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Stockholders' Equity (Details 4) (USD $)	9 Months Ended
Stockholders' Equity (Details 4) (USD $)	Sep. 30, 2012
Summary of non-vested stock options
Nonvested at January 1, 2012	786,188
Granted	415,206
Vested	(377,170)
Forfeited	(69,584)
Nonvested at September 30, 2012	754,640
Weighted Average Grant Date Fair Value, Nonvested at September 30, 2012	$ 2.67
Nonvested at September 30, 2012, Aggregate Intrinsic Value	$ 2,754,880

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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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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