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Segment Reporting, Geographic Information, and Significant Customers - Schedule of Revenue by Market Areas (Detail) (Net Revenues [Member], Market [Member])
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Concentration Risk [Line Items]      
Revenues by product and market area, in percentage 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1
Mobile, Wearables, and Consumer [Member]
      
Concentration Risk [Line Items]      
Revenues by product and market area, in percentage 60.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_MobileWearablesMember		 66.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_MobileWearablesMember		 46.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_MobileWearablesMember
Gaming Devices [Member]
      
Concentration Risk [Line Items]      
Revenues by product and market area, in percentage 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_GamingMember		 21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_GamingMember		 28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_GamingMember
Automotive [Member]
      
Concentration Risk [Line Items]      
Revenues by product and market area, in percentage 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_AutomotiveMember		 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_AutomotiveMember		 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_AutomotiveMember
Medical [Member]
      
Concentration Risk [Line Items]      
Revenues by product and market area, in percentage 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_MedicalMember		 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_MedicalMember		 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_MedicalMember
Other [Member]
      
Concentration Risk [Line Items]      
Revenues by product and market area, in percentage 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_OtherMarketMember		 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_OtherMarketMember		 4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= immr_MarketConcentrationRiskMember
/ us-gaap_ProductOrServiceAxis
= immr_OtherMarketMember