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Restatement of the Condensed Consolidated Financial Statements - Effects of Restatement of Consolidated Statement of Operations and Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Product sales $ 81,061 $ 96,552 $ 259,030 $ 296,062
Marketing service fees 11,677 11,305 35,361 34,154
Net sales 92,738 107,857 294,391 330,216
Cost of sales 23,920 24,384 69,783 73,309
Gross profit 68,818 83,473 224,608 256,907
Operating expenses        
Sales and marketing 42,382 43,022 132,346 137,225
General and administrative 13,202 13,850 46,736 42,715
Research and development 6,361 6,858 20,653 23,160
Amortization of intangible assets 616 565 1,725 1,725
Impairment of goodwill 19,193    19,193  
Charges related to U.S. Government resolutions   373   1,059
Total operating expense 84,418 64,668 223,317 205,884
Operating income (15,600) 18,805 1,291 51,023
Other income and expense        
Interest expense, net (555) (464) (1,585) (3,950)
Other expense (1,481) (1,021) 2,076 (992)
Total other income and expense (2,036) (1,485) 491 (4,942)
Income before income taxes (17,636) 17,320 1,782 46,081
Income tax expense (448) (6,746) (8,126) (17,040)
Net income from continuing operations, net of tax (18,084) 10,574 (6,344) 29,041
Discontinued operations (Note 15)        
Gain on sale of Breg, Inc., net of tax   221   1,261
Loss from discontinued operations (3,041) (9,048) (16,629) (14,374)
Income tax benefit 1,303 3,269 5,334 5,749
Net loss from discontinued operations, net of tax (1,738) (5,558) (11,295) (7,364)
Net income (19,822) 5,016 (17,639) 21,677
Net income (loss) per common share-basic:        
Net income from continuing operations, net of tax $ (1.00) $ 0.55 $ (0.34) $ 1.54
Net loss from discontinued operations, net of tax $ (0.10) $ (0.29) $ (0.60) $ (0.39)
Net income (loss) per common share-basic $ (1.10) $ 0.26 $ (0.94) $ 1.15
Net income (loss) per common share-diluted:        
Net income from continuing operations, net of tax $ (1.00) $ 0.54 $ (0.34) $ 1.51
Net loss from discontinued operations, net of tax $ (0.10) $ (0.29) $ (0.60) $ (0.38)
Net income per common share-diluted $ (1.10) $ 0.25 $ (0.94) $ 1.13
Weighted average number of common shares:        
Basic 18,142,935 19,078,590 18,897,887 18,861,374
Diluted 18,142,935 19,533,021 18,897,887 19,300,263
Comprehensive income (16,064) 6,440 (17,426) 22,069
Previously Reported [Member]
        
Product sales   103,111   315,837
Marketing service fees   11,641   34,449
Net sales   114,752   350,286
Cost of sales   22,373   67,989
Gross profit   92,379   282,297
Operating expenses        
Sales and marketing   49,298   148,629
General and administrative   13,850   42,715
Research and development   6,858   23,160
Amortization of intangible assets   515   1,575
Impairment of goodwill         
Charges related to U.S. Government resolutions   325   1,689
Total operating expense   70,846   217,768
Operating income   21,533   64,529
Other income and expense        
Interest expense, net   (464)   (3,950)
Other expense   (1,021)   (992)
Total other income and expense   (1,485)   (4,942)
Income before income taxes   20,048   59,587
Income tax expense   (6,930)   (20,286)
Net income from continuing operations, net of tax   13,118   39,301
Discontinued operations (Note 15)        
Gain on sale of Breg, Inc., net of tax   221   1,261
Loss from discontinued operations   (9,046)   (15,398)
Income tax benefit   3,267   5,617
Net loss from discontinued operations, net of tax   (5,558)   (8,520)
Net income   7,560   30,781
Net income (loss) per common share-basic:        
Net income from continuing operations, net of tax   $ 0.69   $ 2.08
Net loss from discontinued operations, net of tax   $ (0.29)   $ (0.45)
Net income (loss) per common share-basic   $ 0.40   $ 1.63
Net income (loss) per common share-diluted:        
Net income from continuing operations, net of tax   $ 0.67   $ 2.04
Net loss from discontinued operations, net of tax   $ (0.28)   $ (0.45)
Net income per common share-diluted   $ 0.39   $ 1.59
Weighted average number of common shares:        
Basic   19,078,590   18,861,374
Diluted   19,533,021   19,300,263
Comprehensive income   9,067   30,615
Adjustments [Member]
        
Product sales   (6,559)   (19,775)
Marketing service fees   (336)   (295)
Net sales   (6,895)   (20,070)
Cost of sales   2,011   5,320
Gross profit   (8,906)   (25,390)
Operating expenses        
Sales and marketing   (6,276)   (11,404)
Amortization of intangible assets   50   150
Impairment of goodwill         
Charges related to U.S. Government resolutions   48   (630)
Total operating expense   (6,178)   (11,884)
Operating income   (2,728)   (13,506)
Other income and expense        
Income before income taxes   (2,728)   (13,506)
Income tax expense   184   3,246
Net income from continuing operations, net of tax   (2,544)   (10,260)
Discontinued operations (Note 15)        
Loss from discontinued operations   (2)   1,024
Income tax benefit   2   132
Net loss from discontinued operations, net of tax       1,156
Net income   (2,544)   (9,104)
Net income (loss) per common share-basic:        
Net income from continuing operations, net of tax   $ (0.14)   $ (0.54)
Net loss from discontinued operations, net of tax       $ 0.06
Net income (loss) per common share-basic   $ (0.14)   $ (0.48)
Net income (loss) per common share-diluted:        
Net income from continuing operations, net of tax   $ (0.13)   $ (0.53)
Net loss from discontinued operations, net of tax   $ (0.01)   $ 0.07
Net income per common share-diluted   $ (0.14)   $ (0.46)
Weighted average number of common shares:        
Comprehensive income   $ (2,627)   $ (8,657)