Convertible Debentures (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Feb. 28, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Convertible Debentures Disclosure [Abstract]
Shares issued for exercise of warrants			$ 0	$ 8,555
Shares issued for exercise of warrants, shares			0	462,000
Proceeds from exercise of stock warrants		0	0	7,500
Conversion of principal into shares of common stock	8,300		8,333	0
Conversion of principal into shares of common stock, shares	514,086		514,000	0
Interest paid with cash			17	115
Total debenture payments			$ 8,350	$ 115