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

Represents the number of putative class action lawsuits.

No definition available.

Name:	armp_NumberOfPutativeClassActionLawsuits
Namespace Prefix:	armp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration