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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data | Total | Common Stock and Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Deficit [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2011 | $ 37,891 us-gaap_StockholdersEquity | $ 182,508 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | $ 118 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (119,887)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (24,848)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Beginning balance, shares at Dec. 31, 2011 |  | 31,786,030 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  | 3,928,206 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net income (loss) | (7,197)us-gaap_NetIncomeLoss |  |  | (7,197)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Unrealized gain (loss) on available-for-sale securities, net of taxes | (9)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |  | (9)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Repurchase of stock | (5,721)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  | (5,721)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Repurchase of stock, shares | 1,054,538 us-gaap_TreasuryStockSharesAcquired |  |  |  | 1,054,538 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Issuance of stock for ESPP purchase | 122 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 122 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Issuance of stock for ESPP purchase, shares |  | 25,628 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Exercise of stock options | 1,046 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 1,046 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Exercise of stock options, shares |  | 231,403 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Release of restricted stock units and awards | 1,299 immr_StockIssuedDuringPeriodValueRestrictedStockUnitsAndAwardNetOfForfeitures | 1,299 immr_StockIssuedDuringPeriodValueRestrictedStockUnitsAndAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Release of restricted stock units and awards, shares |  | 235,269 immr_StockIssuedDuringPeriodSharesRestrictedStockUnitsAndAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Stock based compensation | 1,847 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 1,847 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Ending balance at Dec. 31, 2012 | 29,278 us-gaap_StockholdersEquity | 186,822 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 109 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (127,084)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (30,569)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance, shares at Dec. 31, 2012 |  | 32,278,330 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  | 4,982,744 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net income (loss) | 40,155 us-gaap_NetIncomeLoss |  |  | 40,155 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Unrealized gain (loss) on available-for-sale securities, net of taxes | 3 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |  | 3 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Repurchase of stock, shares | 0 us-gaap_TreasuryStockSharesAcquired |  |  |  |
Issuance of stock for ESPP purchase | 198 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 198 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Issuance of stock for ESPP purchase, shares |  | 36,921 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Exercise of stock options | 6,393 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 6,393 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Exercise of stock options, shares |  | 956,633 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Release of restricted stock units and awards | 3,482 immr_StockIssuedDuringPeriodValueRestrictedStockUnitsAndAwardNetOfForfeitures | 3,482 immr_StockIssuedDuringPeriodValueRestrictedStockUnitsAndAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Release of restricted stock units and awards, shares |  | 347,882 immr_StockIssuedDuringPeriodSharesRestrictedStockUnitsAndAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Stock based compensation | 1,162 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 1,162 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Ending balance at Dec. 31, 2013 | 80,671 us-gaap_StockholdersEquity | 198,057 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 112 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (86,929)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (30,569)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance, shares at Dec. 31, 2013 |  | 33,619,766 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  | 4,982,744 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net income (loss) | 4,123 us-gaap_NetIncomeLoss |  |  | 4,123 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Unrealized gain (loss) on available-for-sale securities, net of taxes | (10)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |  | (10)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Repurchase of stock | (15,000)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  | (15,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Repurchase of stock, shares | 1,527,647 us-gaap_TreasuryStockSharesAcquired |  |  |  | 1,527,647 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Issuance of stock for ESPP purchase | 381 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 381 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Issuance of stock for ESPP purchase, shares |  | 38,298 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Exercise of stock options | 1,304 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 1,304 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Exercise of stock options, shares |  | 205,744 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Release of restricted stock units and awards | 3,976 immr_StockIssuedDuringPeriodValueRestrictedStockUnitsAndAwardNetOfForfeitures | 3,976 immr_StockIssuedDuringPeriodValueRestrictedStockUnitsAndAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Release of restricted stock units and awards, shares |  | 361,970 immr_StockIssuedDuringPeriodSharesRestrictedStockUnitsAndAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Tax benefit/(deficiency) from the stock incentive plans | (161)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet | (161)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Stock based compensation | 1,319 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 1,319 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |
Ending balance at Dec. 31, 2014 | $ 76,603 us-gaap_StockholdersEquity | $ 204,876 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | $ 102 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (82,806)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (45,569)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance, shares at Dec. 31, 2014 |  | 34,225,778 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  | 6,510,391 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember

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