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Income Taxes (Details 1)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Percent of pre-tax income:    
U.S. federal statutory income tax rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Warrant liability and preferred stock conversion liability (54.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost (24.80%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Other permanent differences 1.00%aphb_EffectiveIncomeTaxRateReconciliationPermanentDifferences (2.10%)aphb_EffectiveIncomeTaxRateReconciliationPermanentDifferences
State taxes, net of federal benefit 3.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Change in valuation allowance 16.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (10.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective income tax rate 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations