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Stock-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Stock-based compensation expense | $ 6,089 us-gaap_ShareBasedCompensation | $ 12,340 us-gaap_ShareBasedCompensation | $ 10,439 us-gaap_ShareBasedCompensation
Employees And Directors |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Stock-based compensation expense | 6,062 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = dvax_EmployeesAndDirectorsMember | 11,828 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = dvax_EmployeesAndDirectorsMember | 10,439 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = dvax_EmployeesAndDirectorsMember
Non Employee |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Stock-based compensation expense | 27 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = dvax_NonEmployeeMember | 512 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = dvax_NonEmployeeMember |
Research and Development Expense |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Stock-based compensation expense | 2,868 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 4,228 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 3,514 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
General and Administrative Expense |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Stock-based compensation expense | $ 3,221 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 8,112 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 6,925 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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