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Income Taxes - Details of Significant Components of Net Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net operating loss carryforwards	$ 20,627us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	$ 23,652us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
State income taxes	1us-gaap_DeferredTaxAssetsStateTaxes	1us-gaap_DeferredTaxAssetsStateTaxes
Deferred revenue	4,723us-gaap_DeferredTaxAssetsDeferredIncome	3,588us-gaap_DeferredTaxAssetsDeferredIncome
Research and development and other credits	8,898immr_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndOther	8,201immr_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndOther
Reserves and accruals recognized in different periods	4,803us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	4,994us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Basis difference in investment	968us-gaap_DeferredTaxAssetsInvestments	967us-gaap_DeferredTaxAssetsInvestments
Capitalized R&D expenses	1,576immr_DeferredTaxAssetsCapitalizedRAndDExpenses	1,535immr_DeferredTaxAssetsCapitalizedRAndDExpenses
Depreciation and amortization	783us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment	887us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Other	80us-gaap_DeferredTaxAssetsOther	120us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	42,459us-gaap_DeferredTaxAssetsGross	43,945us-gaap_DeferredTaxAssetsGross
Valuation allowance	(7,663)us-gaap_DeferredTaxAssetsValuationAllowance	(7,095)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets	$ 34,796us-gaap_DeferredTaxAssetsNet	$ 36,850us-gaap_DeferredTaxAssetsNet

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- Definition

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+ References

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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