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Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail)	9 Months Ended
	Sep. 30, 2015
Computer and Network Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of property and equipment	5 years
Computer and Network Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of property and equipment	7 years
Furniture, Fixtures and Office Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of property and equipment	3 years
Furniture, Fixtures and Office Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of property and equipment	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated life of property and equipment	7 years

X

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix:
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X

- Details

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