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Income Taxes - Unrecognized Tax Expense (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Unrecognized tax expense rollforward |  |
Unrecognized tax expense, beginning of the year | $ 105,000 | $ 104,000
Decrease related to prior year tax positions | (16,000) | (12,000)
Increase related to current year tax positions | 16,000 | 13,000
Unrecognized tax expense, end of year | 105,000 | 105,000
Interest and penalties on unrecognized tax benefit | $ 155,000 | $ 155,000

X
- Definition Amount of unrecognized tax expenses. + References No definition available. + Details
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Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in unrecognized tax expenses resulting from tax positions that have been or will be taken in current period tax return. + References No definition available. + Details
Name: | mram_UnrecognizedTaxExpensesIncreaseResultingFromCurrentPeriodTaxPositions
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in unrecognized tax expenses resulting from tax positions taken in prior period tax returns. + References No definition available. + Details
Name: | mram_UnrecognizedTaxExpensesIncreaseResultingFromPriorPeriodTaxPositions
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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Period Type: | instant