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Accrued expenses and other current liabilities (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Payroll and employee-related costs $ 378,805us-gaap_EmployeeRelatedLiabilitiesCurrent $ 34,218us-gaap_EmployeeRelatedLiabilitiesCurrent
Consumer brand-related costs 179,028us-gaap_AccruedMarketingCostsCurrent 23,635us-gaap_AccruedMarketingCostsCurrent
Research and development costs 91,179flks_AccruedResearchAndDevelopmentExpenseCurrent 125,067flks_AccruedResearchAndDevelopmentExpenseCurrent
Professional fees 81,375us-gaap_AccruedProfessionalFeesCurrent 15,500us-gaap_AccruedProfessionalFeesCurrent
Other 47,137us-gaap_OtherAccruedLiabilitiesCurrent 42,955us-gaap_OtherAccruedLiabilitiesCurrent
Deferred IPO issuance costs 0flks_DeferredIPOIssuanceCostCurrent 175,149flks_DeferredIPOIssuanceCostCurrent
Total $ 777,524flks_AccruedExpensesAndOtherCurrentLiabilities $ 416,524flks_AccruedExpensesAndOtherCurrentLiabilities