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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
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net Sales | $ 117,365 | $ 107,857 | $ 113,423 | $ 108,936 | $ 118,639 | $ 111,510 | $ 108,216 | $ 103,606 | $ 447,581 | $ 441,971 | $ 462,571
Cost of sales | 24,944 | 24,384 | 27,547 | 21,378 | 27,300 | 23,126 | 22,755 | 22,346 | 98,253 | 95,527 | 97,093
Gross profit | 92,421 | 83,473 | 85,876 | 87,558 | 91,339 | 88,384 | 85,461 | 81,260 | 349,328 | 346,444 | 365,478
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | 187,131 | 193,511 | 196,113
General and administrative |  |  |  |  |  |  |  |  | 53,391 | 64,481 | 73,010
Research and development |  |  |  |  |  |  |  |  | 28,577 | 22,861 | 27,958
Amortization of intangibles assets |  |  |  |  |  |  |  |  | 2,298 | 2,550 | 2,413
Charges related to U.S. Government resolutions |  |  |  |  |  |  |  |  | 1,295 | 57,141 |
Total operation expenses | 66,808 | 64,668 | 71,578 | 69,638 | 83,165 | 67,417 | 73,102 | 116,860 | 272,692 | 340,544 | 299,494
Operating income | 25,613 | 18,805 | 14,298 | 17,920 | 8,174 | 20,967 | 12,359 | (35,600) | 76,636 | 5,900 | 65,984
Other income and (expense) |  |  |  |  |  |  |  |  | (6,448) | (7,953) | (10,956)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 70,188 | (2,053) | 55,028
Income tax expense |  |  |  |  |  |  |  |  | (25,138) | (14,165) | (24,031)
Net income from continuing operations, net of tax | 16,009 | 10,574 | 9,870 | 8,597 | 7,652 | 11,300 | 6,579 | (41,749) | 45,050 | (16,218) | 30,997
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales | 112,035 | 114,752 | 119,492 | 116,041 | 123,085 | 117,306 | 116,670 | 113,060 | 462,320 | 470,121 | 460,629
Cost of sales | 18,504 | 22,373 | 23,676 | 21,939 | 23,239 | 23,854 | 23,186 | 22,340 | 86,492 | 92,619 | 90,461
Gross profit | 93,531 | 92,379 | 95,816 | 94,102 | 99,846 | 93,452 | 93,484 | 90,720 | 375,828 | 377,502 | 370,168
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | 200,343 | 200,145 | 200,835
General and administrative |  |  |  |  |  |  |  |  | 53,827 | 64,374 | 72,912
Research and development |  |  |  |  |  |  |  |  | 28,577 | 22,861 | 27,958
Amortization of intangibles assets |  |  |  |  |  |  |  |  | 2,098 | 2,350 | 2,213
Charges related to U.S. Government resolutions |  |  |  |  |  |  |  |  | 1,973 | 56,463 |
Total operation expenses | 69,050 | 70,846 | 75,251 | 71,671 | 84,035 | 69,853 | 74,088 | 118,217 | 286,818 | 346,193 | 303,918
Operating income | 24,481 | 21,533 | 20,565 | 22,431 | 15,811 | 23,599 | 19,396 | (27,497) | 89,010 | 31,309 | 66,250
Other income and (expense) |  |  |  |  |  |  |  |  | (6,282) | (11,868) | (15,886)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 82,728 | 19,441 | 50,364
Income tax expense |  |  |  |  |  |  |  |  | (28,792) | (21,181) | (22,606)
Net income from continuing operations, net of tax | 14,636 | 13,118 | 13,967 | 12,215 | 11,530 | 12,951 | 10,519 | (36,740) | 53,936 | (1,740) | 27,758
Total Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | (14,739) | (28,150) | 1,942
Cost of sales |  |  |  |  |  |  |  |  | 11,761 | 2,908 | 6,632
Gross profit |  |  |  |  |  |  |  |  | (26,500) | (31,058) | (4,690)
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | (13,212) | (6,634) | (4,722)
General and administrative |  |  |  |  |  |  |  |  | (436) | 107 | 98
Amortization of intangibles assets |  |  |  |  |  |  |  |  | 200 | 200 | 200
Charges related to U.S. Government resolutions |  |  |  |  |  |  |  |  | (678) | 678 |
Total operation expenses |  |  |  |  |  |  |  |  | (14,126) | (5,649) | (4,424)
Operating income |  |  |  |  |  |  |  |  | (12,374) | (25,409) | (266)
Other income and (expense) |  |  |  |  |  |  |  |  | (166) | 3,915 | 4,930
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (12,540) | (21,494) | 4,664
Income tax expense |  |  |  |  |  |  |  |  | 3,654 | 7,016 | (1,425)
Net income from continuing operations, net of tax |  |  |  |  |  |  |  |  | (8,886) | (14,478) | 3,239
Distributor Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | (14,777) | (29,135) | 2,088
Cost of sales |  |  |  |  |  |  |  |  | (2,032) | (8,289) | (323)
Gross profit |  |  |  |  |  |  |  |  | (12,745) | (20,846) | 2,411
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | (6,629) | (1,216) | (275)
General and administrative |  |  |  |  |  |  |  |  | (2) |  |
Total operation expenses |  |  |  |  |  |  |  |  | (6,631) | (1,216) | (275)
Operating income |  |  |  |  |  |  |  |  | (6,114) | (19,630) | 2,686
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (6,114) | (19,630) | 2,686
Income tax expense |  |  |  |  |  |  |  |  | 1,782 | 6,408 | (821)
Net income from continuing operations, net of tax |  |  |  |  |  |  |  |  | (4,332) | (13,222) | 1,865
Inventory Reserves [Member] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 5,647 | 3,377 | 2,281
Gross profit |  |  |  |  |  |  |  |  | (5,647) | (3,377) | (2,281)
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (5,647) | (3,377) | (2,281)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (5,647) | (3,377) | (2,281)
Income tax expense |  |  |  |  |  |  |  |  | 1,645 | 1,102 | 697
Net income from continuing operations, net of tax |  |  |  |  |  |  |  |  | (4,002) | (2,275) | (1,584)
Royalties [Member] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 8,190 | 7,713 | 5,386
Gross profit |  |  |  |  |  |  |  |  | (8,190) | (7,713) | (5,386)
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | (8,190) | (7,713) | (5,386)
Total operation expenses |  |  |  |  |  |  |  |  | (8,190) | (7,713) | (5,386)
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 38 | 985 | (146)
Cost of sales |  |  |  |  |  |  |  |  | (44) | 107 | (712)
Gross profit |  |  |  |  |  |  |  |  | 82 | 878 | 566
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | 1,607 | 2,295 | 939
General and administrative |  |  |  |  |  |  |  |  | (434) | 107 | 98
Amortization of intangibles assets |  |  |  |  |  |  |  |  | 200 | 200 | 200
Charges related to U.S. Government resolutions |  |  |  |  |  |  |  |  | (678) | 678 |
Total operation expenses |  |  |  |  |  |  |  |  | 695 | 3,280 | 1,237
Operating income |  |  |  |  |  |  |  |  | (613) | (2,402) | (671)
Other income and (expense) |  |  |  |  |  |  |  |  | (166) | 3,915 | 4,930
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (779) | 1,513 | 4,259
Income tax expense |  |  |  |  |  |  |  |  | 227 | (494) | (1,301)
Net income from continuing operations, net of tax |  |  |  |  |  |  |  |  | $ (552) | $ 1,019 | $ 2,958

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