Stockholders' Equity (Details 1) (USD $)	9 Months Ended
	Sep. 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	(728,872)
Number of Shares, Forfeitures	(250,741)
Number of Shares, outstanding at September 30, 2012	4,240,352
Weighted Average Exercise Price Per Share, outstanding at January 1, 2012	$ 3.66
Weighted average exercise price per share exercised	$ 2.57
Weighted Average Exercise Price Per Share, Forfeitures	$ 3.26
Weighted Average Exercise Price Per Share, outstanding at September 30, 2012	$ 3.67
Aggregate Intrinsic Value, outstanding at September 30, 2012	$ 11,443,601
Officers and Directors [Member]
Summary of stock option activity
Number of Shares, granted	281,174
Weighted Average Exercise Price Per Share, Granted	$ 2.36
Others [Member]
Summary of stock option activity
Number of Shares, granted	385,540
Weighted Average Exercise Price Per Share, Granted	$ 2.30