Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net revenues:
Product sales, net	$ 154,329	$ 131,973	$ 99,414
Promotion services	2,928	2,817	27,644
Total net revenues	157,257	134,790	127,058
Operating expenses:
Cost of product sales	22,348	23,002	17,668
Sales and marketing	53,961	48,477	55,240
Research and development	12,314	14,581	8,044
General and administrative	27,897	22,746	32,496
Restructuring charges			1,181
SEC settlement expense (Notes 18 and 22)	10,826		2,000
Total operating expenses	127,346	108,806	116,629
Income from operations	29,911	25,984	10,429
Non-operating income (expense):
Interest and investment income	869	161	85
Interest and investment expense		(48)	(103)
Other (expense) income, net	(510)	280	2,795
Income before provision for income tax	30,270	26,377	13,206
Provision for income tax	807	1,169	2,242
Net income	$ 29,463	$ 25,208	$ 10,964
Basic net income per share	$ 0.59	$ 0.49	$ 0.20
Diluted net income per share	$ 0.56	$ 0.48	$ 0.20
Weighted average shares used in computing:
Basic net income per share	49,797	51,277	53,587
Diluted net income per share	52,173	52,684	54,936