Share Based Payments Summary of Stock Options Outstanding and Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	May 31, 2014
Options
Outstanding, beginning of period	6,984,605
Granted	215,000
Exercised	533,044	[1]
Forfeited	10,000
Expired	986,610
Outstanding, end of period	5,669,951
Exercisable, end of period	2,701,971
Price
Outstanding, beginning of period	$ 3.74
Granted	$ 3.24
Exercised	$ 0.52	[1]
Forfeited	$ 0.70
Expired or exchanged	$ 17.45
Outstanding, end of period	$ 1.65
Exercisable, end of period	$ 1.83
Outstanding	7 years 1 month 15 days
Exercisable, end of period	5 years 9 months 23 days
Outstanding, end of period	$ 8,447
Exercisable, end of period	$ 4,356

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