Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues
Product revenues	$ 10,413,952	$ 9,273,158	$ 31,014,467	$ 27,655,391
Service revenues	3,446,226	3,749,164	11,188,725	11,512,299
Royalty revenues	31,637,966	1,499,182	36,604,815	4,444,327
Other revenues	555,557	1,250,000	1,666,669	3,750,000
Total revenues	46,053,701	15,771,504	80,474,676	47,362,017
Costs and expenses
Cost of product revenues	4,309,178	3,781,473	12,582,995	10,583,241
Cost of service revenues	1,626,984	1,367,316	5,221,445	4,320,439
Cost of royalty revenues	11,835,934	599,673	13,822,673	1,777,731
Research and development	4,271,366	3,545,622	11,799,590	11,320,691
Selling and marketing	6,616,494	4,663,632	18,425,200	14,408,442
General and administrative	(1,116,714)	4,267,535	6,150,891	11,579,566
Total costs and expenses	27,543,242	18,225,251	68,002,794	53,990,110
Income (loss) from operations	18,510,459	(2,453,747)	12,471,882	(6,628,093)
Interest income	811,904	108,630	1,013,976	309,747
Other (loss) income	(212,212)	390,784	(172,894)	212,922
Income (loss) before income taxes	19,110,151	(1,954,333)	13,312,964	(6,105,424)
Provision for income taxes	3,861,251	69,454	3,956,977	117,456
Net income (loss)	15,248,900	(2,023,787)	9,355,987	(6,222,880)
Net (loss) income per common share [Abstract]
Basic	$ 0.82	$ (0.11)	$ 0.50	$ (0.34)
Diluted	$ 0.81	$ (0.11)	$ 0.49	$ (0.34)
Weighted average number of shares outstanding
Basic	18,700,253	18,561,877	18,688,202	18,539,847
Diluted	18,816,407	18,561,877	18,980,957	18,539,847
Comprehensive income (loss):
Net income (loss)	15,248,900	(2,023,787)	9,355,987	(6,222,880)
Unrealized gain (loss) on marketable securities, net of taxes	30,823	5,256	55,971	(56,657)
Foreign currency translation adjustment	96,548	(122,434)	53,318	(111,586)
Comprehensive income (loss)	$ 15,376,271	$ (2,140,965)	$ 9,465,276	$ (6,391,123)