Quarterly Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Third quarter revenue from continuing operations as percentage of total annual revenue									28.00%	25.00%	29.00%
Net revenue	$ 63,037	$ 67,211	$ 54,246	$ 51,646	$ 52,031	$ 51,582	$ 52,685	$ 52,591	$ 236,140	$ 208,889	$ 202,681
Gross profit	24,262	23,449	22,081	20,378	20,828	19,932	20,988	18,088	90,170	79,836	75,639
Asset impairments and related charges	(88)	0	0	208	9,681	0	0	0	120	9,681	959
Legal settlements	1,664	0	0	0					1,664	0	0
Restructuring, severance and other charges	(28)	(31)	430	1,125	5,261	4,558	3,688	2,346	1,496	15,853	405
Loss from continuing operations					(18,032)	(5,774)	(3,554)	(6,879)	(1,298)	(34,239)	(22,975)
Income (loss) from discontinued operations, net of taxes					1,053	(735)	10,487	651	0	11,456	(32,500)
Net loss	$ 330	$ 516	$ (351)	$ (1,793)	$ (16,979)	$ (6,509)	$ 6,933	$ (6,228)	$ (1,298)	$ (22,783)	$ (55,475)
Net (loss) income per share - basic (in dollars per share)	$ 0.02	$ 0.02	$ (0.02)	$ (0.08)					$ (0.06)
Net (loss) income per share - diluted (in dollars per share)	$ 0.01	$ 0.02	$ (0.02)	$ (0.08)					$ (0.06)
Loss from continuing operations (in dollars per share)					$ (0.83)	$ (0.26)	$ (0.16)	$ (0.30)	$ (0.06)	$ (1.53)	$ (1.01)
Income (loss) from discontinued operations (in dollars per share)					$ 0.05	$ (0.03)	$ 0.46	$ 0.03	$ 0.00	$ 0.51	$ (1.43)