Stockholder's Equity - Schedule of Share-based Compensation, Activity (Detail) (USD $)			12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quantity	5,564,833	5,016,916	5,564,833
Weighted-average exercise price	$ 4.14	$ 4.54	$ 4.14
Weighted Average Remaining Contractual Term (in Years)			6 years 9 months 0 days
Intrinsic value			$ 11,592
Quantity			4,970,354
Weighted-average exercise price			$ 4.40
Weighted Average Remaining Contractual Term (in Years)			6 years 5 months 19 days
Intrinsic value			$ 11,592

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ 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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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