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Stockholders' Equity - Summary of Stock Option Activity (Detail) - 6 months ended Jun. 30, 2015 - $ / shares	Total
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Beginning Balance, Number of Shares	5,006,532
Granted, Number of Shares	145,625
Canceled/Forfeited, Number of Shares	(111,084)
Outstanding Ending Balance, Number of Shares	5,041,073
Outstanding Beginning Balance, Weighted-Average Exercise Price Per Share	$ 2.66
Granted, Weighted-Average Exercise Price Per Share	1.25
Canceled/Forfeited, Weighted Average Exercise Price Per Share	2.04
Outstanding Ending Balance, Weighted Average Exercise Price Per Share	2.56
Outstanding, 1.45-3.75 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise Price Per Share, Minimum	1.45
Exercise Price Per Share, Maximum	3.75
Granted, 1.11-1.46 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise Price Per Share, Minimum	1.11
Exercise Price Per Share, Maximum	1.46
Canceled/Forfeited, 1.45-2.10 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise Price Per Share, Minimum	1.45
Exercise Price Per Share, Maximum	2.10
Outstanding, 1.11-3.75 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise Price Per Share, Minimum	1.11
Exercise Price Per Share, Maximum	$ 3.75

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For presentations that combine terminations, 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 or that expired.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (c)(1)(iv)(3)-(4)



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

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

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

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

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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.

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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.

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