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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Product Information [Line Items] |
Government Subsidy Recognized | $ 0.2

X
- Definition Government Subsidy Recognized + References No definition available. + Details
Name: | immr_GovernmentSubsidyRecognized
Namespace Prefix: | immr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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