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Stock-Based Compensation (Details 3) (Restricted stock units [Member], USD $)	3 Months Ended
	Mar. 31, 2013
Restricted stock units [Member]
Summary of restricted stock unit activity
Number of RSUs, Beginning balance	1,534,200
Number of RSUs, Granted	65,200
Number of RSUs, Vested and exercised	(362,418)
Number of RSUs, Cancelled
Number of RSUs, Ending balance	1,236,982
Weighted-average grant date fair value per RSU, Beginning balance	$ 2.10
Weighted-average grant date fair value per RSU, Granted	$ 1.64
Weighted-average grant date fair value per RSU, Vested and exercised	$ 1.06
Weighted-average grant date fair value per RSU, Cancelled
Weighted-average grant date fair value per RSU, Ending balance	$ 2.38

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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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