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Leases - Schedule of Undiscounted future non-cancellable lease payments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Future lease payments |  |
Remainder of 2025 | $ 370 |
2026 | 1,497 |
2027 | 1,380 |
2028 | 595 |
Thereafter | 48 |
Total lease payments | 3,890 |
Less: imputed interest | (222) |
Total lease liabilities | 3,668 |
Lease liabilities, current portion | (1,361) | $ (1,306)
Total lease liabilities, net of current portion | $ 2,307 | $ 3,336

X
- Definition Present value of lessee's discounted obligation for lease payments from leases. + References No definition available. + Details
Name: | mram_LeaseLiability
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Present value of lessee's discounted obligation for lease payments from leases, classified as current. + References No definition available. + Details
Name: | mram_LeaseLiabilityCurrent
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Present value of lessee's discounted obligation for lease payments from lease, classified as noncurrent. + References No definition available. + Details
Name: | mram_LeaseLiabilityNoncurrent
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's undiscounted obligation for lease payments for leases. + References No definition available. + Details
Name: | mram_LesseeLeaseLiabilityPaymentsDue
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's undiscounted obligation for lease payments for lease, due in third fiscal year following latest fiscal year. + References No definition available. + Details
Name: | mram_LesseeLeaseLiabilityPaymentsDueYearThree
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's undiscounted obligation for lease payment for lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | mram_LesseeLeaseLiabilityToBePaidAfterYearFour
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's undiscounted obligation for lease payment for lease to be paid in next fiscal year following current fiscal year. + References No definition available. + Details
Name: | mram_LesseeLeaseLiabilityToBePaidYearOne
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for leases. + References No definition available. + Details
Name: | mram_LesseeLeaseLiabilityUndiscountedExcessAmount
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's undiscounted obligation for lease payments for lease, due in second fiscal year following latest fiscal year. + References No definition available. + Details
Name: | mram_LesseeLiabilityPaymentsDueYearTwo
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's undiscounted obligation for lease payments for lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year. + References No definition available. + Details
Name: | mram_LesseeLiabilityPaymentsRemainderOfFiscalYear
Namespace Prefix: | mram_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LesseeDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration