Stock-based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified		6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		1 Months Ended
	Aug. 31, 2010 item	Feb. 28, 2013 Stock options	Feb. 28, 2013 Employees, directors and consultants	Feb. 29, 2012 Employees, directors and consultants	Feb. 28, 2013 Employees, directors and consultants	Feb. 29, 2012 Employees, directors and consultants	Feb. 28, 2013 Employees, directors and consultants Cost of revenues	Feb. 29, 2012 Employees, directors and consultants Cost of revenues	Feb. 28, 2013 Employees, directors and consultants Cost of revenues	Feb. 29, 2012 Employees, directors and consultants Cost of revenues	Feb. 28, 2013 Employees, directors and consultants Research and development	Feb. 29, 2012 Employees, directors and consultants Research and development	Feb. 28, 2013 Employees, directors and consultants Research and development	Feb. 29, 2012 Employees, directors and consultants Research and development	Feb. 28, 2013 Employees, directors and consultants Selling, general and administrative	Feb. 29, 2012 Employees, directors and consultants Selling, general and administrative	Feb. 28, 2013 Employees, directors and consultants Selling, general and administrative	Feb. 29, 2012 Employees, directors and consultants Selling, general and administrative	Sep. 30, 2012 Executive officer Stock options	Feb. 28, 2013 Directors Restricted stock unit
Stock-based Compensation
Number of share-based compensation plans	1
Stock-based Compensation
Stock-based compensation expense			$ 641	$ 965	$ 977	$ 1,616	$ 259	$ 422	$ 442	$ 592	$ 137	$ 145	$ 231	$ 194	$ 245	$ 398	$ 304	$ 830
Options granted of common stock (in shares)																			100
Exercise price (in dollars per share)																			$ 1.72
Vesting period		1 year																	4 years
Vesting percentage on each anniversary of the vesting start date of awards granted																			25.00%
Contractual term																			10 years
Stock units granted (in shares)																				211
Vesting percentage on the earlier of the first anniversary of the vesting start date and the date of the next annual meeting																				100.00%
Grant-date fair value (in dollars per share)																				$ 0.71
Estimated forfeiture rate (as a percent)		0.00%