Liquidity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Liquidity [Abstract]
Net loss	$ (2,560)	$ (3,138)
Cash and cash equivalents	3,837	13,452	8,319	16,917
Net cash used in operating activities	(3,156)	(2,356)
Capital expenditures	311	986
Revenues	$ 34,785	$ 38,792
Revenue decline compared to prior year period, percentage	(10.30%)
SG&A decrease compared to prior year period, percentage	(15.00%)