Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Costs and expenses:
Total share-based compensation	$ 684	$ 790
Income tax benefit	(200)	(300)
Cost of revenue [Member]
Costs and expenses:
Total share-based compensation	97	86
Research and development costs [Member]
Costs and expenses:
Total share-based compensation	110	83
Selling, general and administrative [Member]
Costs and expenses:
Total share-based compensation	$ 477	$ 621