Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Product sales	$ 85,625	$ 76,832
Marketing service fees	13,054	12,930
Net sales	98,679	89,762
Cost of sales	22,136	19,339
Gross profit	76,543	70,423
Operating expenses
Sales and marketing	44,816	44,285
General and administrative	16,718	21,569
Research and development	7,636	5,845
Restatements and related costs	245	5,916
Total operating expenses	69,415	77,615
Operating income (loss)	7,128	(7,192)
Other income and expense
Interest expense, net	(38)	(272)
Other income, net	1,833	691
Total other income (expense)	1,795	419
Income (loss) before income taxes	8,923	(6,773)
Income tax expense	(4,294)	(964)
Net income (loss) from continuing operations	4,629	(7,737)
Discontinued operations (Note 11)
Loss from discontinued operations	(990)	(781)
Income tax benefit	254	139
Net loss from discontinued operations	(736)	(642)
Net income (loss)	$ 3,893	$ (8,379)
Net income (loss) per common share—basic:
Net income (loss) from continuing operations	$ 0.25	$ (0.41)
Net loss from discontinued operations	(0.04)	(0.04)
Net income (loss) per common share—basic:	0.21	(0.45)
Net income (loss) per common share—diluted:
Net income (loss) from continuing operations	0.25	(0.41)
Net loss from discontinued operations	(0.04)	(0.04)
Net income (loss) per common share—diluted:	$ 0.21	$ (0.45)
Weighted average number of common shares:
Basic	18,477,881	18,731,985
Diluted	18,749,401	18,731,985
Other comprehensive income (loss):
Unrealized gain on derivative instruments, net of tax	$ 26	$ 665
Unrealized loss on debt securities, net of tax	(527)
Foreign currency translation adjustment	1,221	(4,860)
Comprehensive income (loss)	$ 4,613	$ (12,574)