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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, 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

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