CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue:
Product revenue	$ 37,319	$ 29,151	$ 75,966	$ 56,317
Funded research and development	98	327	234	516
Total Revenue	37,417	29,478	76,200	56,833
Costs and expenses:
Cost of product revenue	7,194	5,551	14,640	11,442
Research and development	5,854	6,459	12,566	13,783
Selling, general and administrative	18,437	16,323	39,390	34,499
Amortization of intangible assets		379	111	764
Costs and Expenses, Total	31,485	28,712	66,707	60,488
Income (loss) from operations	5,932	766	9,493	(3,655)
Other (expense) income:
Investment income (expense), net	1	(6)	(1)	(2)
Other (expense) income, net	(9)	66	(13)	(15)
Nonoperating Income (Expense), Total	(8)	60	(14)	(17)
Income (loss) before income tax provision	5,924	826	9,479	(3,672)
Income tax provision	455	225	891	321
Net income (loss)	$ 5,469	$ 601	$ 8,588	$ (3,993)
Basic net income (loss) per share	$ 0.14	$ 0.02	$ 0.22	$ (0.10)
Basic weighted average shares outstanding	39,431	38,256	39,288	38,081
Diluted net income (loss) per share	$ 0.13	$ 0.02	$ 0.21	$ (0.10)
Diluted weighted average shares outstanding	41,722	39,366	41,645	38,081