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Uncompleted Construction Contracts - Narrative (Details) $ in Millions	Dec. 31, 2017 USD ($)
Contractors [Abstract]
Amount of remaining contract	$ 8.2

X

- Definition

Amount Of Remaining Contract.

+ References

No definition available.

+ Details

Name:	atrm_AmountOfRemainingContract
Namespace Prefix:	atrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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