Stock Option Plan and Stock Based Compensation - Summary of Unvested Stock Options (Detail) - $ / shares	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Unvested Beginning Balance, Number of Options	5,073
New grants, Number of Options	0	0	43,426
Vested, Number of Options	(3,457)
Forfeited, Number of Options	0
Unvested Ending Balance, Number of Options	1,616	5,073
Unvested Beginning Balance, Weighted Average Grant Date Fair Value	$ 2.41
New grants, Weighted Average Grant Date Fair Value	0		$ 2.24
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	$ 2.41