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Income Taxes (Details 6) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:        
Inventory $ 5,860us-gaap_DeferredTaxAssetsInventory $ 6,509us-gaap_DeferredTaxAssetsInventory    
Allowance for doubtful accounts 2,342us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 2,255us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts    
Unused investment tax credits 4,665himx_DeferredTaxAssetsUnusedInvestmentTaxCredits 6,017himx_DeferredTaxAssetsUnusedInvestmentTaxCredits    
Unused loss carryforward-regular tax 29,369himx_DeferredTaxAssetsUnusedLossCarryforward 28,098himx_DeferredTaxAssetsUnusedLossCarryforward    
Unused loss carryforward-undistributed earnings tax 11,223himx_DeferredTaxAssetsUnusedLossCarryforwardUndistributedEarnigsTax 10,229himx_DeferredTaxAssetsUnusedLossCarryforwardUndistributedEarnigsTax    
Other 1,604us-gaap_DeferredTaxAssetsOther 1,845us-gaap_DeferredTaxAssetsOther    
Total gross deferred tax assets 55,063us-gaap_DeferredTaxAssetsGross 54,953us-gaap_DeferredTaxAssetsGross    
Less: valuation allowance (40,966)us-gaap_DeferredTaxAssetsValuationAllowance (38,347)us-gaap_DeferredTaxAssetsValuationAllowance (44,995)us-gaap_DeferredTaxAssetsValuationAllowance (44,825)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 14,097us-gaap_DeferredTaxAssetsNet 16,606us-gaap_DeferredTaxAssetsNet    
Deferred tax liabilities:        
Unrealized foreign exchange gain (2,193)us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains (49)us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains    
Advanced share-based compensation deductions (1,600)himx_DeferredTaxLiabilitiesAdvancedSharebasedCompensationDeductions (2,032)himx_DeferredTaxLiabilitiesAdvancedSharebasedCompensationDeductions    
Prepaid pension cost (414)himx_DeferredTaxLiabilitiesPrepaidPensionsCost (396)himx_DeferredTaxLiabilitiesPrepaidPensionsCost    
Acquired intangible assets (1,806)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (2,180)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets    
Other (64)us-gaap_DeferredTaxLiabilitiesOther (70)us-gaap_DeferredTaxLiabilitiesOther    
Total gross deferred tax liabilities (6,077)us-gaap_DeferredIncomeTaxLiabilities (4,727)us-gaap_DeferredIncomeTaxLiabilities    
Net deferred tax assets $ 8,020us-gaap_DeferredTaxAssetsLiabilitiesNet $ 11,879us-gaap_DeferredTaxAssetsLiabilitiesNet