Share Based Payments Summary of Stock Options Outstanding and Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Feb. 28, 2015
Options
Outstanding, beginning of period (in shares)	6,984,605
Granted (in shares)	571,219
Exercised (in shares)	794,768	[1]
Forfeited (in shares)	40,000
Expired (in shares)	996,610
Outstanding, end of period (in shares)	5,724,446
Exercisable, end of period (in shares)	2,557,363
Price
Outstanding, beginning of period (in dollars per share)	$ 3.74
Granted (in dollars per share)	$ 2.90
Exercised (in dollars per share)	$ 0.57	[1]
Forfeited (in dollars per share)	$ 0.70
Expired or exchanged (in dollars per share)	$ 17.28
Outstanding, end of period (in dollars per share)	$ 1.76
Exercisable, end of period (in dollars per share)	$ 2.00
Weighted Average Remaining Contractual Term, Outstanding	6 years 7 months 0 days
Weighted Average Remaining Contractual Term, Exercisable, end of period	5 years 2 months 0 days
Aggregate Intrinsic Value, Outstanding, end of period	$ 5,060
Aggregate Intrinsic Value, Exercisable, end of period	$ 2,447

[1] The Company did not record an income tax benefit related to option exercises in the years ended February 28, 2013, 2014 and 2015. Cash received from option exercises during the years ended February 2013, 2014 and 2015 was $0.3 million, $0.3 million and $0.4 million, respectively.