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Restatement of the Condensed Consolidated Financial Statements - Adjustments to Previously Filed Consolidated Income Statements (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
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 intangibles assets | 544 | 580
Charges related to U.S. Government resolutions |  | 310
Total operation expenses | 69,669 | 69,638
Operating income | 8,087 | 17,920
Other income and (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
Previously Reported [Member] |  |
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 intangibles assets | 504 | 530
Charges related to U.S. Government resolutions |  |
Total operation expenses | 73,531 | 71,671
Operating income | 4,024 | 22,431
Other income and (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
Total Adjustments [Member] |  |
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 intangibles assets | 40 | 50
Charges related to U.S. Government resolutions |  | 310
Total operation 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)
Distributor Revenue [Member] |  |
Net sales | 2,963 | (7,394)
Cost of sales | 471 | (1,471)
Gross profit | 2,492 | (5,923)
Operating expenses |  |
Sales and marketing | (2,073) | (417)
General and administrative |  |
Research and development |  |
Amortization of intangibles assets |  |
Charges related to U.S. Government resolutions |  |
Total operation expenses | (2,073) | (417)
Operating income | 4,565 | (5,506)
Other income and (expense) |  |
Income before income taxes | 4,565 | (5,506)
Income tax expense | (1,529) | 1,089
Net income from continuing operations, net of tax | 3,036 | (4,417)
Inventory Reserves [Member] |  |
Net sales |  |
Cost of sales | 86 | (1,212)
Gross profit | (86) | 1,212
Operating expenses |  |
Sales and marketing |  |
General and administrative |  |
Research and development |  |
Amortization of intangibles assets |  |
Charges related to U.S. Government resolutions |  |
Total operation expenses |  |
Operating income | (86) | 1,212
Other income and (expense) |  |
Income before income taxes | (86) | 1,212
Income tax expense | 29 | (240)
Net income from continuing operations, net of tax | (57) | 972
Royalties [Member] |  |
Net sales |  |
Cost of sales | 2,030 | 2,126
Gross profit | (2,030) | (2,126)
Operating expenses |  |
Sales and marketing | (2,030) | (2,126)
General and administrative |  |
Research and development |  |
Amortization of intangibles assets |  |
Charges related to U.S. Government resolutions |  |
Total operation expenses | (2,030) | (2,126)
Operating income |  |
Other income and (expense) |  |
Income before income taxes |  |
Income tax expense |  |
Net income from continuing operations, net of tax |  |
Other [Member] |  |
Net sales | 156 | 288
Cost of sales | 331 | (5)
Gross profit | (175) | 293
Operating expenses |  |
Sales and marketing | 318 | 150
General and administrative | (458) |
Research and development | 341 |
Amortization of intangibles assets | 40 | 50
Charges related to U.S. Government resolutions |  | 310
Total operation expenses | 241 | 510
Operating income | (416) | (217)
Other income and (expense) |  |
Income before income taxes | (416) | (217)
Income tax expense | 139 | 43
Net income from continuing operations, net of tax | $ (277) | $ (174)

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