CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue:
Product revenue	$ 51,774	$ 44,288	$ 100,434	$ 86,897
Funded research and development	164	57	315	118
Total Revenue	51,938	44,345	100,749	87,015
Costs and expenses:
Cost of product revenue	9,612	9,027	19,301	17,750
Research and development	8,693	7,721	17,755	15,008
Selling, general and administrative	29,455	26,199	61,053	54,166
Costs and Expenses, Total	47,760	42,947	98,109	86,924
Income from operations	4,178	1,398	2,640	91
Other income (loss):
Investment income, net	36	25	80	41
Other (loss) income, net	(39)	6	(28)	(15)
Nonoperating Income (Expense), Total	(3)	31	52	26
Income before income tax provision	4,175	1,429	2,692	117
Income tax provision	336	370	562	781
Net income (loss)	$ 3,839	$ 1,059	$ 2,130	$ (664)
Basic net income (loss) per share	$ 0.09	$ 0.03	$ 0.05	$ (0.02)
Basic weighted average shares outstanding	40,448	39,260	40,256	38,971
Diluted net income (loss) per share	$ 0.09	$ 0.03	$ 0.05	$ (0.02)
Diluted weighted average shares outstanding	42,239	41,337	42,069	38,971