Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Revenue:
Product revenue	$ 42,609	$ 38,647
Funded research and development	61	136
Total Revenue	42,670	38,783
Costs and expenses:
Cost of product revenue	8,723	7,446
Research and development	7,287	6,712
Selling, general and administrative	27,967	20,953
Amortization of intangible assets		111
Costs and Expenses, Total	43,977	35,222
(Loss) income from operations	(1,307)	3,561
Other expense:
Investment income (expense), net	16	(2)
Other expense, net	(21)	(4)
Nonoperating Income (Expense), Total	(5)	(6)
(Loss) income before income tax provision	(1,312)	3,555
Income tax provision	411	436
Net (loss) income	$ (1,723)	$ 3,119
Basic net (loss) income per share	$ (0.04)	$ 0.08
Basic weighted average shares outstanding	38,678	39,144
Diluted net (loss) income per share	$ (0.04)	$ 0.08
Diluted weighted average shares outstanding	38,678	41,549