Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Series B Convertible Preferred Stock [Member]	Dec. 31, 2012 Series B Convertible Preferred Stock [Member]	Jun. 30, 2013 Stock Options [Member]	Jun. 30, 2012 Stock Options [Member]	Jun. 30, 2013 Stock Options [Member]	Jun. 30, 2012 Stock Options [Member]
Shareholders' Equity [Line Items]
Preferred stock, shares issued					5,659	5,659
Preferred stock, shares outstanding					5,659	5,659
Proceeds from stock options exercised	$ 233	$ 13	$ 257	$ 42
Exercise of common stock options, shares			163,615				150,960	4,875	163,615	28,875