Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net loss	$ (26,217)us-gaap_NetIncomeLoss	$ (13,840)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	335us-gaap_DepreciationAndAmortization	339us-gaap_DepreciationAndAmortization
Gain on disposal of property and equipment		(20)
Accretion of discounts and amortization of premiums of marketable securities	171	264
Loss on lease		77us-gaap_ProvisionForLeaseLosses
Accretion of debt discount related to debt financing	(51)
Accretion of end of term payment related to debt financing	57
Stock compensation expense	1,954us-gaap_ShareBasedCompensation	1,270us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:
Accounts receivable	(182)	(103)
Prepaid expenses and other current assets	580	(948)
Restricted cash and other assets		266
Accounts payable	2,043	154
Accrued liabilities and other long term liabilities	(2,357)	(1,671)
Deferred revenues	(472)	3,036
Net cash used in operating activities	(24,139)	(11,176)
Investing activities
Purchases of marketable securities	(18,654)	(13,819)
Proceeds from maturities of marketable securities	8,750	28,949
Purchases of property and equipment, net	(618)	(398)
Net cash (used in) provided by investing activities	(10,522)	14,732
Financing activities
Proceeds from exercise of stock options and restricted stock awards	10
Proceeds from exercise of warrants	26us-gaap_ProceedsFromIssuanceOfWarrants
Proceeds from Employee Stock Purchase Plan	103us-gaap_ProceedsFromStockPlans	69us-gaap_ProceedsFromStockPlans
Net cash provided by financing activities	139	69
Effect of exchange rate changes on cash and cash equivalents	(276)	3
Net (decrease) increase in cash and cash equivalents	(34,798)	3,628
Cash and cash equivalents at beginning of period	49,511	23,122
Cash and cash equivalents at end of period	14,713	26,750
Non-cash investing and financing activities:
Cash paid during the year for interest	184us-gaap_InterestPaid
Disposal of fully depreciated property and equipment	4dvax_SupplementalDisposalOfAssets	274dvax_SupplementalDisposalOfAssets
Net change in unrealized gain on marketable securities	$ 8	$ 69

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Name:	us-gaap_ProceedsFromStockPlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense related to estimated loss to be realized from lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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Name:	us-gaap_ProvisionForLeaseLosses
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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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Balance Type:	debit
Period Type:	duration