Additional Monthly Cash Available After Final Payment For Acquisition

No definition available.

Name:	atrm_AdditionalMonthlyCashAvailableAfterFinalPaymentForAcquisition
Namespace Prefix:	atrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Business Combination, Consideration Transferred, Share Conversion Ratio

+ References

No definition available.

+ Details

Name:	atrm_BusinessCombinationConsiderationTransferredShareConversionRatio
Namespace Prefix:	atrm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Amount Of Debt Eligible For Paid In Kind Interest

+ References

No definition available.

+ Details

Name:	atrm_DebtInstrumentAmountOfDebtEligibleForPaidInKindInterest
Namespace Prefix:	atrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Debt Instrument, Covenant, Annual Review Delivery Period

+ References

No definition available.

+ Details

Name:	atrm_DebtInstrumentCovenantAnnualReviewDeliveryPeriod
Namespace Prefix:	atrm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Covenant, Audited Financial Statements Delivery Period

+ References

No definition available.

+ Details

Name:	atrm_DebtInstrumentCovenantAuditedFinancialStatementsDeliveryPeriod
Namespace Prefix:	atrm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio

+ References

No definition available.

+ Details

Name:	atrm_DebtInstrumentCovenantMinimumDebtServiceCoverageRatio
Namespace Prefix:	atrm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Covenant, Minimum Fixed Leverage Ratio

+ References

No definition available.

+ Details

Name:	atrm_DebtInstrumentCovenantMinimumFixedLeverageRatio
Namespace Prefix:	atrm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit, current, net of deferred financing costs.

+ References

No definition available.

+ Details

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

- Definition

Lumber Surcharge Implemented By The Company

+ References

No definition available.

+ Details

Name:	atrm_LumberSurchargeImplementedByTheCompany
Namespace Prefix:	atrm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

+ Details

Name:	us-gaap_DebtConversionOriginalDebtAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the required periodic payments applied to principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_NetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(a)(4))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30)(a)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_TypeOfArrangementAxis=atrm_KbsLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=atrm_EbglLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=atrm_GerberFinanceIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=atrm_EbglAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=atrm_EbglMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=atrm_UnsecuredPromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atrm_PremierLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=atrm_PremierBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=atrm_KBSBuildersInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atrm_UnsecuredPromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableOtherPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=atrm_ATRMHoldingsInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Financial Position, Liquidity and Capital Resources (Details)		1 Months Ended					12 Months Ended
	Sep. 10, 2018	Nov. 30, 2018 USD ($)	Nov. 30, 2017	Sep. 30, 2017 USD ($)	Jul. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Oct. 04, 2016 USD ($)
Related Party Transaction [Line Items]
Accumulated deficit							$ 88,852,000	$ 80,175,000
Outstanding debt							10,100,000
Post-tax net loss							$ 8,677,000	$ 6,524,000
Annual review delivery period							105 days	105 days
Amount of debt allowing PIK interest						$ 11,000,000
Amount of outstanding debt, including accrued interested, converted to preferred stock				$ 13,300,000
KBS Loan Agreement
Related Party Transaction [Line Items]
Outstanding debt							$ 3,800,000
Line of credit with maximum borrowing availability							$ 4,000,000.0
Cash freed up per month, after final acquisition payment made					$ 100,000
EBGL Loan Agreement
Related Party Transaction [Line Items]
Line of credit with maximum borrowing availability												$ 3,000,000.0	$ 3,000,000.0
Minimum debt service coverage ratio							100.00%
Audited financial statements delivery period							120 days
Gerber Finance Inc
Related Party Transaction [Line Items]
Line of credit with maximum borrowing availability							$ 4,000,000.0
Gerber Finance Inc \| EBGL Acquisition
Related Party Transaction [Line Items]
Outstanding debt							3,000,000
Gerber Finance Inc \| EBGL Loan Agreement
Related Party Transaction [Line Items]
Debt principal amount							2,200,000
EBGL \| Unsecured Promissory Note
Related Party Transaction [Line Items]
Line of credit, current, net of deferred financing costs							1,000,000
Notes payable monthly installment							100,000
Premier Loan Agreement \| Premier Banks
Related Party Transaction [Line Items]
Line of credit with maximum borrowing availability							$ 3,000,000.0
KBS Builders, Inc.
Related Party Transaction [Line Items]
Minimum fixed leverage ratio requirement							700.00%
Post-tax net loss							$ 1,900,000
Lumber surcharge on all new orders			6.00%
Subsequent Event
Related Party Transaction [Line Items]
Debt principal amount									$ 1,400,000.0
Subsequent Event \| EBGL Loan Agreement
Related Party Transaction [Line Items]
Cash freed up per month, after final acquisition payment made		$ 100,000
Subsequent Event \| Unsecured Promissory Note \| Promissory Note
Related Party Transaction [Line Items]
Debt principal amount										$ 900,000.0	$ 500,000.0
ATRM Holdings, Inc. \| Subsequent Event \| Digirad
Related Party Transaction [Line Items]
Consideration conversion ratio (in shares)	0.4