Stock-Based Compensation - Schedule of Employee Stock Purchase Plan (Detail) (USD $)	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares purchased under ESPP	16,003	10,656
Average price of shares purchased under ESPP	$ 4.51
Intrinsic value of shares purchased under ESPP	$ 36,727

Share based compensation arrangement by share based payment award intrinsic value of shares purchased for award.

No definition available.

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- Details

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- Definition

The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

+ References

+ Details

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