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Stockholders' Equity - Summary of Stock Option Outstanding (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Equity [Abstract]
Option Outstanding - Range of Exercise Prices, Lower Limit	$ 2
Option Outstanding - Range of Exercise Prices, Upper Limit	$ 3.75
Option Outstanding - Number of Shares	4,863,615	4,141,948
Option Outstanding - Weighted-Average Remaining Contractual Life	7 years 3 months 18 days
Option Outstanding - Weighted Average Exercise Price	$ 2.70	$ 2.48
Option Exercisable	3,266,115
Option Exercisable - Weighted Average Exercise Price	$ 2.63

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

+ References

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

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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