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CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash $ 110,522,454us-gaap_Cash $ 33,854,153us-gaap_Cash
Prepaid expenses and other current assets 1,054,674us-gaap_PrepaidExpenseAndOtherAssetsCurrent 370,396us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 111,577,128us-gaap_AssetsCurrent 34,224,549us-gaap_AssetsCurrent
Property and equipment, net 104,516us-gaap_PropertyPlantAndEquipmentNet 85,144us-gaap_PropertyPlantAndEquipmentNet
Deferred IPO issuance costs 0us-gaap_DeferredFinanceCostsNoncurrentNet 1,074,794us-gaap_DeferredFinanceCostsNoncurrentNet
Deferred tax assets 50,103us-gaap_DeferredTaxAssetsNetNoncurrent 50,103us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets 85,200us-gaap_OtherAssetsNoncurrent 50,000us-gaap_OtherAssetsNoncurrent
Restricted cash 126,835us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 126,808us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Total assets 111,943,782us-gaap_Assets 35,611,398us-gaap_Assets
Current liabilities:    
Accounts payable 567,893us-gaap_AccountsPayableCurrent 578,653us-gaap_AccountsPayableCurrent
Accrued expenses and other current liabilities 777,524flks_AccruedExpensesAndOtherCurrentLiabilities 416,524flks_AccruedExpensesAndOtherCurrentLiabilities
Deferred tax liabilities 50,103us-gaap_DeferredTaxLiabilitiesCurrent 50,103us-gaap_DeferredTaxLiabilitiesCurrent
Deferred rent, current portion 21,881us-gaap_DeferredRentCreditCurrent 21,881us-gaap_DeferredRentCreditCurrent
Total current liabilities 1,417,401us-gaap_LiabilitiesCurrent 1,067,161us-gaap_LiabilitiesCurrent
Deferred rent, net of current portion 29,748us-gaap_DeferredRentCreditNoncurrent 35,968us-gaap_DeferredRentCreditNoncurrent
Other long term liabilities 415,442us-gaap_OtherLiabilitiesNoncurrent 15,442us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 1,862,591us-gaap_Liabilities 1,118,571us-gaap_Liabilities
Convertible preferred stock:    
Preferred stock, carrying value 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Stockholders' equity (deficit):    
Common stock, $0.0001 par value; 100,000,000 and 61,000,000 shares authorized at March 31, 2015 and December 31, 2014, respectively, 17,933,664 and 5,434,301 shares issued at March 31, 2015 and December 31, 2014, respectively, and 14,932,098 and 2,215,711 shares outstanding at March 31, 2015 and December 31, 2014, respectively 1,493us-gaap_CommonStockValue 221us-gaap_CommonStockValue
Additional paid-in capital 124,108,139us-gaap_AdditionalPaidInCapital 1,472,299us-gaap_AdditionalPaidInCapital
Accumulated deficit (14,028,441)us-gaap_RetainedEarningsAccumulatedDeficit (8,010,860)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity (deficit) 110,081,191us-gaap_StockholdersEquity (6,538,340)us-gaap_StockholdersEquity
Total liabilities, convertible preferred stock and stockholders' equity (deficit) 111,943,782us-gaap_LiabilitiesAndStockholdersEquity 35,611,398us-gaap_LiabilitiesAndStockholdersEquity
Series A convertible preferred stock    
Convertible preferred stock:    
Preferred stock, carrying value 0us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 15,637,032us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Series B Preferred Stock    
Convertible preferred stock:    
Preferred stock, carrying value $ 0us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 $ 25,394,135us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember