Quarterly Consolidated Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 29, 2016	Feb. 28, 2015
Selected Quarterly Financial Data [Line Items]
Net sales	$ 3,952	$ 2,387	$ 2,923	$ 2,360	$ 2,974	$ 3,557	$ 2,592	$ 3,695	$ 11,622	$ 12,818
Gross profit (loss)	708	(422)	250	64	(280)	674	14	977	580	1,385
Net income (loss)	$ (1,072)	$ (2,139)	$ (1,366)	$ (1,569)	$ (3,445)	$ (2,836)	$ 149	$ 139	$ (6,146)	$ (5,993)
Basic net income (loss) per share	$ (0.19)	$ (0.36)	$ (0.23)	$ (0.26)	$ (0.54)	$ (0.45)	$ 0.02	$ 0.02	$ (1.13)	$ (0.95)
Diluted net income (loss) per share	$ (0.19)	$ (0.36)	$ (0.23)	$ (0.26)	$ (0.54)	$ (0.45)	$ 0.02	$ 0.02	$ (1.04)	$ (0.94)