Quarterly Consolidated Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 28, 2018	Feb. 28, 2017
Selected Quarterly Financial Data [Line Items]
Net sales	$ 3,220	$ 1,666	$ 3,161	$ 3,897	$ 6,998	$ 5,299	$ 3,632	$ 3,710	$ 11,944	$ 19,639
Gross profit (loss)	(341)	(144)	478	597	835	898	590	416	590	2,739
Net income (loss)	$ (1,248)	$ (1,203)	$ (221)	$ (266)	$ (192)	$ (45)	$ (378)	$ (391)	$ (2,938)	$ (1,006)
Basic net income (loss) per share	$ (0.21)	$ (0.20)	$ (0.04)	$ (0.05)	$ (0.03)	$ (0.01)	$ (0.06)	$ (0.07)	$ (0.50)	$ (0.17)
Diluted net income (loss) per share	$ (0.21)	$ (0.20)	$ (0.04)	$ (0.05)	$ (0.03)	$ (0.01)	$ (0.06)	$ (0.07)	$ (0.50)	$ (0.17)