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Stock-Based Awards - Summary of Options and Restricted Stock Activity (Detail) - 6 months ended Jun. 30, 2015 - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, beginning balance	5,330,070
Options, Granted	0
Options, Exercised/vested	(3,052,358)
Options, Forfeitures	0
Options, ending balance	2,277,712
Weighted Average Exercise Price of Options, beginning balance	$ 1.61
Weighted Average Exercise Price of Options, Granted	0
Weighted Average Exercise Price of Options, Exercised/vested	1.08
Weighted Average Exercise Price of Options, Forfeitures	0
Weighted Average Exercise Price of Options, ending balance	$ 2.32
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards, beginning balance	1,513,939
Restricted Stock Awards, Granted	598,244
Restricted Stock Awards, Exercised/vested	(650,331)
Restricted Stock Awards, Forfeitures	(4,523)
Restricted Stock Awards, ending balance	1,457,329

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



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



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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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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.

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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 option holders acquired shares when converting their stock options into shares.

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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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Number of share options (or share units) exercised during the current period.

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