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Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Statement [Abstract]        
Product sales $ 86,633 $ 101,902 $ 177,969 $ 199,510
Marketing service fees 11,647 11,521 23,684 22,849
Net sales 98,280 113,423 201,653 222,359
Cost of sales 20,246 27,547 45,863 48,925
Gross profit 78,034 85,876 155,790 173,434
Operating expenses        
Sales and marketing 44,910 47,075 89,964 94,203
General and administrative 15,204 14,295 33,534 28,865
Research and development 8,551 9,252 14,292 16,302
Amortization of intangible assets 565 580 1,109 1,160
Charges related to U.S. Government resolutions   376   686
Total operating expenses 69,230 71,578 138,899 141,216
Operating income 8,804 14,298 16,891 32,218
Other income and expense        
Interest expense, net (470) (1,265) (1,030) (3,486)
Other income (expense), net (1,207) 660 3,557 29
Total other income (expense) (1,677) (605) 2,527 (3,457)
Income before income taxes 7,127 13,693 19,418 28,761
Income tax expense (2,997) (3,823) (7,678) (10,294)
Net income from continuing operations, net of tax 4,130 9,870 11,740 18,467
Discontinued operations (Note 15)        
Gain on sale of Breg, Inc., net of tax   1,040   1,040
Loss from discontinued operations (9,154) (5,853) (13,588) (5,326)
Income tax benefit 2,707 2,197 4,031 2,480
Net loss from discontinued operations, net of tax (6,447) (2,616) (9,557) (1,806)
Net Income (loss) (2,317) 7,254 2,183 16,661
Net income (loss) per common share- basic:        
Net income from continuing operations, net of tax $ 0.22 $ 0.52 $ 0.61 $ 0.98
Net income (loss) from discontinued operations, net of tax $ (0.34) $ (0.14) $ (0.50) $ (0.10)
Net income (loss) per common share- basic $ (0.12) $ 0.38 $ 0.11 $ 0.88
Net income (loss) per common share- diluted:        
Net income from continuing operations, net of tax $ 0.21 $ 0.51 $ 0.60 $ 0.96
Net income (loss) from discontinued operations, net of tax $ (0.33) $ (0.14) $ (0.49) $ (0.09)
Net income (loss) per common share- diluted: $ (0.12) $ 0.37 $ 0.11 $ 0.87
Weighted average number of common shares:        
Basic 19,140,520 18,827,452 19,285,004 18,751,573
Diluted 19,270,044 19,215,984 19,483,715 19,168,940
Comprehensive income (loss) $ (2,836) $ 3,842 $ (1,362) $ 15,629