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Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income. false 4 Net loss 2 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 true true false false -347647000 -347647 false false false 2 true true false false -187652000 -187652 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 false 5 Adjustments to reconcile net loss to net cash used in operating activities: 2 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 6 Depreciation and amortization expense 3 us-gaap_DepreciationDepletionAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 8961000 8961 false false false 2 false true false false 3267000 3267 false false false xbrli:monetaryItemType monetary The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. 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No authoritative reference available. false 9 Amortization of securities discount and premium 3 us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 965000 965 false false false 2 false true false false -48000 -48 false false false xbrli:monetaryItemType monetary This item represents the net amount of amortization of purchase discounts and premiums related to investments in debt securities. The purchase discount or premium is amortized to income or expense, respectively, over the life (holding period) of the securities to arrive at an amount of periodic interest income or expense which results in a constant effective yield on the investments. 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No authoritative reference available. false 13 Inventory 4 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -10072000 -10072 false false false 2 false true false false -948000 -948 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 true 18 Net cash used in operating activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -166679000 -166679 false false false 2 false true false false -52802000 -52802 false false false xbrli:monetaryItemType monetary The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 19 Investing Activities: 1 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 20 Maturities and sales of investments 2 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 243903000 243903 false false false 2 false true false false 38972000 38972 false false false xbrli:monetaryItemType monetary The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c true 23 Net cash used in investing activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -143421000 -143421 false false false 2 false true false false -69130000 -69130 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from investing activity. 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No authoritative reference available. false 28 Payments on capital lease obligations 2 dndn_RepaymentsOfCapitalLeaseObligations dndn false credit duration Repayments of Capital Lease Obligations. false false false false false false false false false false true negated false 1 false true false false -1338000 -1338 false false false 2 false true false false -197000 -197 false false false xbrli:monetaryItemType monetary Repayments of Capital Lease Obligations. No authoritative reference available. false 29 Payments on long-term debt 2 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false true false false -2048000 -2048 false false false xbrli:monetaryItemType monetary The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. 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No authoritative reference available. false 31 Net proceeds from exercise of stock options and other 2 dndn_NetProceedsPaymentsFromExerciseOfStockOptionsAndOther dndn false debit duration Net proceeds (payments) from exercise of stock options and other. false false false false false false false false false false false verboselabel false 1 false true false false 7404000 7404 false false false 2 false true false false 14963000 14963 false false false xbrli:monetaryItemType monetary Net proceeds (payments) from exercise of stock options and other. No authoritative reference available. false 32 Issuance of common stock under Employee Stock Purchase Plan 2 dndn_IssuanceOfCommonStockUnderEmployeeStockPurchasePlan dndn false debit duration The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share... false false false false false false false false false false false totallabel false 1 false true false false 1991000 1991 false false false 2 false true false false 672000 672 false false false xbrli:monetaryItemType monetary The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. No authoritative reference available. true 33 Net cash provided by financing activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 79178000 79178 false false false 2 false true false false 234894000 234894 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from financing activity for the period. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 35 Cash and cash equivalents at beginning of year 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 409829000 409829 false false false 2 false true false false 59523000 59523 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 22 -Subparagraph c false 41 Exercise of warrants 2 dndn_ExerciseOfWarrants dndn false na duration Exercise of Warrants. false false false false false false false false false false false verboselabel false 1 true true false false 275520000 275520 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Exercise of Warrants. No authoritative reference available. false 2 39 false Thousands UnKnown UnKnown false true