CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements Of Income
Service revenue	$ 98,212	$ 78,382	$ 64,998
Product revenue	9,402	7,421	5,165
Total revenue	107,614	85,803	70,163
Operating expenses:
Cost of service revenue	22,201	18,065	14,508
Cost of product revenue	11,801	9,822	8,115
Research and development	8,147	6,745	4,819
Sales and marketing	46,244	37,980	31,744
General and administrative	8,619	6,012	4,733
Gain on patent sale	(12,965)	0	0
Total operating expenses	84,047	78,624	63,919
Income from operations	23,567	7,179	6,244
Other income (loss), net	105	(305)	138
Income on change in fair value of warrant liability	0	0	167
Income before provision (benefit) for income taxes	23,672	6,874	6,549
Provision (benefit) for income taxes	9,733	(62,354)	55
Net income	$ 13,939	$ 69,228	$ 6,494
Net income per share:
Basic	$ 0.20	$ 1.04	$ 0.10
Diluted	$ 0.19	$ 0.99	$ 0.10
Weighted average number of shares:
Basic	71,390	66,413	63,087
Diluted	74,700	70,149	65,873