Original and Further Restatement of the Consolidated Financial Statements - Effects of Further Adjustments to Previously Filed Consolidated Income Statements (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net sales	$ 100,994	$ 91,806	$ 301,933	$ 291,725
Cost of sales	25,268	25,064	77,455	72,789
Gross profit	75,726	66,742	224,538	218,936
Operating expenses
Sales and marketing	40,998	39,076	124,182	129,459
General and administrative	18,814	12,933	53,643	46,355
Research and development	6,572	6,361	18,818	20,653
Amortization of intangible assets	508	616	1,753	1,725
Costs related to the accounting review and restatement	2,326	2,664	12,959	2,664
Impairment of goodwill		19,193		19,193
Total operating expenses	69,218	80,843	211,355	220,049
Operating (loss) income	6,508	(14,101)	13,183	(1,113)
Other income and (expense)	(1,717)	(2,020)	(2,586)	540
Loss before income taxes	4,791	(16,121)	10,597	(573)
Income tax expense	(4,763)	(383)	(9,251)	(7,993)
Net loss from continuing operations	28	(16,504)	1,346	(8,566)
Previously Reported [Member]
Net sales		92,738		294,391
Cost of sales		23,920		69,783
Gross profit		68,818		224,608
Operating expenses
Sales and marketing		42,382		132,346
General and administrative		13,202		46,736
Research and development		6,361		20,653
Amortization of intangible assets		616		1,725
Costs related to the accounting review and restatement		2,664		2,664
Impairment of goodwill		19,193		19,193
Total operating expenses		84,418		223,317
Operating (loss) income		(15,600)		1,291
Other income and (expense)		(2,036)		491
Loss before income taxes		(17,636)		1,782
Income tax expense		(448)		(8,126)
Net loss from continuing operations		(18,084)		(6,344)
Restatement Adjustments [Member]
Net sales		(932)		(2,666)
Cost of sales		1,144		3,006
Gross profit		(2,076)		(5,672)
Operating expenses
Sales and marketing		(3,306)		(2,887)
General and administrative		(269)		(381)
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Impairment of goodwill
Total operating expenses		(3,575)		(3,268)
Operating (loss) income		1,499		(2,404)
Other income and (expense)		16		49
Loss before income taxes		1,515		(2,355)
Income tax expense		65		133
Net loss from continuing operations		1,580		(2,222)
Co-Pay and Self-Pay Revenue [Member]
Net sales		(1,191)		(2,980)
Cost of sales
Gross profit		(1,191)		(2,980)
Operating expenses
Sales and marketing		(1,191)		(2,980)
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Impairment of goodwill
Total operating expenses		(1,191)		(2,980)
Operating (loss) income
Other income and (expense)
Loss before income taxes
Income tax expense
Net loss from continuing operations
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
Impairment of goodwill
Total operating expenses				1,455
Operating (loss) income				(1,455)
Other income and (expense)
Loss before income taxes				(1,455)
Income tax expense				509
Net loss from continuing operations				(964)
Accounts Receivable Reserve [Member]
Net sales		240		364
Cost of sales
Gross profit		240		364
Operating expenses
Sales and marketing		14		54
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Impairment of goodwill
Total operating expenses		14		54
Operating (loss) income		226		310
Other income and (expense)
Loss before income taxes		226		310
Income tax expense		(79)		(109)
Net loss from continuing operations		147		201
Intercompany Profit [Member]
Net sales
Cost of sales		770		1,012
Gross profit		(770)		(1,012)
Operating expenses
Sales and marketing
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Operating (loss) income		(770)		(1,012)
Loss before income taxes		(770)		(1,012)
Income tax expense		(270)		354
Net loss from continuing operations		(500)		(658)
Inventory Adjustments [Member]
Net sales
Cost of sales		1,320		3,399
Gross profit		(1,320)		(3,399)
Operating expenses
Sales and marketing
General and administrative
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Impairment of goodwill
Total operating expenses
Operating (loss) income		(1,320)		(3,399)
Other income and (expense)
Loss before income taxes		(1,320)		(3,399)
Income tax expense		462		1,190
Net loss from continuing operations		(850)		(2,209)
Other Adjustments [Member]
Net sales		19		(50)
Cost of sales		(946)		(1,405)
Gross profit		965		1,355
Operating expenses
Sales and marketing		(2,129)		(1,416)
General and administrative		(269)		(381)
Research and development
Amortization of intangible assets
Costs related to the accounting review and restatement
Impairment of goodwill
Total operating expenses		(2,398)		(1,797)
Operating (loss) income		3,363		3,152
Other income and (expense)		16		49
Loss before income taxes		3,379		3,201
Income tax expense		(588)		(1,811)
Net loss from continuing operations		$ 2,791		$ 1,390