CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenue:
Product	$ 29,151	$ 23,058	$ 56,317	$ 44,819
Funded research and development	327	318	516	559
Total Revenue	29,478	23,376	56,833	45,378
Costs and expenses:
Cost of product revenue excluding amortization of intangibles	5,551	5,408	11,442	10,692
Research and development	6,459	6,589	13,783	13,242
Selling, general and administrative	16,323	14,054	34,499	29,807
Amortization of intangible assets	379	372	764	739
Costs and Expenses, Total	28,712	26,423	60,488	54,480
Income (loss) from operations	766	(3,047)	(3,655)	(9,102)
Other income and expense:
Investment (expense) income, net	(6)	(1)	(2)	(3)
Gain on sale of WorldHeart stock		217		456
Other income (expense), net	66	(128)	(15)	(47)
Nonoperating Income (Expense), Total	60	88	(17)	406
Income (loss) before provision for income taxes	826	(2,959)	(3,672)	(8,696)
Provision for income taxes	225	242	321	485
Net income (loss)	$ 601	$ (3,201)	$ (3,993)	$ (9,181)
Basic net income (loss) per share	$ 0.02	$ (0.09)	$ (0.10)	$ (0.25)
Basic weighted average shares outstanding	38,256	37,156	38,081	37,121
Diluted net income (loss) per share	$ 0.02	$ (0.09)	$ (0.10)	$ (0.25)
Diluted weighted average shares outstanding	39,366	37,156	38,081	37,121