CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Revenue:
Product revenue	$ 38,112	$ 31,732	$ 114,078	$ 88,049
Funded research and development	138	466	372	982
Total Revenue	38,250	32,198	114,450	89,031
Costs and expenses:
Cost of product revenue	8,130	6,279	22,770	17,721
Research and development	6,259	6,140	18,825	19,923
Selling, general and administrative	20,943	17,184	60,333	51,683
Amortization of intangible assets		362	111	1,126
Costs and Expenses, Total	35,332	29,965	102,039	90,453
Income (loss) from operations	2,918	2,233	12,411	(1,422)
Other income:
Investment income (expense), net	1	(2)		(4)
Gain on settlement of investment		1,017		1,017
Other income, net	324	39	311	24
Nonoperating Income (Expense), Total	325	1,054	311	1,037
Income (loss) before income tax provision	3,243	3,287	12,722	(385)
Income tax provision	559	366	1,450	687
Net income (loss)	$ 2,684	$ 2,921	$ 11,272	$ (1,072)
Basic net income (loss) per share	$ 0.07	$ 0.08	$ 0.29	$ (0.03)
Basic weighted average shares outstanding	39,417	38,498	39,331	38,221
Diluted net income (loss) per share	$ 0.07	$ 0.07	$ 0.27	$ (0.03)
Diluted weighted average shares outstanding	40,865	40,270	41,418	38,221