v2.4.0.6

Share-Based Awards- Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average estimated fair values of Employee stock options granted	$ 3.95
Unrecognized estimated compensation cost related to stock options	$ 874,000
Weighted average period for unrecognized estimated compensation cost related to stock options	1 year 3 months 18 days
Issuance of unvested shares of common stock, duration	4 years
Issuance of unvested shares of common stock, percentage	25.00%
Unrecognized estimated compensation cost related to non-vested common shares	$ 6,253,000
Weighted average period for unrecognized estimated compensation cost related to stock options	2 years 9 months 18 days
Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issue common stock for the members of the Board of Directors later	25.00%
Immediately Issue Common Stock For The Members Of The Board Of Directors	25.00%

Employee stock options granted weighted average estimated fair value.

+ References

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- Definition

Immediately issue common stock for members of board of directors.

+ References

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- Definition

Issuance of unvested shares of common stock duration.

+ References

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- Definition

Issuance of unvested shares of common stock percentage.

+ References

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- Definition

Unvested shares vesting percentage thereafter.

+ References

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- Definition

Weighted average period for unrecognized estimated compensation.

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- Definition

Weighted average period for unrecognized estimated compensation cost related to stock options.

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No definition available.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

+ References

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