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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 6,030 |  |  |  | $ 4,808 |  |  |  | $ 6,030 | $ 4,808 | $ 12,649
Revenues, net | 1,883 | $ 2,378 | $ 2,916 | $ 2,963 | 3,122 | $ 3,508 | $ 4,566 | $ 2,928 | $ 10,140 | $ 14,124 |
Revenues | Customer concentration | Customer A |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 23.00% | 21.00% |
Revenues, net |  |  |  |  |  |  |  |  | $ 2,334 | $ 2,923 |
Revenues | Customer concentration | Customer B |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 11.00% | 5.00% |
Revenues, net |  |  |  |  |  |  |  |  | $ 1,100 | $ 749 |
Revenues | Customer concentration | Customer C |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  | 11.00% |
Revenues, net |  |  |  |  |  |  |  |  |  | $ 1,544 |
Accounts receivable | Customer concentration | Customer A |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 37.00% | 35.00% |
Accounts receivable | Customer concentration | Customer B |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 24.00% | 9.00% |
United States |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | $ 4,157 | $ 5,420 |
United States | U.S. Dollars |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 945 |  |  |  | 887 |  |  |  | 945 | 887 |
Taiwan |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | 1,190 | 3,131 |
Taiwan | U.S. Dollars |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 3,580 |  |  |  | 1,716 |  |  |  | 3,580 | 1,716 |
Taiwan | New Taiwan Dollars |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 738 |  |  |  | 1,067 |  |  |  | 738 | 1,067 |
Taiwan | Other currencies |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 481 |  |  |  | 344 |  |  |  | 481 | 344 |
China (including Hong Kong) | U.S. Dollars |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 8 |  |  |  | 262 |  |  |  | 8 | 262 |
China (including Hong Kong) | Renminbi |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 277 |  |  |  | 531 |  |  |  | 277 | 531 |
China (including Hong Kong) | H.K. dollars |  |  |  |  |  |  |  |  |  |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 1 |  |  |  | $ 1 |  |  |  | $ 1 | $ 1 |

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