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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 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]                        
Product sales                   $ 352,796 $ 401,039 $ 405,147
Marketing service fees                   47,738 46,542 36,824
Net sales 106,143 92,738 98,280 103,373 117,365 107,857 113,423 108,936   400,534 447,581 441,971
Cost of sales 32,517 23,920 20,246 25,617 24,944 24,384 27,547 21,378   102,300 98,253 95,527
Gross profit 73,626 68,818 78,034 77,756 92,421 83,473 85,876 87,558   298,234 349,328 346,444
Operating expenses                        
Sales and marketing                   176,581 187,131 193,511
General and administrative                   65,147 53,391 64,481
Research and development                   26,768 28,577 22,861
Amortization of intangible assets                   2,687 2,298 2,550
Costs related to the accounting review and restatement                   12,945    
Impairment of goodwill                 19,193 19,193    
Charges related to U.S. Government resolutions (Note 17)                     1,295 57,141
Total operating expenses 80,004 84,418 69,230 69,669 66,808 64,668 71,578 69,638   303,321 272,692 340,544
Operating (loss) income 6,378 (15,600) 8,804 8,087 25,613 18,805 14,298 17,920   (5,087) 76,636 5,900
Other income and (expense)                        
Interest expense, net                   (1,925) (4,743) (5,541)
Other income (expense)                   2,220 (1,705) (2,412)
Total other income (expense)                   295 (6,448) (7,953)
(Loss) income before income taxes                   (4,792) 70,188 (2,053)
Income tax expense                   (10,116) (25,138) (14,165)
Net (loss) income from continuing operations (8,564) (18,084) 4,130 7,610 16,009 10,574 9,870 8,597   (14,908) 45,050 (16,218)
Discontinued operations (Note 16)                        
Gain on sale of Breg, Inc., net of tax                     1,345  
Loss from discontinued operations                   (15,510) (2,994) (2,705)
Income tax benefit (expense)                   4,903 (563) 813
Net loss from discontinued operations                   (10,607) (2,212) (1,892)
Net (loss) income                   (25,515) 42,838 (18,110)
Net income (loss) per common share-basic:                        
Net (loss) income from continuing operations $ (0.47) $ (1.00) $ 0.22 $ 0.39 $ 0.83 $ 0.55 $ 0.52 $ 0.46   $ (0.80) $ 2.37 $ (0.89)
Net loss from discontinued operations                   $ (0.57) $ (0.12) $ (0.10)
Net (loss) income per common share-basic $ (0.43) $ (1.10) $ (0.12) $ 0.23 $ 1.10 $ 0.26 $ 0.38 $ 0.50   $ (1.37) $ 2.25 $ (0.99)
Net income (loss) per common share-diluted:                        
Net (loss) income from continuing operations $ (0.47) $ (1.00) $ 0.21 $ 0.39 $ 0.81 $ 0.54 $ 0.51 $ 0.45   $ (0.80) $ 2.32 $ (0.89)
Net loss from discontinued operations                   $ (0.57) $ (0.11) $ (0.10)
Net (loss) income per common share-diluted: $ (0.43) $ (1.10) $ (0.12) $ 0.23 $ 1.07 $ 0.25 $ 0.37 $ 0.49   $ (1.37) $ 2.21 $ (0.99)
Weighted average number of common shares:                        
Basic                   18,697,228 18,977,263 18,219,343
Diluted                   18,697,228 19,390,413 18,219,343
Other comprehensive income (loss), before tax:                        
Translation adjustment                   (1,768) 768 (2,279)
Unrealized gain (loss) on derivative instrument                   (442) 416 (693)
Other comprehensive income (loss), before tax                   (2,210) 1,184 (2,972)
Income tax related to components of other comprehensive income 164       (153)       164 164 (153) 256
Other comprehensive income (loss), net of tax                   (2,046) 1,031 (2,716)
Comprehensive (loss) income                   $ (27,561) $ 43,869 $ (20,826)