Area real estate property covered under the operating lease.

No definition available.

Name:	mram_AreaOfOperatingLease
Namespace Prefix:	mram_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of a lease termination fee expensed related to a lease termination agreement.

+ References

No definition available.

+ Details

Name:	mram_LeaseTerminationFee
Namespace Prefix:	mram_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the notice period to cancel lease.

+ References

No definition available.

+ Details

Name:	mram_OperatingLeasesCancellationPeriodUponNotice
Namespace Prefix:	mram_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of unamortized deferred rent that has been written off.

+ References

No definition available.

+ Details

Name:	mram_WriteOffOfUnamortizedDeferredRent
Namespace Prefix:	mram_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

For a classified balance sheet, the cumulative difference as of the balance sheet date between the payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, within one year of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DeferredRentCreditCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=mram_PreviousHeadquarterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=mram_ArizonaManufacturingFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Commitments (Details)	1 Months Ended	6 Months Ended	12 Months Ended
Commitments and Commitments (Details)	Apr. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($) ft²
Commitments and Contingencies
Deferred rent		$ 322,000	$ 230,000
Previous Headquarters
Commitments and Contingencies
Area of operating lease (in sq feet) \| ft²			27,974
Write off of unamortized deferred rent	$ 18,000
Lease termination fee	$ 43,000
Arizona manufacturing facility
Commitments and Contingencies
Period to cancel lease upon notice		24 months