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

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