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, 2013
Options
Outstanding, beginning of period	7,132,459
Granted	636,219
Exercised	187,000	[1]
Forfeited	27,500
Expired	556,696
Outstanding, end of period	6,997,482
Exercisable, end of period	3,902,373
Price
Outstanding, beginning of period	$ 4.31
Granted	$ 2.32
Exercised	$ 0.70	[1]
Forfeited	$ 0.70
Expired or exchanged	$ 10.97
Outstanding, end of period	$ 3.69
Exercisable, end of period	$ 5.68
Outstanding	6 years 2 months 26 days
Exercisable, end of period	4 years 6 months
Outstanding, end of period	$ 9,402
Exercisable, end of period	$ 4,726

[1] The Company did not record an income tax benefit related to option exercises in the nine months ended November 30, 2012 and 2013.