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Stock-based Compensation (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2016 $ / shares shares | May 31, 2015 $ / shares shares | Apr. 30, 2014 shares | Aug. 31, 2016 USD ($) item $ / shares shares | Aug. 31, 2015 USD ($) $ / shares shares
Stock-based Compensation |  |  |  |  |
Number of share-based compensation plans | item |  |  |  | 1 |
Additional number of shares authorized for issuance |  |  | 250,000 |  |
Shares of common stock reserved for issuance |  |  |  | 635,000 | 635,000
Stock-based compensation expense | $ |  |  |  | $ 382 | $ 1,289
Stock-based compensation tax benefit recognized | $ |  |  |  | $ 0 | $ 0
Common Stock |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Common stock available for future issuance (in shares) |  |  |  | 353,000 | 388,000
Restricted stock unit |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Stock units granted (in shares) |  |  |  | 8,000 | 15,000
Stock units vested (in shares) |  |  |  | 35,000 | 62,000
Grant-date fair value (in dollars per share) | $ / shares |  |  |  | $ 3.40 | $ 7.85
Employee Stock Option |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Estimated forfeiture rate (as a percent) |  |  |  | 0.00% |
Employee Stock Option | Maximum |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Vesting period |  |  |  | 1 year |
Employees, directors and nonemployees | Cost of revenues |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Stock-based compensation expense | $ |  |  |  | $ 91 | $ 285
Employees, directors and nonemployees | Research and development |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Stock-based compensation expense | $ |  |  |  | 40 | 149
Employees, directors and nonemployees | Selling, general and administrative |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Stock-based compensation expense | $ |  |  |  | $ 251 | $ 855
Executives and employees | Restricted stock unit |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Stock units granted (in shares) |  |  |  |  | 10,000
Vesting period |  |  |  |  | 4 years
Vesting percentage on each anniversary of the vesting start date of awards granted |  |  |  |  | 25.00%
Directors | Restricted stock unit |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Stock units granted (in shares) | 8,000 | 5,000 |  |  |
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) | $ / shares | $ 3.40 | $ 8.20 |  |  |
Number of shares of common stock for which contingent right is established by restricted stock unit (in shares) |  | 1 |  |  |

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- Definition Represents the number of shares of common stock for which contingent right of acquisition is established by grants made under equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan). + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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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