Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue:
Product revenue	$ 15,551,077	$ 13,013,610	$ 29,885,764	$ 24,947,879
Royalty and other revenue		4,495,357	1,991,166	9,017,081
Total revenue	15,551,077	17,508,967	31,876,930	33,964,960
Operating expenses:
Cost of product revenue	6,671,581	5,297,809	13,006,645	12,194,417
Cost of royalty revenue		642,736		1,219,593
Research and development	1,430,133	2,306,332	2,631,123	4,489,736
Selling, general and administrative	4,325,834	3,123,940	7,709,444	6,432,039
Contingent consideration - fair value adjustments	17,700	35,387	116,020	(18,587)
Total operating expenses	12,445,248	11,406,204	23,463,232	24,317,198
Income from operations	3,105,829	6,102,763	8,413,698	9,647,762
Investment income	84,920	65,605	186,736	127,124
Interest expense	(12,780)	(12,402)	(26,865)	(25,933)
Other income (expense)	65,280	(122,263)	67,785	(93,182)
Income before income taxes	3,243,249	6,033,703	8,641,354	9,655,771
Income tax provision	417,827	1,494,516	1,538,829	2,778,348
Net income	2,825,422	4,539,187	7,102,525	6,877,423
Earnings per share:
Basic	$ 0.09	$ 0.14	$ 0.22	$ 0.22
Diluted	$ 0.09	$ 0.14	$ 0.22	$ 0.21
Weighted average shares outstanding:
Basic	32,233,694	31,643,695	32,098,269	31,443,264
Diluted	33,076,384	32,317,156	32,963,554	32,115,519
Other comprehensive income:
Unrealized gain (loss) on investments	9,882	(4,638)	12,066	(6,621)
Foreign currency translation (loss)	(1,462,603)	(883,888)	(1,605,757)	(1,140,496)
Comprehensive income	$ 1,372,701	$ 3,650,661	$ 5,508,834	$ 5,730,306