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Income taxes - Schedule of deferred tax assets and liabilities (Details) (USD $)
Dec. 31, 2014
Deferred tax assets:  
U.S. and state net operating loss carryforwards $ 2,708,861us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accruals and other temporary differences 23,829us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Amortization 36,742us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Stock-based compensation 57,120us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Tax credit carryforward 87,762us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Total deferred tax assets 2,914,314us-gaap_DeferredTaxAssetsGross
Less valuation allowance (2,751,295)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets 163,019us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:  
Stock-based compensation (162,779)flks_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Depreciation (240)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Accruals and other temporary differences 0us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals
Deferred tax liabilities 163,019us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet