Stock Based Compensation (Details 1) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Schedule of stock option plans
Number of Shares Outstanding at December 31, 2011	2,057,104
Number of Shares Granted	350,563
Number of Shares Exercised	(53,123)
Number of shares Forfeited or expired	(159,238)
Number of Shares Outstanding at June 30, 2012	2,195,306	2,057,104
Number of Shares Vested and exercisable at June 30, 2012	1,562,681
Weighted Average Exercise Price per Share Outstanding at December 31, 2011	$ 4.35
Weighted Average Exercise Price per Share Granted	$ 3.93
Weighted Average Exercise Price per Share Forfeited or expired	$ 6.12
Weighted Average Exercise Price per Share Outstanding at June 30, 2012	$ 4.18	$ 4.35
Weighted Average Exercise Price per Share Vested and exercisable at June 30, 2012	$ 4.01
Weighted Average Remaining Contractual Term in Years Outstanding	7 years	6 years 7 months 6 days
Weighted Average Remaining Contractual Term in Years Vested and exercisable at June 30, 2012	6 years 4 months 24 days
Aggregate Intrinsic Value Outstanding	$ 211
Aggregate Intrinsic Value Outstanding Vested and exercisable at June 30, 2012	$ 149