Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Product revenue	$ 17,023,346	$ 14,055,440	$ 51,585,242	$ 46,551,045
Licensing, milestone and contract revenue	731,092	711,171	2,244,584	2,200,995
Total revenue	17,754,438	14,766,611	53,829,826	48,752,040
Operating expenses:
Cost of product revenue	5,377,568	7,221,028	16,530,070	21,718,735
Research & development	1,618,012	1,217,086	5,029,974	4,048,359
Selling, general & administrative	3,188,669	3,601,737	10,536,462	11,061,256
Restructuring charges	(196,084)		(442,869)
Total operating expenses	9,988,165	12,039,851	31,653,637	36,828,350
Income from operations	7,766,273	2,726,760	22,176,189	11,923,690
Interest income (expense), net	(32,816)	(45,161)	(108,755)	(145,493)
Income before income taxes	7,733,457	2,681,599	22,067,434	11,778,197
Provision for income taxes	2,776,199	1,036,349	8,147,282	4,483,960
Net income	4,957,258	1,645,250	13,920,152	7,294,237
Basic net income per share:
Net income (in Dollars per share)	$ 0.36	$ 0.12	$ 1.03	$ 0.55
Basic weighted average common shares outstanding (in Shares)	13,682,449	13,287,463	13,534,334	13,237,629
Diluted net income per share:
Net income (in Dollars per share)	$ 0.33	$ 0.11	$ 0.95	$ 0.51
Diluted weighted average common shares outstanding (in Shares)	14,958,965	14,459,154	14,673,879	14,357,791
Net income	4,957,258	1,645,250	13,920,152	7,294,237
Other comprehensive income
Foreign currency translation adjustment	916,474	557,712	507,119	(286,031)
Comprehensive income	$ 5,873,732	$ 2,202,962	$ 14,427,271	$ 7,008,206