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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Current assets:      
Cash and cash equivalents $ 127,030us-gaap_CashAndCashEquivalentsAtCarryingValue $ 35,517us-gaap_CashAndCashEquivalentsAtCarryingValue $ 9,935us-gaap_CashAndCashEquivalentsAtCarryingValue
Prepaid expenses and other current assets 1,221us-gaap_PrepaidExpenseAndOtherAssetsCurrent 224us-gaap_PrepaidExpenseAndOtherAssetsCurrent 389us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Tax incentive receivable 1,218us-gaap_IncomeTaxesReceivable 1,617us-gaap_IncomeTaxesReceivable  
Total current assets 129,469us-gaap_AssetsCurrent 37,358us-gaap_AssetsCurrent 10,324us-gaap_AssetsCurrent
Tax incentive receivable     630us-gaap_IncomeTaxesReceivableNoncurrent
Property and equipment, net 69us-gaap_PropertyPlantAndEquipmentNet 37us-gaap_PropertyPlantAndEquipmentNet 32us-gaap_PropertyPlantAndEquipmentNet
Other assets 98us-gaap_OtherAssetsNoncurrent 743us-gaap_OtherAssetsNoncurrent  
Total assets 129,636us-gaap_Assets 38,138us-gaap_Assets 10,986us-gaap_Assets
Current liabilities:      
Accounts payable 1,052us-gaap_AccountsPayableCurrent 2,015us-gaap_AccountsPayableCurrent 1,231us-gaap_AccountsPayableCurrent
Accrued expenses 9,885us-gaap_AccruedLiabilitiesCurrent 900us-gaap_AccruedLiabilitiesCurrent 1,699us-gaap_AccruedLiabilitiesCurrent
Notes payable, current 684us-gaap_NotesPayableCurrent    
Total current liabilities 11,621us-gaap_LiabilitiesCurrent 2,915us-gaap_LiabilitiesCurrent 2,930us-gaap_LiabilitiesCurrent
Notes payable, net of discount, long-term 6,819us-gaap_LongTermNotesPayable    
Total liabilities 18,440us-gaap_Liabilities 2,915us-gaap_Liabilities 2,930us-gaap_Liabilities
Commitments and contingencies         
Redeemable convertible preferred stock (Series A, B, C, D and E),   103,797us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital 62,785us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
Stockholders' equity (deficit):      
Preferred stock        
Common stock 23us-gaap_CommonStockValue 1us-gaap_CommonStockValue 1us-gaap_CommonStockValue
Additional paid-in capital 205,627us-gaap_AdditionalPaidInCapitalCommonStock 332us-gaap_AdditionalPaidInCapitalCommonStock 150us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (94,454)us-gaap_RetainedEarningsAccumulatedDeficit (68,907)us-gaap_RetainedEarningsAccumulatedDeficit (54,880)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' deficit 111,196us-gaap_StockholdersEquity (68,574)us-gaap_StockholdersEquity (54,729)us-gaap_StockholdersEquity
Total liabilities, redeemable convertible preferred stock and stockholders' deficit $ 129,636us-gaap_LiabilitiesAndStockholdersEquity $ 38,138us-gaap_LiabilitiesAndStockholdersEquity $ 10,986us-gaap_LiabilitiesAndStockholdersEquity