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Stock Option Plan and Stock Based Compensation - Summary of Unvested Stock Options (Detail) - $ / shares	9 Months Ended
	Nov. 30, 2017	Nov. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Unvested Beginning Balance, Number of Options	5,073
New grants, Number of Options	0	0
Vested, Number of Options	(3,457)
Forfeited, Number of Options	0
Unvested Ending Balance, Number of Options	1,616
Unvested Beginning Balance, Weighted Average Grant Date Fair Value	$ 2.41
New grants, Weighted Average Grant Date Fair Value	0
Vested, Weighted Average Grant Date Fair Value	2.48
Forfeited, Weighted Average Grant Date Fair Value	0
Unvested Ending Balance, Weighted Average Grant Date Fair Value	$ 2.24

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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

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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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