Stock Warrants (Summary of Activity) (Details) (Stock warrants, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Stock warrants
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares)	44	158
Granted (in shares)	0	0
Cancelled or expired (in shares)	0	(114)
Outstanding, ending balance (in shares)	44	44
Vested, ending balance (in shares)	22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, weighted-average exercise price, beginning balance	$ 1.50	$ 5.25
Granted, weighted-average exercise price	$ 0.00	$ 0.00
Cancelled or expired, weighted-average exercise price	$ 0.00	$ 4.15
Outstanding, weighted-average exercise price, ending balance	$ 1.50	$ 1.50
Vested, weighted-average exercise price	$ 1.50