Summary of Significant Accounting Policies - Schedule of Employee Retention Tax Credit (Details) $ in Millions	3 Months Ended
Jun. 30, 2023 USD ($)
Summary of Significant Accounting Policies
Proceeds from employee retention tax credit refunds	$ 2.0

The amount of cash received during the period as refunds related to employee retention tax credit.

No definition available.

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