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Restructuring Charges - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($) Employee
Restructuring Cost and Reserve [Line Items]
Percentage of workforce reduction		26.00%
Number of employees eliminated | Employee		198
Restructuring charges		$ 3.2
Restructuring liability	$ 3.2	$ 3.2
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.0
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.2

X

- Definition

The number of positions eliminated during the period as a result of restructuring activities.

+ References

No definition available.

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- Definition

The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s).

+ References

No definition available.

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



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-Name Staff Accounting Bulletin (SAB)



-Number Topic 5



-Section P



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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.

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- Definition

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 420



-SubTopic 10



-Section 50



-Paragraph 1



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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869



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