Research collaboration and license agreement period.

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- Definition

Revenue recognition period.

+ References

No definition available.

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

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-Section S99

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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-Section A

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

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- Definition

Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Cash received from collaborators during the current period.

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-Topic 230

-SubTopic 10

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- Definition

The amount of consideration recognized during the period for the milestone or milestones.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 28

-Section 50

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Collaborative Research and Development Agreements - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended			6 Months Ended	12 Months Ended
	Oct. 31, 2011	Sep. 30, 2008	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2012	Jun. 30, 2015	Dec. 31, 2011	Aug. 31, 2014	Sep. 30, 2013	Jun. 30, 2012	May. 31, 2012	Aug. 31, 2010
Deferred Revenue Arrangement [Line Items]
Revenue from milestone payment			$ 8,000,000	$ 5,400,000			$ 3,000,000
Astra Zeneca
Deferred Revenue Arrangement [Line Items]
Collaboration Revenue	$ 3,000,000
Deferred revenue recognition period							30 days
Deferred revenue			12,800,000			$ 11,400,000
National Institutes of Health
Deferred Revenue Arrangement [Line Items]
Grants receivable								$ 200,000
National Institutes of Health \| Hepatic Fibrosis and Cirrhosis
Deferred Revenue Arrangement [Line Items]
Grants receivable									$ 200,000
National Institutes of Health \| Autoimmune Disease
Deferred Revenue Arrangement [Line Items]
Grants receivable										$ 600,000
National Institutes of Health \| Rheumatoid Arthritis
Deferred Revenue Arrangement [Line Items]
Grants receivable											$ 400,000
National Institute of Allergy and Infectious Diseases \| Hepatitis B Virus
Deferred Revenue Arrangement [Line Items]
Grants receivable												$ 1,400,000
National Institute of Allergy and Infectious Diseases \| Iss Technology
Deferred Revenue Arrangement [Line Items]
Research collaboration and license agreement period		5 years
Grants receivable		$ 17,000,000
Amendment
Deferred Revenue Arrangement [Line Items]
Collaboration Revenue			$ 8,000,000	$ 5,400,000	$ 6,000,000
Amendment \| Maximum
Deferred Revenue Arrangement [Line Items]
Additional revenue recognized						$ 100,000,000