Stock Option Plan and Stock Based Compensation - Summary of Unvested Stock Options (Detail) (USD $)	3 Months Ended
May 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Unvested Beginning Balance, Number of Options	169,954
New grants, Number of Options	36,155
Vested, Number of Options	(93,898)
Forfeited, Number of Options
Unvested Ending Balance, Number of Options	112,211
Unvested Beginning Balance, Weighted Average Grant Date Fair Value	$ 3.20
New grants, Weighted Average Grant Date Fair Value	$ 1.96
Vested, Weighted Average Grant Date Fair Value	$ 3.08
Forfeited, Weighted Average Grant Date Fair Value
Unvested Ending Balance, Weighted Average Grant Date Fair Value	$ 2.89

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Share based payment award equity instruments options forfeited in period weighted average grant date fair value.

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Share based compensation arrangement by share based payment award equity instruments options nonvested weighted average grant date fair values.

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Gross number of share options (or share units) granted during the period.

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options outstanding.

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Number of options vested.

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Weighted average grant-date fair value of options vested.

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