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Commitments and Contingencies - Additional Information (Detail)
 12 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
Deutsche Bank Securities
EUR (€)
Dec. 31, 2013
Deutsche Bank Securities
EUR (€)
Dec. 31, 2014
Berkeley, California (the "Berkeley Lease")
USD ($)
Dec. 31, 2013
Berkeley, California (the "Berkeley Lease")
USD ($)
Dec. 31, 2014
Dusseldorf, Germany (the "Dusseldorf Lease")
Dec. 31, 2014
Berkeley, California (the "Berkeley Lease")
USD ($)
Dec. 31, 2013
Berkeley, California (the "Berkeley Lease")
USD ($)
Dec. 31, 2004
Berkeley, California (the "Berkeley Lease")
USD ($)
Dec. 31, 2004
Berkeley, California (the "Berkeley Lease")
Contingency, B
Dec. 31, 2004
Berkeley, California (the "Berkeley Lease")
Contingency, B
Minimum
USD ($)
Dec. 31, 2004
Berkeley, California (the "Berkeley Lease")
Contingency, A
USD ($)
Dec. 31, 2004
Berkeley, California (the "Berkeley Lease")
Contingency, A
Minimum
Dec. 31, 2004
Berkeley, California (the "Berkeley Lease")
Contingency, A
Maximum
USD ($)
Loss Contingencies [Line Items]                                
Operating leases expiration date           2018-06   2023-03 2018-06              
Unoccupied facility expense $ 386,000us-gaap_BusinessExitCosts1 $ 926,000us-gaap_BusinessExitCosts1       $ 400,000us-gaap_BusinessExitCosts1
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 $ 900,000us-gaap_BusinessExitCosts1
/ us-gaap_StatementGeographicalAxis
= stpr_CA		                  
Rent expense, net 1,700,000us-gaap_OperatingLeasesRentExpenseNet 1,900,000us-gaap_OperatingLeasesRentExpenseNet 1,700,000us-gaap_OperatingLeasesRentExpenseNet                          
Deferred rent 600,000us-gaap_DeferredRentCredit 600,000us-gaap_DeferredRentCredit                            
Deferred gain (loss) on lease (700,000)us-gaap_GainLossOnSaleOfLeasedAssetsNetOperatingLeases (700,000)us-gaap_GainLossOnSaleOfLeasedAssetsNetOperatingLeases                            
Letter of credit pledged as security       200,000us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedUnderLetterOfCreditFacilitiesAtFairValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dvax_DeutscheBankSecuritiesMember		             400,000us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedUnderLetterOfCreditFacilitiesAtFairValue
/ us-gaap_StatementGeographicalAxis
= dvax_CaliforniaMember		          
Collateralized certificate of deposit       200,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dvax_DeutscheBankSecuritiesMember		 200,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dvax_DeutscheBankSecuritiesMember		       400,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_StatementGeographicalAxis
= dvax_CaliforniaMember		 400,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_StatementGeographicalAxis
= dvax_CaliforniaMember		            
Terms of the lease           If the total amount of our cash, cash equivalents and marketable securities falls below $20 million for a period of more than 30 consecutive days during the lease term, the amount of the required security deposit will increase to $1.1 million, until such time as our projected cash and cash equivalents will exceed $20 million for the remainder of the lease term, or until our actual cash and cash equivalents remains above $20 million for a period of 12 consecutive months.     If the total amount of our cash, cash equivalents and marketable securities falls below $20 million for a period of more than 30 consecutive days during the lease term, the amount of the required security deposit will increase to $1.1 million, until such time as our projected cash and cash equivalents will exceed $20 million for the remainder of the lease term, or until our actual cash and cash equivalents remains above $20 million for a period of 12 consecutive months.              
Cash, cash equivalents and marketable securities 122,700,000us-gaap_CashCashEquivalentsAndShortTermInvestments                       20,000,000us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dvax_ContingencyBMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= dvax_CaliforniaMember		     20,000,000us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dvax_ContingencyAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= dvax_CaliforniaMember
Contingency period for cash, cash equivalents and marketable securities                       12 months     30 days  
Increase in amount of the security deposit                           1,100,000us-gaap_IncreaseDecreaseInSecurityDeposits
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dvax_ContingencyAMember
/ us-gaap_StatementGeographicalAxis
= dvax_CaliforniaMember		    
Future payments obligation $ 25,500,000us-gaap_LongTermPurchaseCommitmentAmount