.32Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=armp_ExercisePrice1.50Member
Namespace Prefix:
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Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=armp_ExercisePrice0.40Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=armp_ExercisePrice0.01Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=armp_PublicOfferingOfWarrantsAndCommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=armp_PreFundedWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Capital Stock and Warrants (Summary of Warrants Outstanding) (Details) - $ / shares	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Oct. 16, 2018	Oct. 14, 2018	May 10, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants				1,854,262
AmpliPhi Biosciences Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	26,961,187	26,961,187
Warrants exercised		217,400	226,664
AmpliPhi Biosciences Corporation [Member] \| Exercise Price 120.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	16,984	16,984
Exercise Price	$ 120.00	$ 120.00
Warrant Expiration Date		Mar. 01, 2019
AmpliPhi Biosciences Corporation [Member] \| Exercise Price 107.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	41,872	41,872
Exercise Price	$ 107.50	$ 107.50
Warrant Expiration Date		Mar. 16, 2020
AmpliPhi Biosciences Corporation [Member] \| Exercise Price 40.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	31,519	31,519
Exercise Price	$ 40.50	$ 40.50
Warrant Expiration Date		Mar. 31, 2021
AmpliPhi Biosciences Corporation [Member] \| Exercise Price 22.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	106,381	106,381
Exercise Price	$ 22.50	$ 22.50
Warrant Expiration Date		Jun. 03, 2021
AmpliPhi Biosciences Corporation [Member] \| Exercise Price 0.32 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	168,498	168,498
Exercise Price	$ 0.32	$ 0.32			$ 0.32	$ 0.57
Warrant Expiration Date		Nov. 22, 2021
AmpliPhi Biosciences Corporation [Member] \| Exercise Price 1.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	7,920,933	7,920,933
Exercise Price	$ 1.50	$ 1.50
Warrant Expiration Date		May 10, 2022
AmpliPhi Biosciences Corporation [Member] \| Exercise Price 0.40 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	17,500,000	17,500,000
Exercise Price	$ 0.40	$ 0.40
Warrant Expiration Date		Oct. 15, 2023
AmpliPhi Biosciences Corporation [Member] \| Exercise Price 0.01 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	1,175,000	1,175,000
Exercise Price	$ 0.01	$ 0.01
Warrant Expiration Date		Oct. 15, 2023
Warrants exercised	950,000
AmpliPhi Biosciences Corporation [Member] \| Public Offering of Warrants and Common Stock [Member] \| Pre-Funded Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price					$ 0.01		$ 0.01
Number of securities called by warrants					2,125,000		4,483,334