Fair Value Measurements (Details) (Recurring [Member], USD $)	9 Months Ended
	Dec. 31, 2014	Mar. 31, 2014
Assets carried at fair value measured on a recurring basis [Abstract]
Short-term U.S. government and agency debt securities	$ 0	$ 3,451,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets carried at fair value measured on a recurring basis [Abstract]
Short-term U.S. government and agency debt securities	0	0
Significant Other Observable Inputs ( Level 2) [Member]
Assets carried at fair value measured on a recurring basis [Abstract]
Short-term U.S. government and agency debt securities	0	3,451,000
Maximum period for maturity of debt securities	2 years
Significant Unobservable Inputs (Level 3) [Member]
Assets carried at fair value measured on a recurring basis [Abstract]
Short-term U.S. government and agency debt securities	$ 0	$ 0