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Components of Other Current Liabilities - Components of Other Current Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Other Liabilities, Current [Abstract]    
Accrued legal $ 1,992us-gaap_AccruedProfessionalFeesCurrent $ 1,065us-gaap_AccruedProfessionalFeesCurrent
Accrued services 1,128immr_AccruedOtherServicesCurrent 518immr_AccruedOtherServicesCurrent
Income taxes payable 47us-gaap_AccruedIncomeTaxesCurrent 69us-gaap_AccruedIncomeTaxesCurrent
Other current liabilities 611us-gaap_OtherSundryLiabilitiesCurrent 573us-gaap_OtherSundryLiabilitiesCurrent
Total other current liabilities $ 3,778us-gaap_OtherLiabilitiesCurrent $ 2,225us-gaap_OtherLiabilitiesCurrent