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Quarterly Results (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Net revenue $ 27,750 $ 24,965 $ 24,846 $ 23,700 $ 22,068 $ 27,042 $ 23,277 $ 21,621 $ 101,261 $ 94,008 $ 82,051
Gross profit 16,660 15,155 16,588 15,637 14,850 14,930 14,273 13,566 64,040 57,619 49,626
Asset impairments and related charges 0 309 18 0 (88) 0 0 208 327 120 9,681
Legal settlements         1,664 0 0 0 0 1,664 0
Restructuring, severance and other charges 569 206 562 55 (29) (31) 430 1,125 1,392 1,495 15,247
Loss from continuing operations (663) (1,711) (1,310) 789 (1,630) (945) (1,189) (2,450) (2,895) (6,214) (37,493)
Income from discontinued operations, net of taxes (1,346) (952) 21,763 527 1,959 1,461 838 658 19,992 4,916 14,710
Net income (loss) $ (2,009) $ (2,663) $ 20,453 $ 1,316 $ 329 $ 516 $ (351) $ (1,792) $ 17,097 $ (1,298) $ (22,783)
Income (Loss) from Continuing Operations, Per Basic Share $ (0.03) $ (0.08) $ (0.06) $ 0.04         $ (0.13)    
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share $ (0.06) $ (0.04) $ 0.98 $ 0.02         $ 0.90    
Net (loss) income per share - basic (in dollars per share) $ (0.09) $ (0.12) $ 0.92 $ 0.06         $ 0.77    
Income (Loss) from Continuing Operations, Per Diluted Share $ (0.03) $ (0.08) $ (0.06) $ 0.04         $ (0.13)    
Income (loss) from discontinued operations $ (0.06) $ (0.04) $ 0.98 $ 0.02         $ 0.90    
Earnings Per Share, Diluted $ (0.09) $ (0.12) $ 0.92 $ 0.06         $ 0.77    
Loss from continuing operations (in dollars per share)         $ (0.07) $ (0.04) $ (0.05) $ (0.11) $ (0.13) $ (0.28) $ (1.67)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share         $ (0.08) $ (0.06) $ (0.03) $ (0.03) $ (0.90) $ (0.22) $ (0.65)
Earnings Per Share, Basic and Diluted         $ 0.01 $ 0.02 $ (0.02) $ (0.08) $ 0.77 $ (0.06) $ (1.02)