Stock-Based Compensation - Schedule of Weighted Average Assumptions used in Black-Scholes Valuation Model for Stock Options Granted (Detail)	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected volatility			85.50%	75.10%
Risk-free interest rate			1.90%	1.70%
Expected life (years)	0 years	0 years	5 years 9 months 18 days	5 years 10 months 24 days
Dividend yield	0.00%	0.00%	0.00%	0.00%