Stock-based Compensation (Details 2) (Stock options, USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Stock options
Weighted-average assumptions for grants of stock options
Dividend rate (as a percent)	0.00%
Risk-free interest rate (as a percent)	0.90%
Expected term (in years)	6 years 3 months 18 days
Expected volatility (as a percent)	54.50%
Number of Stock Options Outstanding
Outstanding at the beginning of the period (in shares)	576	775
Granted (in shares)	100
Forfeited (in shares)	(150)	(118)
Exercised (in shares)	(85)	(81)
Outstanding at the end of the period (in shares)	441	576	775
Vested and expected to vest at the end of the period (in shares)	408
Exercisable at the end of the period (in shares)	238
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 8.54	$ 8.20
Granted (in dollars per share)	$ 1.72
Forfeited (in dollars per share)	$ 7.69	$ 11.64
Exercised (in dollars per share)	$ 0.87	$ 0.86
Outstanding at the end of the period (in dollars per share)	$ 8.76	$ 8.54	$ 8.20
Vested and expected to vest at the end of the period (in dollars per share)	$ 8.89
Exercisable at the end of the period (in dollars per share)	$ 8.34
Weighted-Average Remaining Contractual Life
Outstanding at the beginning of the period	7 years 2 months 12 days	7 years 7 months 6 days	8 years 6 months
Outstanding at the end of the period	7 years 2 months 12 days	7 years 7 months 6 days	8 years 6 months
Vested and expected to vest at the end of the period	7 years 1 month 6 days
Exercisable at the end of the period	6 years 4 months 24 days
Aggregate Intrinsic Value
Outstanding at the beginning of the period	$ 263,000	$ 1,456,000
Outstanding at the end of the period	9,000	263,000	1,456,000
Vested and expected to vest at the end of the period	9,000
Exercisable at the end of the period	9,000
Additional information on stock options
Aggregate intrinsic value of options exercised	400,000	300,000
Unrecognized compensation cost related to unvested stock options	$ 700,000	$ 1,300,000
Weighted-average remaining period over which expense will be recognized	1 year 6 months	2 years 3 months 18 days