Restricted Stock Units (RSUs) Activity (Detail) (Restricted Stock Units, USD $)	6 Months Ended
Jun. 30, 2011 Year
Restricted Stock Units
Number of Units
Outstanding at beginning of period	20,000
Granted	18,488
Forfeited	(3,250)
Outstanding at end of period	35,238
Exercisable at end of period	0
Vested and expected to vest in the future at end of period	27,216
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	2.14
Exercisable at end of period	0.00
Vested and expected to vest in the future at end of period	2.11
Aggregate Intrinsic Value
Outstanding at end of period	$ 3,140,411
Exercisable at end of period	0.00
Vested and expected to vest in the future at end of period	$ 2,425,509

Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]

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Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Exercisable, Intrinsic Value

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Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Exercisable, Number

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Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Exercisable Weighted Average Remaining Contractual Term

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Outstanding, Intrinsic Value

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Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other Than Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number

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Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Vested and Expected to Vest Outstanding Weighted Average Remaining Contractual Term

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Remaining Contractual Term [Abstract]

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(a)
-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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(b)
-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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average period between the balance sheet date and expiration for equity-based awards other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan), which may be expressed in a decimal value for number of years.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (e)(1)
-SubTopic 10
-Topic 718
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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