Stock-Based Compensation (Details) - 2004 Stock Incentive Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Stock-based compensation expense
Allocated Share-based Compensation Expense	$ 2,605	$ 1,871	$ 1,407
Income tax expense	0	0
Total stock-based compensation expense after taxes	2,605	1,871	1,407
Cost of Revenue [Member]
Stock-based compensation expense
Allocated Share-based Compensation Expense	89	53	27
Selling and Marketing Expense [Member]
Stock-based compensation expense
Allocated Share-based Compensation Expense	170	337	190
Research and Development Expense [Member]
Stock-based compensation expense
Allocated Share-based Compensation Expense	452	338	115
General and Administrative Expense [Member]
Stock-based compensation expense
Allocated Share-based Compensation Expense	$ 1,894	$ 1,143	$ 1,075