Product and Geographic Information - Revenues by Products (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2016	Aug. 31, 2015
Revenues by products
Revenues	$ 1,883	$ 2,378	$ 2,916	$ 2,963	$ 3,122	$ 3,508	$ 4,566	$ 2,928	$ 10,140	$ 14,124
LED chips
Revenues by products
Revenues									797	2,406
LED components
Revenues by products
Revenues									7,716	9,126
Lighting products
Revenues by products
Revenues									1,466	2,020
Other
Revenues by products
Revenues									$ 161	$ 572