Stock-Based Compensation (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of stock option plans
Number of Shares Outstanding, Beginning	2,057,104	2,132,879	2,031,023
Number of Shares Granted	863,202	554,850	250,300
Number of Shares Exercised	(61,796)	(5,000)	(29,206)
Number of shares Forfeited or expired	(431,977)	(625,625)	(119,238)
Number of Shares Outstanding, Ending	2,426,533	2,057,104	2,132,879	2,031,023
Number of Shares Vested and exercisable	1,620,320
Weighted Average Exercise Price per Share Outstanding, Beginning	$ 4.35	$ 5.19	$ 5.09
Weighted Average Exercise Price per Share Granted	$ 3.35	$ 3.39	$ 6.12
Weighted average exercise price per share of options exercised	$ 2.91	$ 2.67	$ 3.92
Weighted Average Exercise Price per Share Forfeited or expired	$ 4.44	$ 6.38	$ 5.72
Weighted Average Exercise Price per Share Outstanding, Ending	$ 4.01	$ 4.35	$ 5.19	$ 5.09
Weighted Average Exercise Price per Share Vested and exercisable	$ 3.99	$ 4.08	$ 5.42
Weighted Average Remaining Contractual Term in Years Outstanding	7 years	6 years 7 months 6 days	5 years 4 months 24 days	5 years 2 months 12 days
Weighted Average Remaining Contractual Term In Years Granted	9 years 6 months	9 years 6 months	8 years 7 months 6 days
Weighted Average Remaining Contractual Term in Years Vested and exercisable	6 years 2 months 12 days
Aggregate Intrinsic Value Outstanding	$ 29
Aggregate Intrinsic Value Outstanding Vested and exercisable	$ 29