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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating activities      
Net income (loss) $ 5,459,477us-gaap_NetIncomeLoss $ (18,032,438)us-gaap_NetIncomeLoss $ (17,291,758)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash used in operating activities:      
Depreciation 857,055us-gaap_Depreciation 674,725us-gaap_Depreciation 358,367us-gaap_Depreciation
Stock-based compensation 8,025,261us-gaap_ShareBasedCompensation 6,059,005us-gaap_ShareBasedCompensation 3,022,693us-gaap_ShareBasedCompensation
Loss on disposal of property and equipment 6,100us-gaap_GainLossOnSaleOfPropertyPlantEquipment 1,778us-gaap_GainLossOnSaleOfPropertyPlantEquipment 6,354us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Loss on extinguishment of debt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 992,281us-gaap_GainsLossesOnExtinguishmentOfDebt
Accretion of bond premium 1,615,063us-gaap_AccretionExpense 1,246,143us-gaap_AccretionExpense 961,271us-gaap_AccretionExpense
Non cash interest expense 0us-gaap_PaidInKindInterest 0us-gaap_PaidInKindInterest 73,914us-gaap_PaidInKindInterest
Change in operating assets and liabilities:      
Receivables 5,490,605us-gaap_IncreaseDecreaseInAccountsReceivable (2,508,687)us-gaap_IncreaseDecreaseInAccountsReceivable (1,409,738)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and other assets 2,711,331us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 2,016,928us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,287,834)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (3,700,175)us-gaap_IncreaseDecreaseInAccountsPayable (386,241)us-gaap_IncreaseDecreaseInAccountsPayable 524,936us-gaap_IncreaseDecreaseInAccountsPayable
Accrued interest, wages, benefits and other liabilities (2,923,537)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 1,337,021us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 3,483,896us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Deferred revenue (59,746,948)us-gaap_IncreaseDecreaseInDeferredRevenue (41,488,719)us-gaap_IncreaseDecreaseInDeferredRevenue 99,757,129us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by (used in) operating activities (42,205,768)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (51,080,485)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 89,191,511us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities      
Purchases of property and equipment (1,501,744)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (827,839)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,862,872)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from disposal of property and equipment 10,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Purchases of investments (149,370,678)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (125,026,602)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (265,203,590)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from sales and maturities of investments 82,302,191us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 195,146,871us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 163,671,395us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Net cash provided by (used in) investing activities (68,560,231)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 69,292,430us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (103,395,067)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities      
Stock repurchase (3,814)us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock
Principal payments on borrowings 0us-gaap_RepaymentsOfLongTermDebt 0us-gaap_RepaymentsOfLongTermDebt (13,544,175)us-gaap_RepaymentsOfLongTermDebt
Proceeds from third public offering, net of issuance costs 101,904,977ecyt_ProceedsFromThirdPublicOfferingNetOfIssuanceCosts 0ecyt_ProceedsFromThirdPublicOfferingNetOfIssuanceCosts 0ecyt_ProceedsFromThirdPublicOfferingNetOfIssuanceCosts
Proceeds from the exercise of stock options 1,290,886us-gaap_ProceedsFromStockOptionsExercised 644,934us-gaap_ProceedsFromStockOptionsExercised 391,407us-gaap_ProceedsFromStockOptionsExercised
Proceeds from stock purchase under employee stock purchase plan 299,229ecyt_ProceedsFromEmployeeStockPurchasePlan 0ecyt_ProceedsFromEmployeeStockPurchasePlan 0ecyt_ProceedsFromEmployeeStockPurchasePlan
Net cash provided by (used in) financing activities 103,491,278us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 644,934us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (13,152,768)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate (38,776)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (6,805)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 707us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents (7,313,497)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 18,850,074us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (27,355,617)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 52,846,940us-gaap_CashAndCashEquivalentsAtCarryingValue 33,996,866us-gaap_CashAndCashEquivalentsAtCarryingValue 61,352,483us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 45,533,443us-gaap_CashAndCashEquivalentsAtCarryingValue $ 52,846,940us-gaap_CashAndCashEquivalentsAtCarryingValue $ 33,996,866us-gaap_CashAndCashEquivalentsAtCarryingValue