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Share Based Payments Summary of Nonvested Options and Changes (Detail) (USD $)
6 Months Ended
Aug. 31, 2013
Options  
Nonvested, beginning of period 3,188,104
Granted 381,219
Vested 434,634
Forfeited 15,000
Nonvested, end of period 3,119,689
Weighted Average Grant Date Fair Value  
Nonvested, beginning of period $ 0.76
Granted $ 1.36
Vested $ 0.98
Forfeited $ 0.57
Nonvested, end of period $ 0.80