Stockholder's Equity (Details 2) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stock-based compensation expense
Total stock-based compensation expense	$ 1,049,000	$ 1,280,000	$ 1,007,000
Net stock-based compensation expense	1,049,000	1,280,000	1,007,000
Total unrecognized compensation cost related to non-vested share-based compensation arrangements	1,700,000
Period for recognition of total unrecognized compensation cost	2 years 2 months 12 days
Cost of revenue
Stock-based compensation expense
Total stock-based compensation expense	93,000	152,000	68,000
Selling and marketing
Stock-based compensation expense
Total stock-based compensation expense	210,000	357,000	342,000
Research and development
Stock-based compensation expense
Total stock-based compensation expense	250,000	376,000	308,000
General and administrative
Stock-based compensation expense
Total stock-based compensation expense	$ 496,000	$ 395,000	$ 289,000