Original and Further Restatement of the Consolidated Financial Statements - Schedule of Restatement to Previously Filed Consolidated Income Statements (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net sales	$ 100,014	$ 102,279
Cost of sales	26,773	25,841
Gross profit	73,241	76,438
Operating expenses
Sales and marketing	41,171	45,844
General and administrative	17,276	18,241
Research and development	5,933	5,741
Amortization of intangible assets	584	544
Costs related to the accounting review and restatement	8,306
Total operating expenses	73,270	70,370
Operating (loss) income	(29)	6,068
Other income and (expense)	(740)	4,222
Income (loss) before income taxes	(769)	10,290
Income tax expense	(1,179)	(4,364)
Net (loss) income from continuing operations	(1,948)	5,926
Previously Reported [Member]
Net sales		100,254
Cost of sales		22,699
Gross profit		77,555
Operating expenses
Sales and marketing		48,839
General and administrative		18,788
Research and development		5,400
Amortization of intangible assets		504
Total operating expenses		73,531
Operating (loss) income		4,024
Other income and (expense)		4,204
Income (loss) before income taxes		8,228
Income tax expense		(3,320)
Net (loss) income from continuing operations		4,908
Other Adjustments [Member]
Operating expenses
Income (loss) before income taxes	(1,600)	(300)
Further Restatement [Member]
Net sales	100,014	102,279
Cost of sales	(26,773)	(25,841)
Gross profit	73,241	76,438
Operating expenses
Sales and marketing	41,171	(45,844)
General and administrative	17,276	(18,241)
Research and development	5,933	(5,741)
Amortization of intangible assets	584	(544)
Costs related to the accounting review and restatement	8,306
Total operating expenses	73,270	(70,370)
Operating (loss) income	(29)	6,068
Other income and (expense)	(740)	4,222
Income (loss) before income taxes	(769)	10,290
Income tax expense	(1,179)	(4,364)
Net (loss) income from continuing operations	(1,948)	5,926
Further Restatement [Member] | Previously Reported [Member]
Net sales	101,342	103,373
Cost of sales	(22,632)	(25,617)
Gross profit	78,710	77,756
Operating expenses
Sales and marketing	43,871	(45,054)
General and administrative	17,545	(18,330)
Research and development	5,939	(5,741)
Amortization of intangible assets	584	(544)
Costs related to the accounting review and restatement	8,306
Total operating expenses	76,245	(69,669)
Operating (loss) income	2,465	8,087
Other income and (expense)	(747)	4,204
Income (loss) before income taxes	1,718	12,291
Income tax expense	(1,940)	(4,681)
Net (loss) income from continuing operations	(222)	7,610
Further Restatement [Member] | Co-Pay and Self-Pay Revenue [Member]
Net sales	(2,800)	(1,453)
Cost of sales
Gross profit	(2,800)	(1,453)
Operating expenses
Sales and marketing	(2,800)	1,453
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Total operating expenses	(2,800)	1,453
Operating (loss) income
Other income and (expense)
Income (loss) before income taxes
Income tax expense
Net (loss) income from continuing operations
Further Restatement [Member] | Bad Debt Timing [Member]
Net sales
Cost of sales
Gross profit
Operating expenses
Sales and marketing		(1,455)
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Total operating expenses		(1,455)
Operating (loss) income		(1,455)
Other income and (expense)
Income (loss) before income taxes		(1,455)
Income tax expense		509
Net (loss) income from continuing operations		(946)
Further Restatement [Member] | Accounts Receivable Reserve [Member]
Net sales	1,651	437
Cost of sales
Gross profit	1,651	437
Operating expenses
Sales and marketing	201	8
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Total operating expenses	201	8
Operating (loss) income	1,450	445
Other income and (expense)
Income (loss) before income taxes	1,450	445
Income tax expense	(508)	(156)
Net (loss) income from continuing operations	942	289
Further Restatement [Member] | Intercompany Profit [Member]
Net sales
Cost of sales	(2,966)	120
Gross profit	(2,966)	120
Operating expenses
Sales and marketing
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Total operating expenses
Operating (loss) income	(2,966)	120
Other income and (expense)
Income (loss) before income taxes	(2,966)	120
Income tax expense	1,039	(42)
Net (loss) income from continuing operations	(1,927)	78
Further Restatement [Member] | Inventory [Member]
Net sales
Cost of sales	(2,564)	(820)
Gross profit	(2,564)	(820)
Operating expenses
Sales and marketing
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Total operating expenses
Operating (loss) income	(2,564)	(820)
Other income and (expense)
Income (loss) before income taxes	(2,564)	(820)
Income tax expense	898	287
Net (loss) income from continuing operations	(1,666)	(533)
Further Restatement [Member] | Other Adjustments [Member]
Net sales	(179)	(78)
Cost of sales	1,389	476
Gross profit	(1,210)	398
Operating expenses
Sales and marketing	(101)	(796)
General and administrative	(269)	89
Research and development	(6)
Amortization of intangible assets
Costs related to the accounting review and restatement
Total operating expenses	(376)	(707)
Operating (loss) income	1,586	(309)
Other income and (expense)	7	18
Income (loss) before income taxes	1,593	(291)
Income tax expense	(668)	(281)
Net (loss) income from continuing operations	925	(572)
Further Restatement [Member] | Total Adjustments [Member]
Net sales	(1,328)	(1,094)
Cost of sales	(4,141)	(224)
Gross profit	(5,469)	(1,318)
Operating expenses
Sales and marketing	(2,700)	(790)
General and administrative	(269)	89
Research and development	(6)
Amortization of intangible assets
Costs related to the accounting review and restatement
Total operating expenses	(2,975)	(701)
Operating (loss) income	(2,494)	(2,019)
Other income and (expense)	7	18
Income (loss) before income taxes	(2,487)	(2,001)
Income tax expense	761	317
Net (loss) income from continuing operations	(1,726)	(1,684)
Original Restatement [Member]
Net sales		103,373
Cost of sales		25,617
Gross profit		77,756
Operating expenses
Sales and marketing		45,054
General and administrative		18,330
Research and development		5,741
Amortization of intangible assets		544
Charges related to U.S. Government resolutions
Total operating expenses		69,669
Operating (loss) income		8,087
Other income and (expense)		4,204
Income (loss) before income taxes		12,291
Income tax expense		(4,681)
Net (loss) income from continuing operations		7,610
Original Restatement [Member] | Royalties [Member]
Net sales
Cost of sales		2,030
Gross profit		(2,030)
Operating expenses
Sales and marketing		(2,030)
General and administrative
Research and development
Amortization of intangible assets
Charges related to U.S. Government resolutions
Total operating expenses		(2,030)
Operating (loss) income
Other income and (expense)
Income (loss) before income taxes
Income tax expense
Net (loss) income from continuing operations
Original Restatement [Member] | Distributor Revenue [Member]
Net sales		2,963
Cost of sales		471
Gross profit		2,492
Operating expenses
Sales and marketing		(2,073)
General and administrative
Research and development
Amortization of intangible assets
Charges related to U.S. Government resolutions
Total operating expenses		(2,073)
Operating (loss) income		4,565
Other income and (expense)
Income (loss) before income taxes		4,565
Income tax expense		(1,529)
Net (loss) income from continuing operations		3,036
Original Restatement [Member] | Inventory Reserves [Member]
Net sales
Cost of sales		86
Gross profit		(86)
Operating expenses
Sales and marketing
General and administrative
Research and development
Amortization of intangible assets
Charges related to U.S. Government resolutions
Total operating expenses
Operating (loss) income		(86)
Other income and (expense)
Income (loss) before income taxes		(86)
Income tax expense		29
Net (loss) income from continuing operations		(57)
Original Restatement [Member] | Previously Reported [Member]
Net sales		100,254
Cost of sales		22,699
Gross profit		77,555
Operating expenses
Sales and marketing		48,839
General and administrative		18,788
Research and development		5,400
Amortization of intangible assets		504
Charges related to U.S. Government resolutions
Total operating expenses		73,531
Operating (loss) income		4,024
Other income and (expense)		4,204
Income (loss) before income taxes		8,228
Income tax expense		(3,320)
Net (loss) income from continuing operations		4,908
Original Restatement [Member] | Other Adjustments [Member]
Net sales		156
Cost of sales		331
Gross profit		(175)
Operating expenses
Sales and marketing		318
General and administrative		(458)
Research and development		341
Amortization of intangible assets		40
Charges related to U.S. Government resolutions
Total operating expenses		241
Operating (loss) income		(416)
Other income and (expense)
Income (loss) before income taxes		(416)
Income tax expense		139
Net (loss) income from continuing operations		(277)
Original Restatement [Member] | Total Adjustments [Member]
Net sales		3,119
Cost of sales		2,918
Gross profit		201
Operating expenses
Sales and marketing		(3,785)
General and administrative		(458)
Research and development		341
Amortization of intangible assets		40
Charges related to U.S. Government resolutions
Total operating expenses		(3,862)
Operating (loss) income		4,063
Other income and (expense)
Income (loss) before income taxes		4,063
Income tax expense		(1,361)
Net (loss) income from continuing operations		$ 2,702