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Property and Equipment, Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2017
Office Equipment
Finite-Lived Intangible Assets [Line Items]
Property and equipment useful life	5 years
Automobiles
Finite-Lived Intangible Assets [Line Items]
Property and equipment useful life	5 years
Furniture and Fixtures | Minimum
Finite-Lived Intangible Assets [Line Items]
Property and equipment useful life	5 years
Furniture and Fixtures | Maximum
Finite-Lived Intangible Assets [Line Items]
Property and equipment useful life	7 years
Leasehold Improvements
Finite-Lived Intangible Assets [Line Items]
Property and equipment useful life	Shorter of length of lease or 10 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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- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223

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- 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.

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