Original and Further Restatement of the Consolidated Financial Statements - Effects of Restatements of Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Product sales	$ 88,300	$ 90,241
Marketing service fees	11,714	12,038
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)
Interest expense, net	(468)	(542)
Other (loss) income	(272)	4,764
Total other income (expense)	(740)	4,222
(Loss) income before income taxes	(769)	10,290
Income tax expense	(1,179)	(4,364)
Net (loss) income from continuing operations	(1,948)	5,926
Discontinued operations (Note 15)
Loss from discontinued operations	(794)	(3,960)
Income tax benefit	234	1,481
Net loss from discontinued operations	(560)	(2,479)
Net (loss) income	(2,508)	3,447
Net income (loss) per common share-basic:
Net (loss) income from continuing operations	$ (0.11)	$ 0.30
Net loss from discontinued operations	$ (0.03)	$ (0.12)
Net (loss) income per common share-basic	$ (0.14)	$ 0.18
Net income (loss) per common share-diluted:
Net (loss) income from continuing operations	$ (0.11)	$ 0.30
Net loss from discontinued operations	$ (0.03)	$ (0.12)
Net (loss) income per common share-diluted	$ (0.14)	$ 0.18
Weighted average number of common shares:
Basic	18,197,363	19,431,093
Diluted	18,197,363	19,691,141
Other comprehensive income, before tax:
Unrealized gain (loss) on cross-currency swap, net of tax	103	(318)
Unrealized gain on derivative instrument		(318)
Foreign currency translation adjustment	376	(2,679)
Comprehensive (loss) income	(2,029)	450
Originally Reported [Member]
Product sales	89,684
Marketing service fees	11,658
Net sales	101,342
Cost of sales	22,632
Gross profit	78,710
Operating expenses
Sales and marketing	43,871
General and administrative	17,545
Research and development	5,939
Amortization of intangible assets	584
Costs related to the accounting review and restatement	8,306
Total operating expenses	76,245
Operating (loss) income	2,465
Other income and (expense)
Interest expense, net	(486)
Other (loss) income	(261)
Total other income (expense)	(747)
(Loss) income before income taxes	1,718
Income tax expense	(1,940)
Net (loss) income from continuing operations	(222)
Discontinued operations (Note 15)
Loss from discontinued operations	(794)
Income tax benefit	234
Net loss from discontinued operations	(560)
Net (loss) income	(782)
Net income (loss) per common share-basic:
Net (loss) income from continuing operations	$ (0.01)
Net loss from discontinued operations	$ (0.03)
Net (loss) income per common share-basic	$ (0.04)
Net income (loss) per common share-diluted:
Net (loss) income from continuing operations	$ (0.01)
Net loss from discontinued operations	$ (0.03)
Net (loss) income per common share-diluted	$ (0.04)
Weighted average number of common shares:
Basic	18,197,363
Diluted	18,197,363
Other comprehensive income, before tax:
Unrealized gain (loss) on cross-currency swap, net of tax	103
Foreign currency translation adjustment	439
Comprehensive (loss) income	(240)
Further Restatement Adjustments [Member]
Product sales	(1,384)	(1,095)
Marketing service fees	56	1
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)
Interest expense, net	18	(18)
Other (loss) income	(11)
Total other income (expense)	7	(18)
(Loss) income before income taxes	(2,487)	(2,001)
Income tax expense	761	317
Net (loss) income from continuing operations	(1,726)	(1,684)
Discontinued operations (Note 15)
Loss from discontinued operations		474
Income tax benefit		157
Net loss from discontinued operations		631
Net (loss) income	(1,726)	(1,053)
Net income (loss) per common share-basic:
Net (loss) income from continuing operations	$ (0.10)	$ (0.09)
Net loss from discontinued operations		$ 0.04
Net (loss) income per common share-basic	$ (0.10)	$ (0.05)
Net income (loss) per common share-diluted:
Net (loss) income from continuing operations	$ (0.10)	$ (0.09)
Net loss from discontinued operations		$ 0.04
Net (loss) income per common share-diluted	$ (0.10)	$ (0.05)
Weighted average number of common shares:
Basic
Diluted
Other comprehensive income, before tax:
Unrealized gain (loss) on cross-currency swap, net of tax
Unrealized gain on derivative instrument
Foreign currency translation adjustment	(63)	29
Comprehensive (loss) income	(1,789)	(1,024)
Previously Reported [Member]
Product sales		88,358
Marketing service fees		11,896
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)
Interest expense, net		(560)
Other (loss) income		4,764
Total other income (expense)		4,204
(Loss) income before income taxes		8,228
Income tax expense		(3,320)
Net (loss) income from continuing operations		4,908
Discontinued operations (Note 15)
Loss from discontinued operations		(4,432)
Income tax benefit		1,640
Net loss from discontinued operations		(2,792)
Net (loss) income		2,116
Net income (loss) per common share-basic:
Net (loss) income from continuing operations		$ 0.25
Net loss from discontinued operations		$ (0.14)
Net (loss) income per common share-basic		$ 0.11
Net income (loss) per common share-diluted:
Net (loss) income from continuing operations		$ 0.25
Net loss from discontinued operations		$ (0.14)
Net (loss) income per common share-diluted		$ 0.11
Weighted average number of common shares:
Basic		19,431,093
Diluted		19,691,141
Other comprehensive income, before tax:
Unrealized gain on derivative instrument		(318)
Foreign currency translation adjustment		(2,814)
Comprehensive (loss) income		(1,016)
Restatement Adjustments [Member]
Product sales		2,978
Marketing service fees		141
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
Total operating expenses		(3,862)
Operating (loss) income		4,063
Other income and (expense)
Interest expense, net
Other (loss) income
Total other income (expense)
(Loss) income before income taxes		4,063
Income tax expense		(1,361)
Net (loss) income from continuing operations		2,702
Discontinued operations (Note 15)
Loss from discontinued operations		(2)
Income tax benefit		(316)
Net loss from discontinued operations		(318)
Net (loss) income		2,384
Net income (loss) per common share-basic:
Net (loss) income from continuing operations		$ 0.14
Net loss from discontinued operations		$ (0.02)
Net (loss) income per common share-basic		$ 0.12
Net income (loss) per common share-diluted:
Net (loss) income from continuing operations		$ 0.14
Net loss from discontinued operations		$ (0.02)
Net (loss) income per common share-diluted		$ 0.12
Weighted average number of common shares:
Basic
Diluted
Other comprehensive income, before tax:
Unrealized gain on derivative instrument
Foreign currency translation adjustment		106
Comprehensive (loss) income		2,490
Original Restatement [Member]
Product sales		91,336
Marketing service fees		12,037
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
Total operating expenses		69,669
Operating (loss) income		8,087
Other income and (expense)
Interest expense, net		(560)
Other (loss) income		4,764
Total other income (expense)		4,204
(Loss) income before income taxes		12,291
Income tax expense		(4,681)
Net (loss) income from continuing operations		7,610
Discontinued operations (Note 15)
Loss from discontinued operations		(4,434)
Income tax benefit		1,324
Net loss from discontinued operations		(3,110)
Net (loss) income		4,500
Net income (loss) per common share-basic:
Net (loss) income from continuing operations		$ 0.39
Net loss from discontinued operations		$ (0.16)
Net (loss) income per common share-basic		$ 0.23
Net income (loss) per common share-diluted:
Net (loss) income from continuing operations		$ 0.39
Net loss from discontinued operations		$ (0.16)
Net (loss) income per common share-diluted		$ 0.23
Weighted average number of common shares:
Basic		19,431,093
Diluted		19,691,141
Other comprehensive income, before tax:
Unrealized gain on derivative instrument		(318)
Foreign currency translation adjustment		(2,708)
Comprehensive (loss) income		$ 1,474