Stock-based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended										1 Months Ended	12 Months Ended	1 Months Ended		12 Months Ended		1 Months Ended
	Aug. 31, 2013 item	Aug. 31, 2012	Aug. 31, 2013 Employees, directors and nonemployees Cost of revenues	Aug. 31, 2012 Employees, directors and nonemployees Cost of revenues	Aug. 31, 2013 Employees, directors and nonemployees Research and development	Aug. 31, 2012 Employees, directors and nonemployees Research and development	Aug. 31, 2013 Employees, directors and nonemployees Selling, general and administrative	Aug. 31, 2012 Employees, directors and nonemployees Selling, general and administrative	Aug. 31, 2013 Restricted stock unit	Aug. 31, 2012 Restricted stock unit	Apr. 30, 2013 Restricted stock unit Executives and employees	Aug. 31, 2012 Restricted stock unit Executives and employees	Feb. 28, 2013 Restricted stock unit Directors	Feb. 29, 2012 Restricted stock unit Directors	Aug. 31, 2013 Stock options	Aug. 31, 2013 Stock options Less than or equal to	Sep. 30, 2012 Stock options Executive officer	Aug. 31, 2013 Common Stock	Aug. 31, 2012 Common Stock
Stock-based Compensation
Number of share-based compensation plans	1
Stock-based Compensation
Stock-based compensation expense	$ 2,020	$ 2,616	$ 838	$ 952	$ 429	$ 366	$ 753	$ 1,298
Shares of common stock reserved for issuance	3,849,000
Common stock reserved for issuance (in shares)																		2,654,000	2,945,000
Options granted of common stock (in shares)												829,000		31,000	100,000		100,000
Exercise price (in dollars per share)															$ 1.72		$ 1.72
Vesting period											4 years	4 years				1 year	4 years
Vesting percentage on each anniversary of the vesting start date of awards granted											25.00%	25.00%					25.00%
Contractual term																	10 years
Stock units granted (in shares)									1,406,000	860,000	1,195,000		211,000
Vesting percentage on the earlier of the first anniversary of the vesting start date and the date of the next annual meeting													100.00%	100.00%
Grant-date fair value (in dollars per share)									$ 1.24	$ 3.46	$ 1.33		$ 0.71	$ 3.27
Number of shares of common stock for which contingent right is established by restricted stock unit (in shares)														1
Estimated forfeiture rate (as a percent)															0.00%
Stock-based compensation tax benefit recognized	$ 0	$ 0