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v3.8.0.1

Segment Reporting, Geographic Information, and Significant Customers - Additional Information (Detail) - segment | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of reporting segment | 1 |  |
Maximum |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets outside United States of America | 10.00% | 10.00% | 10.00%

X
- Definition The percentage of long-term assets that are outside of a particular country. + References No definition available. + Details
Name: | immr_PercentageOfLongLivedAssetsOutsideCountry
Namespace Prefix: | immr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |