Product and Geographic Information - Revenues by Geography (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 geographic area
Revenues	$ 1,883	$ 2,378	$ 2,916	$ 2,963	$ 3,122	$ 3,508	$ 4,566	$ 2,928	$ 10,140	$ 14,124
Maximum percentage of total net revenues	5.00%								5.00%
United States
Revenues by geographic area
Revenues									$ 4,157	5,420
China
Revenues by geographic area
Revenues									1,375	1,418
Hong Kong
Revenues by geographic area
Revenues									1,287	80
Taiwan
Revenues by geographic area
Revenues									1,190	3,131
Netherlands
Revenues by geographic area
Revenues									706	232
Germany
Revenues by geographic area
Revenues									523	640
Mexico
Revenues by geographic area
Revenues									2	1,544
Other (individually less than 5% of total net revenues)
Revenues by geographic area
Revenues									$ 900	$ 1,659