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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Net sales | $ 98,280 | $ 113,423 | $ 201,653 | $ 222,359
Cost of sales | 20,246 | 27,547 | 45,863 | 48,925
Gross profit | 78,034 | 85,876 | 155,790 | 173,434
Operating expenses |  |  |  |
Sales and marketing | 44,910 | 47,075 | 89,964 | 94,203
General and administrative | 15,204 | 14,295 | 33,534 | 28,865
Research and development | 8,551 | 9,252 | 14,292 | 16,302
Amortization of intangibles assets | 565 | 580 | 1,109 | 1,160
Charges related to U.S. Government resolutions |  | 376 |  | 686
Total operating expenses | 69,230 | 71,578 | 138,899 | 141,216
Operating income | 8,804 | 14,298 | 16,891 | 32,218
Other income and (expense) | (1,677) | (605) | 2,527 | (3,457)
Income before income taxes | 7,127 | 13,693 | 19,418 | 28,761
Income tax expense | (2,997) | (3,823) | (7,678) | (10,294)
Net income from continuing operations, net of tax | 4,130 | 9,870 | 11,740 | 18,467
Previously Reported [Member] |  |  |  |
Net sales |  | 119,492 |  | 235,534
Cost of sales |  | 23,676 |  | 45,616
Gross profit |  | 95,816 |  | 189,918
Operating expenses |  |  |  |
Sales and marketing |  | 49,810 |  | 99,331
General and administrative |  | 14,295 |  | 28,865
Research and development |  | 9,252 |  | 16,302
Amortization of intangibles assets |  | 530 |  | 1,060
Charges related to U.S. Government resolutions |  | 1,364 |  | 1,364
Total operating expenses |  | 75,251 |  | 146,922
Operating income |  | 20,565 |  | 42,996
Other income and (expense) |  | (605) |  | (3,457)
Income before income taxes |  | 19,960 |  | 39,539
Income tax expense |  | (5,993) |  | (13,356)
Net income from continuing operations, net of tax |  | 13,967 |  | 26,183
Total Adjustments [Member] |  |  |  |
Net sales |  | (6,069) |  | (13,175)
Cost of sales |  | 3,871 |  | 3,309
Gross profit |  | (9,940) |  | (16,484)
Operating expenses |  |  |  |
Sales and marketing |  | (2,735) |  | (5,128)
Amortization of intangibles assets |  | 50 |  | 100
Charges related to U.S. Government resolutions |  | (988) |  | (678)
Total operating expenses |  | (3,673) |  | (5,706)
Operating income |  | (6,267) |  | (10,778)
Income before income taxes |  | (6,267) |  | (10,778)
Income tax expense |  | 2,170 |  | 3,062
Net income from continuing operations, net of tax |  | (4,097) |  | (7,716)
Distributor Revenue [Member] |  |  |  |
Net sales |  | (5,862) |  | (13,256)
Cost of sales |  | (2,101) |  | (3,572)
Gross profit |  | (3,761) |  | (9,684)
Operating expenses |  |  |  |
Sales and marketing |  | (527) |  | (944)
Total operating expenses |  | (527) |  | (944)
Operating income |  | (3,234) |  | (8,740)
Income before income taxes |  | (3,234) |  | (8,740)
Income tax expense |  | 1,120 |  | 2,209
Net income from continuing operations, net of tax |  | (2,114) |  | (6,531)
Inventory Reserves [Member] |  |  |  |
Cost of sales |  | 3,880 |  | 2,668
Gross profit |  | (3,880) |  | (2,668)
Operating expenses |  |  |  |
Operating income |  | (3,880) |  | (2,668)
Income before income taxes |  | (3,880) |  | (2,668)
Income tax expense |  | 1,343 |  | 1,103
Net income from continuing operations, net of tax |  | (2,537) |  | (1,565)
Royalties [Member] |  |  |  |
Cost of sales |  | 2,079 |  | 4,205
Gross profit |  | (2,079) |  | (4,205)
Operating expenses |  |  |  |
Sales and marketing |  | (2,079) |  | (4,205)
Total operating expenses |  | (2,079) |  | (4,205)
Other [Member] |  |  |  |
Net sales |  | (207) |  | 81
Cost of sales |  | 13 |  | 8
Gross profit |  | (220) |  | 73
Operating expenses |  |  |  |
Sales and marketing |  | (129) |  | 21
Amortization of intangibles assets |  | 50 |  | 100
Charges related to U.S. Government resolutions |  | (988) |  | (678)
Total operating expenses |  | (1,067) |  | (557)
Operating income |  | 847 |  | 630
Income before income taxes |  | 847 |  | 630
Income tax expense |  | (293) |  | (250)
Net income from continuing operations, net of tax |  | $ 554 |  | $ 380

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