Quarterly Consolidated Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2015	Feb. 28, 2014
Selected Quarterly Financial Data [Line Items]
Net sales	$ 2,974	$ 3,557	$ 2,592	$ 3,695	$ 3,904	$ 3,721	$ 2,585	$ 4,201	$ 12,818	$ 14,411
Gross profit	(280)	674	14	977	(1,706)	226	224	178	1,385	(1,078)
Net income (loss)	$ (3,445)	$ (2,836)	$ 149	$ 139	$ (3,554)	$ (651)	$ (804)	$ (451)	$ (5,993)	$ (2,681)
Basic net income (loss) per share	$ (0.54)	$ (0.45)	$ 0.02	$ 0.02	$ (0.47)	$ (0.09)	$ (0.11)	$ (0.06)	$ (0.95)	$ (0.72)
Diluted net income (loss) per share	$ (0.54)	$ (0.45)	$ 0.02	$ 0.02	$ (0.47)	$ (0.09)	$ (0.11)	$ (0.06)	$ (0.94)	$ (0.35)