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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Line Items]      
Excess tax benefit from stock-based compensation $ 7,985,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities $ 6,797,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities $ 4,713,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Deferred tax assets 100,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal    
Deferred tax assets 200,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic    
R&D credit carry forwards carry forwards expiration period various dates between 2018 and 2028    
Minimum tax credit carryover 1,100,000us-gaap_TaxCreditCarryforwardAmount    
Credit to additional paid-in capital 7,985,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation 6,797,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation 4,713,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Income tax receivable 1,300,000us-gaap_IncomeTaxReceivable 2,300,000us-gaap_IncomeTaxReceivable  
Research and development tax credit studies 10,400,000us-gaap_IncomeTaxReconciliationTaxCreditsResearch    
Liability for unrecognized tax benefits   3,122,000us-gaap_UnrecognizedTaxBenefits  
Threshold to favorably impact effective tax rate 3,300,000tasr_UnrecognizedTaxBenefitsThresholdtoFavorablyImpactEffectiveTaxRate    
Unrecognized tax benefits, accrued interest 46,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 12,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued  
Expiring in Two Thousand Ninteen      
Income Tax Disclosure [Line Items]      
Minimum tax credit carryover 1,200,000us-gaap_TaxCreditCarryforwardAmount
/ tasr_TaxPeriodAxis
= tasr_ExpiringinTwoThousandNinteenMember		    
State      
Income Tax Disclosure [Line Items]      
NOL carry forward expiration date various dates between 2016 and 2031    
Liability for unrecognized tax benefits 200,000us-gaap_UnrecognizedTaxBenefits
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
State | ARIZONA      
Income Tax Disclosure [Line Items]      
State research and development credit carry forwards 3,200,000tasr_StateResearchAndDevelopmentCreditCarryForwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementGeographicalAxis
= stpr_AZ		    
State | CALIFORNIA      
Income Tax Disclosure [Line Items]      
State research and development credit carry forwards $ 200,000tasr_StateResearchAndDevelopmentCreditCarryForwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		    
Federal | CALIFORNIA      
Income Tax Disclosure [Line Items]      
NOL carry forward expiration date between 2031 and 2033