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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating activities    
Net loss $ (9,460)us-gaap_NetIncomeLoss $ (225)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 443us-gaap_DepreciationDepletionAndAmortization 325us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation 1,474us-gaap_ShareBasedCompensation 946us-gaap_ShareBasedCompensation
Changes in revaluation of warrant liability (6,296)us-gaap_FairValueAdjustmentOfWarrants (9,034)us-gaap_FairValueAdjustmentOfWarrants
Non-cash interest expense 64us-gaap_OtherNoncashIncomeExpense 0us-gaap_OtherNoncashIncomeExpense
Deferred income taxes 1us-gaap_DeferredIncomeTaxExpenseBenefit 6us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:    
Accounts receivable 340us-gaap_IncreaseDecreaseInAccountsReceivable 1,182us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (1,220)us-gaap_IncreaseDecreaseInInventories 1,117us-gaap_IncreaseDecreaseInInventories
Other assets (116)us-gaap_IncreaseDecreaseInOtherOperatingAssets (764)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable 484us-gaap_IncreaseDecreaseInAccountsPayable (2,181)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities (1,488)us-gaap_IncreaseDecreaseInAccruedLiabilities (1,295)us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenue 23us-gaap_IncreaseDecreaseInDeferredRevenue 98us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash used in operating activities (15,751)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (9,825)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities    
Capital expenditures (59)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (839)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of investments (69,982)us-gaap_PaymentsToAcquireInvestments (460)us-gaap_PaymentsToAcquireInvestments
Proceeds from maturities of investments 4,400us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 4,300us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Restricted cash 47us-gaap_IncreaseDecreaseInRestrictedCash 0us-gaap_IncreaseDecreaseInRestrictedCash
Net cash provided by (used in) investing activities (65,594)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 3,001us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities    
Net proceeds from equity incentive plans 999us-gaap_ProceedsFromIssuanceOrSaleOfEquity 1,425us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Net proceeds from public offering 75,527us-gaap_ProceedsFromIssuanceOfCommonStock 31us-gaap_ProceedsFromIssuanceOfCommonStock
Repayment of debt (28)us-gaap_RepaymentsOfLongTermDebt (125)us-gaap_RepaymentsOfLongTermDebt
Net cash provided by financing activities 76,498us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 1,331us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents (4,847)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (5,493)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 22,781us-gaap_CashAndCashEquivalentsAtCarryingValue [1] 29,485us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 17,934us-gaap_CashAndCashEquivalentsAtCarryingValue $ 23,992us-gaap_CashAndCashEquivalentsAtCarryingValue
[1] The financial information in this column was derived from audited financial statements included in the Company's 2014 Annual Report on Form 10-K.