Summary of Stock Options Outstanding and Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	May 31, 2013
Options
Outstanding, beginning of period	7,132,459
Granted	330,000
Exercised	86,250	[1]
Forfeited
Expired	549,926
Outstanding, end of period	6,826,283
Exercisable, end of period	3,728,179
Price
Outstanding, beginning of period	$ 4.31
Granted	$ 1.64
Exercised	$ 0.65	[1]
Forfeited
Expired or exchanged	$ 11.08
Outstanding, end of period	$ 3.68
Exercisable, end of period	$ 5.94
Outstanding	6 years 7 months 6 days
Exercisable, end of period	4 years 8 months 12 days
Outstanding, end of period	$ 4,255
Exercisable, end of period	$ 2,000

[1] The Company did not record an income tax benefit related to option exercises in the three months ended May 31, 2012 and 2013.