CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Condensed Consolidated Statements Of Income
Service revenue	$ 24,958	$ 21,200	$ 72,307	$ 56,234
Product revenue	2,382	2,078	6,656	5,370
Total revenue	27,340	23,278	78,963	61,604
Operating expenses:
Cost of service revenue	5,473	4,890	16,984	12,764
Cost of product revenue	3,203	2,584	8,585	7,467
Research and development	2,117	1,955	5,973	4,902
Sales and marketing	11,651	9,816	33,202	27,076
General and administrative	2,136	1,481	6,270	4,372
Gain on patent sale	0	0	(11,965)	0
Total operating expenses	24,580	20,726	59,049	56,581
Income from operations	2,760	2,552	19,914	5,023
Other income, net	73	49	90	58
Income before provision (benefit) for income taxes	2,833	2,601	20,004	5,081
Provision (benefit) for income taxes	913	15	7,726	(284)
Net income	$ 1,920	$ 2,586	$ 12,278	$ 5,365
Net income per share:
Basic	$ 0.03	$ 0.04	$ 0.17	$ 0.08
Diluted	$ 0.03	$ 0.04	$ 0.16	$ 0.08
Weighted average number of shares:
Basic	71,611	69,445	71,197	65,165
Diluted	74,988	73,214	74,483	69,013