Share Based Payments Summary of Stock Options Outstanding and Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Nov. 30, 2014
Options
Outstanding, beginning of period	6,984,605
Granted	571,219
Exercised	737,706	[1]
Forfeited	25,000
Expired	986,610
Outstanding, end of period	5,806,508
Exercisable, end of period	2,551,090
Price
Outstanding, beginning of period	$ 3.74
Granted	$ 2.90
Exercised	$ 0.56	[1]
Forfeited	$ 0.70
Expired or exchanged	$ 17.45
Outstanding, end of period	$ 1.75
Exercisable, end of period	$ 1.92
Outstanding	6 years 9 months 15 days
Exercisable, end of period	5 years 3 months 5 days
Outstanding, end of period	$ 4,839
Exercisable, end of period	$ 2,371

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