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Restatement of the Condensed Consolidated Financial Statements - Effects of Restatement on Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Product sales $ 91,336 $ 97,608
Marketing service fees 12,037 11,328
Net sales 103,373 108,936
Cost of sales 25,617 21,378
Gross profit 77,756 87,558
Operating expenses    
Sales and marketing 45,054 47,128
General and administrative 18,330 14,570
Research and development 5,741 7,050
Amortization of intangible assets 544 580
Charges related to US Government Resolutions    310
Total operating expenses 69,669 69,638
Operating income 8,087 17,920
Other income and expense    
Interest expense, net (560) (2,221)
Other income (expense), net 4,764 (631)
Total other income (expense) 4,204 (2,852)
Income before income taxes 12,291 15,068
Income tax expense (4,681) (6,471)
Net income from continuing operations, net of tax 7,610 8,597
Discontinued operations (Note 16)    
(Loss) income from discontinued operations (4,434) 527
Income tax benefit 1,324 283
Net (loss) income from discontinued operations, net of tax (3,110) 810
Net income 4,500 9,407
Net income (loss) per common share- basic:    
Net income from continuing operations, net of tax $ 0.39 $ 0.46
Net (loss) income from discontinued operations, net of tax $ (0.16) $ 0.04
Net income per common share- basic $ 0.23 $ 0.50
Net income (loss) per common share- diluted:    
Net income from continuing operations, net of tax $ 0.39 $ 0.45
Net (loss) income from discontinued operations, net of tax $ (0.16) $ 0.04
Net income per common share- diluted $ 0.23 $ 0.49
Weighted average number of common shares:    
Basic 19,431,093 18,675,694
Diluted 19,691,141 19,116,195
Comprehensive (loss) income 1,474 11,808
Previously Reported [Member]
    
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
Charges related to US Government Resolutions      
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), net 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 16)    
(Loss) income from discontinued operations (4,432) (506)
Income tax benefit 1,640 306
Net (loss) income 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) income from discontinued operations, net of tax $ (0.14) $ (0.01)
Net income per common share- basic $ 0.11 $ 0.64
Net income (loss) per common share- diluted:    
Net income from continuing operations, net of tax $ 0.25 $ 0.64
Net (loss) income 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
Adjustments [Member]
    
Product sales 2,978 (7,212)
Marketing service fees 141 106
Net sales 3,119 (7,106)
Cost of sales 2,918 (562)
Gross profit 201 (6,544)
Operating expenses    
Sales and marketing (3,785) (2,393)
General and administrative (458)  
Research and development 341  
Amortization of intangible assets 40 50
Charges related to US Government Resolutions   310
Total operating expenses (3,862) (2,033)
Operating income 4,063 (4,511)
Other income and expense    
Income before income taxes 4,063 (4,511)
Income tax expense (1,361) 892
Net income from continuing operations, net of tax 2,702 (3,619)
Discontinued operations (Note 16)    
(Loss) income from discontinued operations (2) 1,033
Income tax benefit (316) (23)
Net (loss) income from discontinued operations, net of tax (318) 1,010
Net income 2,384 (2,609)
Net income (loss) per common share- basic:    
Net income from continuing operations, net of tax $ 0.14 $ (0.19)
Net (loss) income from discontinued operations, net of tax $ (0.02) $ 0.05
Net income per common share- basic $ 0.12 $ (0.14)
Net income (loss) per common share- diluted:    
Net income from continuing operations, net of tax $ 0.14 $ (0.19)
Net (loss) income from discontinued operations, net of tax $ (0.02) $ 0.05
Net income per common share- diluted $ 0.12 $ (0.14)
Weighted average number of common shares:    
Basic     
Diluted     
Comprehensive (loss) income $ 2,490 $ (2,918)