Share Based Payments Summary of Nonvested Options and Changes (Detail) (USD $)	9 Months Ended
	Nov. 30, 2013
Options
Nonvested, beginning of period	3,188,104
Granted	636,219
Vested	701,714
Forfeited	27,500
Nonvested, end of period	3,095,109
Weighted Average Grant Date Fair Value
Nonvested, beginning of period	$ 0.76
Granted	$ 1.66
Vested	$ 0.86
Forfeited	$ 0.57
Nonvested, end of period	$ 0.92