Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Product sales, net	$ 41,973	$ 41,986	$ 37,202	$ 33,168	$ 40,737	$ 33,621	$ 31,551	$ 26,064		$ 154,329	$ 131,973	$ 99,414
Promotion services revenue	890	894	744	400	688	666	962	501		2,928	2,817	27,644
Cost of product sales	5,217	6,853	5,681	4,597	7,425	6,005	5,011	4,561		22,348	23,002	17,668
Net income	$ 12,544	$ 11,979	$ (4,022)	$ 8,962	$ 3,519	$ 7,915	$ 9,640	$ 4,134		$ 29,463	$ 25,208	$ 10,964
Basic net income per share	$ 0.25	$ 0.24	$ (0.08)	$ 0.18	$ 0.07	$ 0.16	$ 0.19	$ 0.08		$ 0.59	$ 0.49	$ 0.20
Diluted net income per share	$ 0.24	$ 0.23	$ (0.08)	$ 0.17	$ 0.07	$ 0.15	$ 0.18	$ 0.08		$ 0.56	$ 0.48	$ 0.20
Upfront payments			$ 5,500		$ 11,000							$ 5,000
SEC settlement expense (Notes 18 and 22)			$ 10,800						$ 2,000	$ 10,826		$ 2,000
SEC settlement loss										12,800
Upfront and regulatory milestone payments	$ 2,000									$ 2,000
Cardiome [Member]
Payment received for repurchased inventory	1,100
Reduction in general and administraive expense	$ 300