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

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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