Balance Sheet Components (Details 2) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Feb. 28, 2013	Aug. 31, 2012
Intangible Assets
Gross Carrying Amount	$ 2,137	$ 2,089
Accumulated Amortization	717	537
Total	1,420	1,552
Patents and trademarks
Intangible Assets
Weighted Average Amortization Period	16 years	17 years
Gross Carrying Amount	620	585
Accumulated Amortization	167	146
Total	453	439
Acquired technology
Intangible Assets
Weighted Average Amortization Period	4 years	4 years
Gross Carrying Amount	168	167
Accumulated Amortization	123	101
Total	45	66
Customer relationships
Intangible Assets
Weighted Average Amortization Period	5 years	5 years
Gross Carrying Amount	1,349	1,337
Accumulated Amortization	427	290
Total	$ 922	$ 1,047