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Convertible Notes - Additional Information (Details) - USD ($)				3 Months Ended		6 Months Ended
	Feb. 18, 2018	Feb. 17, 2018	Mar. 14, 2016	Mar. 31, 2018	Mar. 31, 2017	Feb. 28, 2018	Aug. 31, 2017	Feb. 28, 2017	Aug. 31, 2016
Convertible Notes
Interest Expense				$ 221,000	$ 224,000
Senior Secured Convertible Notes due August 15 2018
Convertible Notes
Stated interest rate (as a percent)	8.00%		10.00%
Principal amount			$ 8,000,000	9,700,000
Conversion price (in dollars per share)	$ 4.25		$ 8.50
Redemption purchase price (as a percent)	100.00%	120.00%
Minimum ownership percentage triggering event for redemption of notes			40.00%
Maximum amount of indebtedness subordinated by security interest and cash payment rights under debt instruments			$ 5,000,000
Remaining unamortized debt discount				18,000
Senior Secured Convertible Notes due August 15 2018 | Contractual obligations and other termination costs
Convertible Notes
Debt issuance costs			$ 100,000
Interest Expense				12,000	$ 11,000
Remaining unamortized debt discount				$ 18,000
Senior Secured Convertible Notes due August 15 2018 | Maximum
Convertible Notes
Period for outstanding balance of accounts receivable has not recorded an allowance for doubtful accounts (in days)			90 days
Senior Secured Convertible Notes due August 15 2018 | Minimum
Convertible Notes
Percentage of beneficial ownership if effective upon conversion date of debt instrument			9.90%
Interest Note
Convertible Notes
Conversion price (in dollars per share)				$ 4.25
Number of shares issuable if notes converted to shares of common stock				2,271,338
Semi-annual interest payments						$ 463,000	$ 434,000	$ 420,000	$ 336,000

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The percentage of beneficial ownership if effective upon the applicable conversion date of debt instrument.

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The maximum amount of indebtedness subordinated by security interest and cash payment rights under the convertible debt instruments.

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The number of shares of common stock that the holder of the debt instrument would receive if the debt was converted to common stock.

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The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments applied to interest.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense.

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