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Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic and diluted net loss per share (in thousands, except per share amounts): |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (22,286)us-gaap_NetIncomeLoss | $ (29,819)us-gaap_NetIncomeLoss | $ (24,777)us-gaap_NetIncomeLoss | $ (13,840)us-gaap_NetIncomeLoss | $ (13,056)us-gaap_NetIncomeLoss | $ (15,675)us-gaap_NetIncomeLoss | $ (17,164)us-gaap_NetIncomeLoss | $ (20,825)us-gaap_NetIncomeLoss | $ (90,722)us-gaap_NetIncomeLoss | $ (66,720)us-gaap_NetIncomeLoss | $ (69,949)us-gaap_NetIncomeLoss
Preferred stock deemed dividend |  |  |  |  |  |  |  |  |  | (8,469)us-gaap_PreferredStockDividendsIncomeStatementImpact |
Net loss allocable to common stockholders | $ (22,286)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (29,819)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (24,777)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (13,840)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (21,525)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (15,675)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (17,164)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (20,825)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (90,722)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (75,189)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (69,949)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator for basic and diluted net loss per share allocable to common stockholders: |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding | 26,298 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 26,291 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 26,286 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 26,283 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 23,588 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 18,302 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 18,291 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 18,285 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 26,289 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 19,628 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 17,047 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share allocable to common stockholders - basic and diluted | $ (0.85)us-gaap_EarningsPerShareBasicAndDiluted | $ (1.13)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.94)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.53)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.91)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.86)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.94)us-gaap_EarningsPerShareBasicAndDiluted | $ (1.14)us-gaap_EarningsPerShareBasicAndDiluted | $ (3.45)us-gaap_EarningsPerShareBasicAndDiluted | $ (3.83)us-gaap_EarningsPerShareBasicAndDiluted | $ (4.10)us-gaap_EarningsPerShareBasicAndDiluted
Outstanding securities not included in diluted net loss per share calculation (in thousands): |  |  |  |  |  |  |  |  |  |  |
Outstanding securities not included in diluted net loss per share calculation |  |  |  |  |  |  |  |  | 7,422 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 7,293 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 2,827 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Outstanding securities not included in diluted net loss per share calculation (in thousands): |  |  |  |  |  |  |  |  |  |  |
Outstanding securities not included in diluted net loss per share calculation |  |  |  |  |  |  |  |  | 4,343 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember | 4,343 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |
Stock Options and Stock Awards |  |  |  |  |  |  |  |  |  |  |
Outstanding securities not included in diluted net loss per share calculation (in thousands): |  |  |  |  |  |  |  |  |  |  |
Outstanding securities not included in diluted net loss per share calculation |  |  |  |  |  |  |  |  | 1,998 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = dvax_StockOptionsAndShareAwardsMember | 1,704 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = dvax_StockOptionsAndShareAwardsMember | 1,556 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = dvax_StockOptionsAndShareAwardsMember
Warrant |  |  |  |  |  |  |  |  |  |  |
Outstanding securities not included in diluted net loss per share calculation (in thousands): |  |  |  |  |  |  |  |  |  |  |
Outstanding securities not included in diluted net loss per share calculation |  |  |  |  |  |  |  |  | 1,081 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember | 1,246 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember | 1,271 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember

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