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Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance, number of shares	4,141,948
Granted, number of shares	780,000
Canceled/Forfeited, number of shares	(58,333)
Outstanding balance, number of shares	4,863,615
Outstanding balance, weighted average exercise price per share	$ 2.48
Granted, weighted average exercise price per share	$ 3.66
Canceled/Forfeited, weighted average exercise price per share	$ 2.05
Outstanding balance, weighted average exercise price per share	$ 2.70
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance, exercise price per share	$ 2.00
Granted, exercise price per share	$ 2.90
Canceled/Forfeited, exercise price per share	$ 2.05
Outstanding balance, exercise price per share	$ 2.00
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance, exercise price per share	$ 3.25
Granted, exercise price per share	$ 3.75
Canceled/Forfeited, exercise price per share	$ 2.05
Outstanding balance, exercise price per share	$ 3.75

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Exercise Price

+ References

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- Definition

Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Exercise Price

+ References

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- Definition

Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Exercise Price

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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

-Subparagraph (c)(1)(iv)(3)

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

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- Definition

Gross number of share options (or share units) granted during the period.

+ 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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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

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- Definition

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

-Subparagraph (c)(1)(i)

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

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