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Common and Convertible Preferred Stock and Equity (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 0 Months Ended |  |  |  | 0 Months Ended | 1 Months Ended |  |  |  |
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Dec. 08, 2010 | Aug. 31, 2012 | Aug. 31, 2011 | Nov. 13, 2010 | Dec. 08, 2010 Common Stock | Dec. 31, 2010 Common Stock | Aug. 31, 2012 Common Stock | Aug. 31, 2011 Common Stock | Dec. 08, 2011 Class A | Dec. 08, 2010 Convertible preferred stock
Common and Convertible Preferred Stock and Equity |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio of the common and convertible preferred stock |  |  |  | 14 |  |  |  |  |  |
Common and convertible preferred stock and equity |  |  |  |  |  |  |  |  |  |
Conversion Ratio |  |  |  |  |  |  |  |  | 1 |
Issuance of stock (in shares) |  |  |  |  | 5,250 |  |  |  |  |
Offering price (in dollars per share) |  |  |  |  | $ 17.00 |  |  |  |  |
Purchase of shares by underwriters (in shares) |  |  |  |  |  | 788 |  |  |  |
Net proceeds from the initial public offering |  |  |  |  |  | $ 95.5 |  |  |  |
Common stock, offering-related expenses |  |  |  |  |  | $ 3.5 |  |  |  |
Class B common stock shares converted to common stock |  |  |  |  |  | 661 |  |  |  |
Common stock, shares authorized |  | 32,143 | 32,143 |  |  |  | 32,143 |  |  |
Common stock, par value (in dollars per share) |  | $ 0.0000056 | $ 0.0000056 |  |  |  | $ 0.0000056 |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  | 2,945 | 3,153 |  |
Convertible preferred stock, shares issued |  |  |  |  |  |  |  |  |  | 13,719
Ratio of conversion of convertible preferred stock into common stock | 1 |  |  |  |  |  |  |  |  |
Common stock issued as a result of conversion of convertible preferred stock (in shares) | 13,719 |  |  |  |  |  |  |  |  |

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