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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Statement [Abstract]    
Product sales $ 88,358 $ 104,820
Marketing service fees 11,896 11,222
Net sales 100,254 116,042
Cost of sales 22,699 21,940
Gross profit 77,555 94,102
Operating expenses    
Sales and marketing 48,839 49,521
General and administrative 18,788 14,570
Research and development 5,400 7,050
Amortization of intangible assets 504 530
Total operating expenses 73,531 71,671
Operating income 4,024 22,431
Other income and expense    
Interest expense, net (560) (2,221)
Other income (expense) 4,764 (631)
Total other income (expense) 4,204 (2,852)
Income before income taxes 8,228 19,579
Income tax expense (3,320) (7,363)
Net income from continuing operations, net of tax 4,908 12,216
Discontinued operations (Note 15)    
Loss from discontinued operations (4,432) (506)
Income tax benefit 1,640 306
Net loss from discontinued operations, net of tax (2,792) (200)
Net income 2,116 12,016
Net income (loss) per common share- basic:    
Net income from continuing operations, net of tax $ 0.25 $ 0.65
Net loss from discontinued operations, net of tax $ (0.14) $ (0.01)
Net income per common share- basic $ 0.11 $ 0.64
Net income per common share- diluted:    
Net income from continuing operations, net of tax $ 0.25 $ 0.64
Net loss from discontinued operations, net of tax $ (0.14) $ (0.01)
Net income per common share- diluted $ 0.11 $ 0.63
Weighted average number of common shares:    
Basic 19,431,093 18,675,694
Diluted 19,691,141 19,116,195
Comprehensive (loss) income $ (1,016) $ 14,726