Share Based Payments Summary of Nonvested Options and Changes (Detail)	12 Months Ended
	Feb. 29, 2016 $ / shares shares
Options
Nonvested, beginning of period (in shares) | shares	3,167,083
Granted (in shares) | shares	2,478,719
Vested (in shares) | shares	2,187,549
Forfeited (in shares) | shares	135,000
Nonvested, end of period (in shares) | shares	3,323,253
Weighted Average Grant Date Fair Value
Nonvested, beginning of period (in dollars per share) | $ / shares	$ 1.08
Granted (in dollars per share) | $ / shares	0.75
Vested (in dollars per share) | $ / shares	0.93
Forfeited (in dollars per share) | $ / shares	1.22
Nonvested, end of period (in dollars per share) | $ / shares	$ 0.93