Consolidated Statements of Operations and Comprehensive Income (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Product revenue	$ 61,956,386	$ 52,735,730	$ 37,320,906
Licensing, milestone and contract revenue	2,822,249	2,820,864	2,814,798
Total revenue	64,778,635	55,556,594	40,135,704
Operating expenses:
Cost of product revenue	26,783,738	23,826,604	13,670,228
Research & development	6,168,937	6,874,633	8,181,532
Selling, general & administrative	17,858,558	17,317,671	10,545,351
Acquisition-related expenses			2,151,854
Total operating expenses	50,811,233	48,018,908	34,548,965
Income from operations	13,967,402	7,537,686	5,586,739
Interest income (expense), net	(182,388)	(194,620)	(74,480)
Income before income taxes	13,785,014	7,343,066	5,512,259
Provision for income taxes	5,318,334	3,027,071	1,824,692
Net income	8,466,680	4,315,995	3,687,567
Basic net income per share:
Net income	$ 0.65	$ 0.34	$ 0.32
Basic weighted average common shares outstanding	13,064,051	12,624,495	11,386,989
Diluted net income per share:
Net income	$ 0.62	$ 0.32	$ 0.32
Diluted weighted average common shares outstanding	13,747,813	13,646,533	11,562,304
Net income	8,466,680	4,315,995	3,687,567
Other comprehensive income (loss)
Foreign currency translation adjustment	(519,405)	(2,547,776)
Comprehensive income	$ 7,947,275	$ 1,768,219	$ 3,687,567