Stockholders' Equity (Details 1) (USD $)	6 Months Ended
	Jun. 30, 2012
Summary of stock option activity
Number of Shares, outstanding at January 1, 2012	4,553,251
Number of Shares, granted	0
Number of Shares, Exercised	(179,178)
Number of Shares, Forfeitures	(250,741)
Number of Shares, outstanding at June 30, 2012	4,707,546
Weighted Average Exercise Price Per Share, outstanding at January 1, 2012	$ 3.66
Weighted average exercise price per share exercised	$ 2.29
Weighted Average Exercise Price Per Share, Forfeitures	$ 3.26
Weighted Average Exercise Price Per Share, outstanding at June 30, 2012	$ 3.50
Aggregate Intrinsic Value, outstanding at June 30, 2012	$ 6,171,895
Officers and Directors [Member]
Summary of stock option activity
Number of Shares, granted	223,674
Weighted Average Exercise Price Per Share, Granted	$ 1.85
Others [Member]
Summary of stock option activity
Number of Shares, granted	360,540
Weighted Average Exercise Price Per Share, Granted	$ 2.14