Quarterly Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 44,019	$ 48,223	$ 47,708	$ 54,598	$ 47,021	$ 47,805	$ 52,458	$ 48,543	$ 194,548	$ 195,827	$ 251,838
Gross profit	7,877	12,268	12,661	15,565	8,799	11,441	13,113	11,930	48,371	45,283	44,185
Total income (loss) from continuing operations before taxes	(4,596)	(2,581)	(2,545)	69	(4,859)	(3,162)	(302)	(12)	(9,653)	(8,335)	(7,019)
Net income (loss)	(4,883)	(2,734)	(2,945)	160	(4,798)	(3,237)	(367)	(62)	(14,950)	(22,024)	(13,251)
Basic and diluted net income (loss) per share	$ (0.08)	$ (0.05)	$ (0.05)	$ 0.00	$ (0.08)	$ (0.06)	$ (0.01)	$ 0.00	$ (0.26)	$ (0.40)	$ (0.25)
Restructuring charge (recovery)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 700	$ 0	$ 0	$ (205)	$ 668	$ 2,089