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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017	Aug. 31, 2017	Aug. 31, 2016
Concentration Risk [Line Items]
Cash and cash equivalents	$ 3,857	$ 4,068	$ 3,857	$ 4,068	$ 3,582	$ 6,030
Net revenues | Customer concentration
Concentration Risk [Line Items]
Concentration risk (as a percent)	73.00%	68.00%	64.00%	63.00%
Net revenues | Geographic concentration
Concentration Risk [Line Items]
Concentration risk (as a percent)	51.00%	71.00%	59.00%	74.00%
United States | U.S. Dollars
Concentration Risk [Line Items]
Cash and cash equivalents	$ 317		$ 317		109
Taiwan | U.S. Dollars
Concentration Risk [Line Items]
Cash and cash equivalents	2,693		2,693		2,350
Taiwan | New Taiwan Dollars
Concentration Risk [Line Items]
Cash and cash equivalents	48		48		81
Taiwan | Other currencies
Concentration Risk [Line Items]
Cash and cash equivalents	743		743		646
China (including Hong Kong) | U.S. Dollars
Concentration Risk [Line Items]
Cash and cash equivalents	7		7		7
China (including Hong Kong) | Renminbi
Concentration Risk [Line Items]
Cash and cash equivalents	43		43		$ 389
China (including Hong Kong) | H.K. dollars
Concentration Risk [Line Items]
Cash and cash equivalents	$ 6		$ 6

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 45
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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