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Stockholders' Equity (Details 4) (USD $)	3 Months Ended
Stockholders' Equity (Details 4) (USD $)	Mar. 31, 2013
Summary of non-vested stock options
Nonvested at January 1, 2013	854,640
Granted	116,242
Vested	(211,087)
Forfeited	(154,281)
Nonvested at March 31, 2013	605,514
Weighted Average Grant Date Fair Value, Nonvested at March 31, 2013	$ 2.21
Nonvested at March 31, 2013, Aggregate Intrinsic Value	$ 644,522

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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