Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Product sales	$ 341,084	$ 351,525	$ 349,552
Marketing service fees	55,405	50,752	48,059
Net sales	396,489	402,277	397,611
Cost of sales	86,525	98,912	106,912
Gross profit	309,964	303,365	290,699
Operating expenses
Sales and marketing	178,080	166,547	175,468
General and administrative	87,157	79,074	67,517
Research and development	26,389	24,994	26,768
Restatements and related costs	9,083	15,614	12,945
Impairment of goodwill			19,193
Total operating expenses	300,709	286,229	301,891
Operating income (loss)	9,255	17,136	(11,192)
Other income and (expense)
Interest expense, net	(489)	(1,785)	(1,827)
Other (expense) income	(259)	(2,895)	2,416
Total other income (expense)	(748)	(4,680)	589
Income (loss) before income taxes	8,507	12,456	(10,603)
Income tax expense	(10,849)	(16,200)	(7,602)
Net loss from continuing operations	(2,342)	(3,744)	(18,205)
Discontinued operations (Note 14)
Loss from discontinued operations	(1,827)	(7,157)	(15,510)
Income tax benefit	1,360	2,364	4,903
Net loss from discontinued operations	(467)	(4,793)	(10,607)
Net loss	$ (2,809)	$ (8,537)	$ (28,812)
Net loss per common share—basic and diluted:
Net loss from continuing operations	$ (0.12)	$ (0.20)	$ (0.97)
Net loss from discontinued operations	(0.03)	(0.26)	(0.57)
Net loss per common share—basic and diluted	$ (0.15)	$ (0.46)	$ (1.54)
Weighted average number of common shares:
Basic and diluted	18,795,194	18,459,054	18,697,228
Other comprehensive income (loss), before tax:
Currency translation adjustment	$ (3,907)	$ (4,133)	$ (1,708)
Unrealized gain (loss) on derivative instrument	202	307	(443)
Unrealized loss on debt securities	(3,348)
Other comprehensive loss before tax	(7,053)	(3,826)	(2,151)
Income tax related to components of other comprehensive income	(1,203)	59	(164)
Other comprehensive loss, net of tax	(5,850)	(3,885)	(1,987)
Comprehensive loss	$ (8,659)	$ (12,422)	$ (30,799)