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Restatement of the Consolidated Financial Statements - Adjustments to Previously Filed Consolidated Income Statements (Detail) (USD $)
In Thousands, unless otherwise specified
3 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, 2012
Dec. 31, 2011
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
Charges related to U.S. Government resolutions                   1,295 57,141
Total operation 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)                 295 (6,448) (7,953)
Income (loss) before income taxes                 (4,792) 70,188 (2,053)
Income tax expense                 (10,116) (25,138) (14,165)
Net income (loss) 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)
As Previously or Currently Reported [Member]
                     
Net sales          100,254 112,035 114,752 119,492 116,041    462,320 470,121
Cost of sales          22,699 18,504 22,373 23,676 21,939    86,492 92,619
Gross profit          77,555 93,531 92,379 95,816 94,102    375,828 377,502
Operating expenses                      
Sales and marketing                   200,343 200,145
General and administrative                   53,827 64,374
Research and development                   28,577 22,861
Amortization of intangible assets                   2,098 2,350
Charges related to U.S. Government resolutions                   1,973 56,463
Total operation expenses          73,531 69,050 70,846 75,251 71,671    286,818 346,193
Operating (loss) income          4,024 24,481 21,533 20,565 22,431    89,010 31,309
Other income and (expense)                   (6,282) (11,868)
Income (loss) before income taxes                   82,728 19,441
Income tax expense                   (28,792) (21,181)
Net income (loss) from continuing operations          4,908 14,636 13,118 13,967 12,215    53,936 (1,740)
Total Adjustment [Member]
                     
Net sales                   (14,739) (28,150)
Cost of sales                   11,761 2,908
Gross profit                   (26,500) (31,058)
Operating expenses                      
Sales and marketing                   (13,212) (6,634)
General and administrative                   (436) 107
Research and development                       
Amortization of intangible assets                   200 200
Charges related to U.S. Government resolutions                   (678) 678
Total operation expenses                   (14,126) (5,649)
Operating (loss) income                   (12,374) (25,409)
Other income and (expense)                   (166) 3,915
Income (loss) before income taxes                   (12,540) (21,494)
Income tax expense                   3,654 7,016
Net income (loss) from continuing operations                   (8,886) (14,478)
Distributor Revenue [Member]
                     
Net sales                   (14,777) (29,135)
Cost of sales                   (2,032) (8,289)
Gross profit                   (12,745) (20,846)
Operating expenses                      
Sales and marketing                   (6,629) (1,216)
General and administrative                   (2)  
Research and development                       
Amortization of intangible assets                       
Charges related to U.S. Government resolutions                       
Total operation expenses                   (6,631) (1,216)
Operating (loss) income                   (6,114) (19,630)
Other income and (expense)                       
Income (loss) before income taxes                   (6,114) (19,630)
Income tax expense                   1,782 6,408
Net income (loss) from continuing operations                   (4,332) (13,222)
Inventory Reserves [Member]
                     
Net sales                       
Cost of sales                   5,647 3,377
Gross profit                   (5,647) (3,377)
Operating expenses                      
Sales and marketing                       
General and administrative                       
Research and development                       
Amortization of intangible assets                       
Charges related to U.S. Government resolutions                       
Total operation expenses                       
Operating (loss) income                   (5,647) (3,377)
Other income and (expense)                       
Income (loss) before income taxes                   (5,647) (3,377)
Income tax expense                   1,645 1,102
Net income (loss) from continuing operations                   (4,002) (2,275)
Royalties [Member]
                     
Net sales                       
Cost of sales                   8,190 7,713
Gross profit                   (8,190) (7,713)
Operating expenses                      
Sales and marketing                   (8,190) (7,713)
General and administrative                       
Research and development                       
Amortization of intangible assets                       
Charges related to U.S. Government resolutions                       
Total operation expenses                   (8,190) (7,713)
Operating (loss) income                       
Other income and (expense)                       
Income (loss) before income taxes                       
Income tax expense                       
Net income (loss) from continuing operations                       
Other Adjustment [Member]
                     
Net sales                   38 985
Cost of sales                   (44) 107
Gross profit                   82 878
Operating expenses                      
Sales and marketing                   1,607 2,295
General and administrative                   (434) 107
Research and development                       
Amortization of intangible assets                   200 200
Charges related to U.S. Government resolutions                   (678) 678
Total operation expenses                   695 3,280
Operating (loss) income                   (613) (2,402)
Other income and (expense)                   (166) 3,915
Income (loss) before income taxes                   (779) 1,513
Income tax expense                   227 (494)
Net income (loss) from continuing operations                   $ (552) $ 1,019