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Other Current Liabilities - Schedule of Other Current Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Liabilities, Current [Abstract]    
Accrued legal $ 1,065us-gaap_AccruedProfessionalFeesCurrent $ 780us-gaap_AccruedProfessionalFeesCurrent
Accrued services 518immr_AccruedOtherServicesCurrent 226immr_AccruedOtherServicesCurrent
Income taxes payable 69us-gaap_AccruedIncomeTaxesCurrent 41us-gaap_AccruedIncomeTaxesCurrent
Other current liabilities 573us-gaap_OtherSundryLiabilitiesCurrent 606us-gaap_OtherSundryLiabilitiesCurrent
Total other current liabilities $ 2,225us-gaap_OtherLiabilitiesCurrent $ 1,653us-gaap_OtherLiabilitiesCurrent