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Segment Reporting, Geographic Information, and Significant Customers - Summary of Customers Comprising 10% or Greater of Outstanding Accounts and Other Receivable (Parenthetical) (Detail) (Maximum [Member], Outstanding Accounts and Other Receivable [Member]) | Dec. 31, 2014
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Maximum [Member] | Outstanding Accounts and Other Receivable [Member] |
Concentration Risk [Line Items] |
Outstanding accounts and other receivable, percentage | 10.00%immr_EntityWideReceivableMajorCustomerPercentage / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition The amount of accounts receivable from a particular customer as a percentage of entity wide accounts and other receivables. + References No definition available. + Details
Name: | immr_EntityWideReceivableMajorCustomerPercentage
Namespace Prefix: | immr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration