CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
	Jun. 30, 2011		Jun. 30, 2010
Revenue:
Product revenue	$ 4,358,392		$ 4,268,812
Royalty and other revenue	3,295,333		2,741,060
Total revenue	7,653,725		7,009,872
Operating expenses:
Cost of product revenue	1,552,809	[1]	1,265,750	[1]
Cost of royalty and other revenue	415,870		371,741
Research and development	3,517,461	[1]	2,695,048	[1]
Selling, general and administrative	2,289,118	[1]	1,788,238	[1]
Total operating expenses	7,775,258		6,120,777
(Loss) income from operations	(121,533)		889,095
Investment income	65,936		98,958
(Loss) income before income taxes	(55,597)		988,053
Income tax provision
Net (loss) income	$ (55,597)		$ 988,053
Earnings (loss) per share:
Basic	$ 0.00		$ 0.03
Diluted	$ 0.00		$ 0.03
Weighted average shares outstanding:
Basic	30,812,257		30,767,585
Diluted	30,812,257		30,926,096

[1] Includes non-cash stock-based compensation as follows: Cost of product revenue $ 15,036 $ 15,122 Research and development 72,356 60,821 Selling, general and administrative 194,625 186,940