CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements Of Income
Service revenue	$ 24,177	$ 18,013	$ 47,349	$ 35,034
Product revenue	2,194	1,806	4,274	3,292
Total revenue	26,371	19,819	51,623	38,326
Operating expenses:
Cost of service revenue	5,825	4,059	11,511	7,874
Cost of product revenue	2,672	2,613	5,382	4,883
Research and development	2,030	1,540	3,856	2,947
Sales and marketing	11,010	9,076	21,551	17,260
General and administrative	2,070	1,666	4,134	2,891
Gain on patent sale	0	0	(11,965)	0
Total operating expenses	23,607	18,954	34,469	35,855
Income from operations	2,764	865	17,154	2,471
Other income (expense), net	9	(11)	17	9
Income before provision (benefit) for income taxes	2,773	854	17,171	2,480
Provision (benefit) for income taxes	1,032	22	6,813	(299)
Net income	$ 1,741	$ 832	$ 10,358	$ 2,779
Net income per share:
Basic	$ 0.02	$ 0.01	$ 0.15	$ 0.04
Diluted	$ 0.02	$ 0.01	$ 0.14	$ 0.04
Weighted average number of shares:
Basic	71,261	63,710	70,989	62,989
Diluted	74,558	67,759	74,210	66,833