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Stock-based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
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Dec. 08, 2010 | Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2010 item | Aug. 31, 2012 Less than | Aug. 31, 2012 Restricted stock unit | Aug. 31, 2011 Restricted stock unit | Aug. 31, 2011 Stock options | Aug. 31, 2010 Stock options | Aug. 31, 2012 Employees | Aug. 31, 2011 Employees | Aug. 31, 2010 Employees | Aug. 31, 2012 Employees Cost of revenues | Aug. 31, 2011 Employees Cost of revenues | Aug. 31, 2010 Employees Cost of revenues | Aug. 31, 2012 Employees Research and development | Aug. 31, 2011 Employees Research and development | Aug. 31, 2010 Employees Research and development | Aug. 31, 2012 Employees Selling, general and administrative | Aug. 31, 2011 Employees Selling, general and administrative | Aug. 31, 2010 Employees Selling, general and administrative | Aug. 31, 2012 Employees Stock options and stock units | Aug. 31, 2011 Employees Stock options and stock units | Aug. 31, 2010 Employees Stock options and stock units | Jul. 31, 2012 Employees Restricted stock unit | Aug. 31, 2011 Employees Restricted stock unit | Aug. 31, 2011 Employees Stock options | Jan. 20, 2011 Directors Restricted stock unit | Feb. 29, 2012 Directors Restricted stock unit | Aug. 31, 2012 Directors Restricted stock unit | Aug. 31, 2011 Directors Restricted stock unit | Aug. 31, 2012 Nonemployees Stock options | Aug. 31, 2011 Nonemployees Stock options | Aug. 31, 2010 Nonemployees Stock options | Aug. 31, 2012 Other | Aug. 31, 2011 Other | Aug. 31, 2010 Other | Feb. 29, 2012 Executives and employees Restricted stock unit
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share-based compensation plans |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of conversion of convertible preferred stock into common stock | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 2,616 | $ 1,785 | $ 247 |  |  |  |  |  | $ 1,921 | $ 862 | $ 131 | $ 952 | $ 523 | $ 52 | $ 366 | $ 184 | $ 33 | $ 603 | $ 155 | $ 46 | $ 1,921 | $ 862 | $ 131 |  |  |  |  |  | $ 578 | $ 823 | $ 6 | $ (27) | $ 54 | $ 111 | $ 127 | $ 62 |
Shares of common stock reserved for issuance |  | 3,849,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted of common stock (in shares) |  |  |  |  |  |  |  | 453,000 | 138,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 453,000 |  |  |  |  |  |  |  |  |  |  |
Stock units granted (in shares) |  |  |  |  |  | 860,000 | 346,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,000 | 275,000 |  | 71,000 | 31,000 |  |  |  |  |  |  |  |  | 786,000
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  | 4 years |  |  |  |  |  |  |  |  | 4 years |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage on first anniversary of the vesting start date of awards granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |
Grant-date fair value (in dollars per share) |  |  |  |  |  | $ 3.46 | $ 17.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.31 |  |  | $ 19.00 | $ 3.27 |  |  |  |  |  |  |  |  | $ 3.53
Number of shares of common stock for which contingent right is established by restricted stock unit (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Vesting period specified for forfeiture rate |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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