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Restatement of the Condensed Consolidated Financial Statements - Adjustments to Previously Filed Consolidated Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
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
Charges related to U.S. Government resolutions   373   1,059
Total operating expenses 84,418 64,668 223,317 205,884
Operating income (15,600) 18,805 1,291 51,023
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
Previously Reported [Member]
        
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
Charges related to U.S. Government resolutions   325   1,689
Total operating expenses   70,846   217,768
Operating income   21,533   64,529
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
Total Adjustments [Member]
        
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
Charges related to U.S. Government resolutions   48   (630)
Total operating expenses   (6,178)   (11,884)
Operating income   (2,728)   (13,506)
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)
Distributor Revenue [Member]
        
Net sales   (6,422)   (19,678)
Cost of sales   (265)   (3,837)
Gross profit   (6,157)   (15,841)
Operating expenses        
Sales and marketing   (4,212)   (5,156)
Total operating expenses   (4,212)   (5,156)
Operating income   (1,945)   (10,685)
Income before income taxes   (1,945)   (10,685)
Income tax (expense)   131   2,340
Net income from continuing operations, net of tax   (1,814)   (8,345)
Inventory Reserves [Member]
        
Cost of sales   123   2,791
Gross profit   (123)   (2,791)
Operating expenses        
Operating income   (123)   (2,791)
Income before income taxes   (123)   (2,791)
Income tax (expense)   8   1,111
Net income from continuing operations, net of tax   (115)   (1,680)
Royalties [Member]
        
Cost of sales   2,018   6,223
Gross profit   (2,018)   (6,223)
Operating expenses        
Sales and marketing   (2,018)   (6,223)
Total operating expenses   (2,018)   (6,223)
Other [Member]
        
Net sales   (473)   (392)
Cost of sales   135   143
Gross profit   (608)   (535)
Operating expenses        
Sales and marketing   (46)   (25)
Amortization of intangible assets   50   150
Charges related to U.S. Government resolutions   48   (630)
Total operating expenses   52   (505)
Operating income   (660)   (30)
Income before income taxes   (660)   (30)
Income tax (expense)   45   (205)
Net income from continuing operations, net of tax   $ (615)   $ (235)