Share Based Payments Summary of Stock Options Outstanding and Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Feb. 29, 2016 USD ($) $ / shares shares
Options
Outstanding, beginning of period (in shares) | shares	5,724,446
Granted (in shares) | shares	2,478,719
Exercised (in shares) | shares	190,000	[1]
Forfeited (in shares) | shares	135,000
Expired (in shares) | shares	84,463
Outstanding, end of period (in shares) | shares	7,793,702
Exercisable, end of period (in shares) | shares	4,470,449
Price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 1.76
Granted (in dollars per share) | $ / shares	1.48
Exercised (in dollars per share) | $ / shares	0.70	[1]
Forfeited (in dollars per share) | $ / shares	2.29
Expired or exchanged (in dollars per share) | $ / shares	10.87
Outstanding, end of period (in dollars per share) | $ / shares	1.59
Exercisable, end of period (in dollars per share) | $ / shares	$ 1.52
Weighted Average Remaining Contractual Term, Outstanding	6 years 292 days
Weighted Average Remaining Contractual Term, Exercisable, end of period	5 years 2 months
Aggregate Intrinsic Value, Outstanding, end of period | $	$ 104
Aggregate Intrinsic Value, Exercisable, end of period | $	$ 92

[1] The Company did not record an income tax benefit related to option exercises in the years ended February 2014, 2015 and 2016. Cash received from option exercises during the years ended February 2014, 2015 and 2016 was $0.3 million, $0.4 million and $0.1 million, respectively.