Original and Further Restatement of the Consolidated Financial Statements - Effects of Original Restatement and Further Restatement to Previously Filed Consolidated Income Statements (Detail) (USD $)
In Thousands, unless otherwise specified

Original and Further Restatement of the Consolidated Financial Statements - Effects of Original Restatement and Further Restatement to Previously Filed Consolidated Income Statements (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								6 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, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net sales	$ 105,886us-gaap_SalesRevenueNet	$ 91,806us-gaap_SalesRevenueNet	$ 97,640us-gaap_SalesRevenueNet	$ 102,279us-gaap_SalesRevenueNet	$ 115,607us-gaap_SalesRevenueNet	$ 105,818us-gaap_SalesRevenueNet	$ 111,601us-gaap_SalesRevenueNet	$ 107,163us-gaap_SalesRevenueNet		$ 397,611us-gaap_SalesRevenueNet	$ 440,189us-gaap_SalesRevenueNet	$ 435,519us-gaap_SalesRevenueNet
Cost of sales	34,123us-gaap_CostOfGoodsAndServicesSold	25,064us-gaap_CostOfGoodsAndServicesSold	21,884us-gaap_CostOfGoodsAndServicesSold	25,841us-gaap_CostOfGoodsAndServicesSold	26,751us-gaap_CostOfGoodsAndServicesSold	24,887us-gaap_CostOfGoodsAndServicesSold	24,943us-gaap_CostOfGoodsAndServicesSold	24,145us-gaap_CostOfGoodsAndServicesSold		106,912us-gaap_CostOfGoodsAndServicesSold	100,726us-gaap_CostOfGoodsAndServicesSold	96,415us-gaap_CostOfGoodsAndServicesSold
Gross profit	71,763us-gaap_GrossProfit	66,742us-gaap_GrossProfit	75,756us-gaap_GrossProfit	76,438us-gaap_GrossProfit	88,856us-gaap_GrossProfit	80,931us-gaap_GrossProfit	86,658us-gaap_GrossProfit	83,018us-gaap_GrossProfit		290,699us-gaap_GrossProfit	339,463us-gaap_GrossProfit	339,104us-gaap_GrossProfit
Operating expenses
Sales and marketing										175,468us-gaap_SellingAndMarketingExpense	178,771us-gaap_SellingAndMarketingExpense	185,156us-gaap_SellingAndMarketingExpense
General and administrative										64,830us-gaap_GeneralAndAdministrativeExpense	53,650us-gaap_GeneralAndAdministrativeExpense	64,785us-gaap_GeneralAndAdministrativeExpense
Research and development										26,768us-gaap_ResearchAndDevelopmentExpense	28,577us-gaap_ResearchAndDevelopmentExpense	22,861us-gaap_ResearchAndDevelopmentExpense
Amortization of intangible assets										2,687us-gaap_AmortizationOfIntangibleAssets	2,298us-gaap_AmortizationOfIntangibleAssets	2,550us-gaap_AmortizationOfIntangibleAssets
Costs related to the accounting review and restatement										12,945
Charges related to U.S. Government resolutions											1,295	57,141
Impairment of goodwill									19,193us-gaap_GoodwillImpairmentLoss	19,193us-gaap_GoodwillImpairmentLoss
Total operation expenses	81,842us-gaap_OperatingExpenses	80,843us-gaap_OperatingExpenses	68,836us-gaap_OperatingExpenses	70,370us-gaap_OperatingExpenses	62,338us-gaap_OperatingExpenses	63,988us-gaap_OperatingExpenses	70,036us-gaap_OperatingExpenses	68,229us-gaap_OperatingExpenses		301,891us-gaap_OperatingExpenses	264,591us-gaap_OperatingExpenses	332,493us-gaap_OperatingExpenses
Operating (loss) income	(10,079)us-gaap_OperatingIncomeLoss	(14,101)us-gaap_OperatingIncomeLoss	6,920us-gaap_OperatingIncomeLoss	6,068us-gaap_OperatingIncomeLoss	26,518us-gaap_OperatingIncomeLoss	16,943us-gaap_OperatingIncomeLoss	16,622us-gaap_OperatingIncomeLoss	14,789us-gaap_OperatingIncomeLoss		(11,192)us-gaap_OperatingIncomeLoss	74,872us-gaap_OperatingIncomeLoss	6,611us-gaap_OperatingIncomeLoss
Other income and (expense)										589us-gaap_NonoperatingIncomeExpense	(5,807)us-gaap_NonoperatingIncomeExpense	(7,974)us-gaap_NonoperatingIncomeExpense
(Loss) before income taxes										(10,603)	69,065	(1,363)
Income tax expense										(7,602)us-gaap_IncomeTaxExpenseBenefit	(23,944)us-gaap_IncomeTaxExpenseBenefit	(14,443)us-gaap_IncomeTaxExpenseBenefit	6,028us-gaap_IncomeTaxExpenseBenefit
Net income (loss) from continuing operations	(9,639)	(16,504)	2,012	5,926	17,518	9,312	11,421	6,870		(18,205)	45,121	(15,806)
As Originally Restated in the 2012 Form 10-K/A [Member]
Net sales					117,365	107,857	113,423				447,581	441,971
Cost of sales					24,944	24,384	27,547				98,253	95,527
Gross profit					92,421	83,473	85,876				349,328	346,444
Operating expenses
Sales and marketing											187,131	193,511
General and administrative											53,391	64,481
Research and development											28,577	22,861
Amortization of intangible assets											2,298	2,550
Charges related to U.S. Government resolutions											1,295	57,141
Total operation expenses					66,808	64,668	71,578				272,692	340,544
Operating (loss) income					25,613	18,805	14,298				76,636	5,900
Other income and (expense)											(6,448)	(7,953)
(Loss) before income taxes											(70,188)	(2,053)
Income tax expense											(25,138)	(14,165)
Net income (loss) from continuing operations					16,009	10,574	9,870				45,050	(16,218)
As Reported in the 2012 Form 10-K Prior to Original Restatement [Member]
Net sales					112,035	114,752	119,492	116,041			462,320	470,121
Cost of sales					18,504	22,373	23,676	21,939			86,492	92,619
Gross profit					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					69,050	70,846	75,251	71,671			286,818	346,193
Operating (loss) income					24,481	21,533	20,565	22,431			89,010	31,309
Other income and (expense)											(6,282)	(11,868)
(Loss) before income taxes											82,728	19,441
Income tax expense											(28,792)	(21,181)
Net income (loss) from continuing operations					14,636	13,118	13,967	12,215			53,936	(1,740)
Further Restatement [Member]
Net sales										397,611	438,532	435,519
Cost of sales										106,912	100,726	96,415
Gross profit										290,699	339,463	339,104
Operating expenses
Sales and marketing										175,468	178,771	185,156
General and administrative										64,830	53,650	64,785
Research and development										26,768	28,577	22,861
Amortization of intangible assets										2,687	2,298	2,550
Costs related to the accounting review and restatement										12,945
Charges related to U.S. Government resolutions											1,295	57,141
Impairment of goodwill										19,193
Total operation expenses										301,891	264,591	332,493
Operating (loss) income										(11,192)	74,872	6,611
Other income and (expense)										589	(5,807)	(7,974)
(Loss) before income taxes										(10,603)	69,065	(1,363)
Income tax expense										(7,602)	(23,944)	14,443
Net income (loss) from continuing operations										(18,205)	45,121	(15,806)
Further Restatement [Member] \| As Originally Restated in the 2012 Form 10-K/A [Member]
Net sales										400,534	447,581	441,971
Cost of sales										102,300	98,253	95,527
Gross profit										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
Costs related to the accounting review and restatement										12,945
Charges related to U.S. Government resolutions											1,295	57,141
Impairment of goodwill										19,193
Total operation expenses										303,321	272,692	340,544
Operating (loss) income										(5,087)	76,636	5,900
Other income and (expense)										295	(6,448)	(7,953)
(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										(14,908)	45,050	(16,218)
Further Restatement [Member] \| Co-Pay and Self-Pay Revenue [Member]
Net sales										(2,242)	(9,049)	(5,960)
Cost of sales
Gross profit										(2,242)	(9,049)	(5,960)
Operating expenses
Sales and marketing										(2,242)	(9,049)	(5,960)
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Charges related to U.S. Government resolutions
Impairment of goodwill
Total operation expenses										(2,242)	(9,049)	(5,960)
Operating (loss) income
Other income and (expense)
(Loss) before income taxes
Income tax expense
Net income (loss) from continuing operations
Further Restatement [Member] \| Bad Debt Timing [Member]
Net sales
Cost of sales
Gross profit
Operating expenses
Sales and marketing										1,455	1,097	(2,143)
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Charges related to U.S. Government resolutions
Impairment of goodwill
Total operation expenses										1,455	1,097	(2,143)
Operating (loss) income										(1,455)	(1,097)	2,143
Other income and (expense)
(Loss) before income taxes										(1,455)	(1,097)	2,143
Income tax expense										509	384	(752)
Net income (loss) from continuing operations										(946)	(713)	1,391
Further Restatement [Member] \| Accounts Receivable Reserve [Member]
Net sales										(582)	1,653	(439)
Cost of sales
Gross profit										(582)	1,653	(439)
Operating expenses
Sales and marketing										122	(408)	(252)
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Charges related to U.S. Government resolutions
Impairment of goodwill
Total operation expenses										122	(408)	(252)
Operating (loss) income										(704)	2,061	(187)
Other income and (expense)
(Loss) before income taxes										(704)	2,061	(187)
Income tax expense										246	(721)	66
Net income (loss) from continuing operations										(458)	1,340	(121)
Further Restatement [Member] \| Intercompany Profit [Member]
Net sales
Cost of sales										1,090	207	253
Gross profit										(1,090)	(207)	(253)
Operating expenses
Sales and marketing
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Charges related to U.S. Government resolutions
Impairment of goodwill
Total operation expenses
Operating (loss) income										(1,090)	(207)	(253)
Other income and (expense)
(Loss) before income taxes										(1,090)	(207)	(253)
Income tax expense										381	72	89
Net income (loss) from continuing operations										(709)	(135)	(164)
Further Restatement [Member] \| Inventory [Member]
Net sales
Cost of sales										3,688	1,774	321
Gross profit										(3,688)	(1,774)	(321)
Operating expenses
Sales and marketing
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Charges related to U.S. Government resolutions
Impairment of goodwill
Total operation expenses
Operating (loss) income										(3,688)	(1,774)	(321)
Other income and (expense)
(Loss) before income taxes										(3,688)	(1,774)	(321)
Income tax expense										1,290	621	113
Net income (loss) from continuing operations										(2,398)	(1,153)	(208)
Further Restatement [Member] \| Total Adjustments [Member]
Net sales										(2,923)	(9,049)	(6,452)
Cost of sales										4,612	2,473	888
Gross profit										(7,535)	(9,865)	(7,340)
Operating expenses
Sales and marketing										(1,113)	(8,360)	(8,355)
General and administrative										(317)	259	304
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Charges related to U.S. Government resolutions
Impairment of goodwill
Total operation expenses										(1,430)	(8,101)	(8,051)
Operating (loss) income										(6,105)	(1,764)	711
Other income and (expense)										294	641	(21)
(Loss) before income taxes										(5,811)	(1,123)	690
Income tax expense										2,514	1,194	(278)
Net income (loss) from continuing operations										(3,297)	71	412
Further Restatement [Member] \| Other Adjustments [Member]
Net sales										(99)	4	(53)
Cost of sales										(166)	492	314
Gross profit										67	(488)	(367)
Operating expenses
Sales and marketing										(448)
General and administrative										(317)	259	304
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Charges related to U.S. Government resolutions
Impairment of goodwill
Total operation expenses										(765)	259	304
Operating (loss) income										832	(747)	(671)
Other income and (expense)										294	641	(21)
(Loss) before income taxes										(1,126)	(106)	(692)
Income tax expense										88	838	206
Net income (loss) from continuing operations										1,214	732	(486)
Original Restatement [Member]
Net sales											447,581	441,971
Cost of sales											98,253	95,527
Gross profit											349,328	346,444
Operating expenses
Sales and marketing											187,131	193,511
General and administrative											53,391	64,481
Research and development											28,577	22,861
Amortization of intangible assets											2,298	2,550
Charges related to U.S. Government resolutions											1,295	57,141
Total operation expenses											272,692	340,544
Operating (loss) income											76,636	5,900
Other income and (expense)											(6,448)	(7,953)
(Loss) before income taxes											70,188	(2,053)
Income tax expense											(25,138)	(14,165)
Net income (loss) from continuing operations											45,050	(16,218)
Original Restatement [Member] \| 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)
(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)
Original Restatement [Member] \| 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)
(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)
Original Restatement [Member] \| Total Adjustments [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
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
(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)
Original Restatement [Member] \| As Reported in the 2012 Form 10-K Prior to Original Restatement [Member]
Net sales											462,320	470,121
Cost of sales											86,492	92,619
Gross profit											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											286,818	346,193
Operating (loss) income											89,010	31,309
Other income and (expense)											(6,282)	(11,868)
(Loss) before income taxes											82,728	19,441
Income tax expense											(28,792)	(21,181)
Net income (loss) from continuing operations											53,936	(1,740)
Original Restatement [Member] \| Other Adjustments [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
(Loss) before income taxes											(779)	1,513
Income tax expense											227	(494)
Net income (loss) from continuing operations											(552)	1,019
Original Restatement [Member] \| 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)
(Loss) before income taxes
Income tax expense
Net income (loss) from continuing operations