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Income Taxes (Details 3)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Reconciliation to effective federal income tax rate    
Federal statutory rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Stock based compensation 12.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 4.90%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
State taxes 2.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other permanent differences 5.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Impact of uncertain tax positions 5.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Other (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective federal income tax rate 58.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 43.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations