CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Revenue:
Product revenue	$ 46,141	$ 38,112	$ 133,038	$ 114,078
Funded research and development	54	138	172	372
Total Revenue	46,195	38,250	133,210	114,450
Costs and expenses:
Cost of product revenue	9,458	8,130	27,208	22,770
Research and development	7,779	6,259	22,787	18,825
Selling, general and administrative	24,364	20,943	78,530	60,333
Amortization of intangible assets				111
Costs and Expenses, Total	41,601	35,332	128,525	102,039
Income from operations	4,594	2,918	4,685	12,411
Other income:
Investment income, net	37	1	78
Other income, net	20	324	5	311
Nonoperating Income (Expense), Total	57	325	83	311
Income before income tax provision	4,651	3,243	4,768	12,722
Income tax provision	258	559	1,039	1,450
Net income	$ 4,393	$ 2,684	$ 3,729	$ 11,272
Basic net income per share	$ 0.11	$ 0.07	$ 0.10	$ 0.29
Basic weighted average shares outstanding	39,592	39,417	39,179	39,331
Diluted net income per share	$ 0.11	$ 0.07	$ 0.09	$ 0.27
Diluted weighted average shares outstanding	41,726	40,865	41,315	41,418