CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Condensed Consolidated Statements Of Income
Service revenue	$ 21,200	$ 16,664	$ 56,234	$ 48,098
Product revenue	2,078	1,114	5,370	3,881
Total revenue	23,278	17,778	61,604	51,979
Operating expenses:
Cost of service revenue	4,890	3,819	12,764	10,790
Cost of product revenue	2,584	1,840	7,467	5,897
Research and development	1,955	1,131	4,902	3,628
Selling, general and administrative	11,297	9,570	31,448	27,453
Total operating expenses	20,726	16,360	56,581	47,768
Income from operations	2,552	1,418	5,023	4,211
Other income, net	49	78	58	112
Income on change in fair value of warrant liability	0	0	0	167
Income before provision (benefit) for income taxes	2,601	1,496	5,081	4,490
Provision (benefit) for income taxes	15	0	(284)	7
Net income	$ 2,586	$ 1,496	$ 5,365	$ 4,483
Net income per share:
Basic	$ 0.04	$ 0.02	$ 0.08	$ 0.07
Diluted	$ 0.04	$ 0.02	$ 0.08	$ 0.07
Weighted average number of shares:
Basic	69,445	63,281	65,165	63,365
Diluted	73,214	66,873	69,013	65,622