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Convertible Notes - Additional Information (Detail) - USD ($)			1 Months Ended			3 Months Ended
	Feb. 18, 2018	Feb. 17, 2018	Feb. 28, 2019	Oct. 31, 2018	Mar. 31, 2016	Mar. 31, 2019	Mar. 31, 2018
Debt Instrument [Line Items]
Stated interest rate						8.00%
Interest expense						$ 54,000	$ 221,000
Senior Secured Convertible Notes due August 15 2018
Debt Instrument [Line Items]
Principal amount					$ 8,000,000
Stated interest rate				8.00%	10.00%
Minimum ownership percentage triggering event for redemption of notes					40.00%
Redemption purchase price	100.00%	120.00%
Maximum amount of indebtedness subordinated by security interest and cash payment rights under debt instruments					$ 5,000,000
Payment on principle amount of note				$ 7,400,000
Senior Secured Convertible Notes due August 15 2018 | Contractual obligations and other termination costs
Debt Instrument [Line Items]
Debt issuance costs					$ 100,000
Interest expense						0	$ 12,000
Senior Secured Convertible Notes due August 15 2018 | Minimum
Debt Instrument [Line Items]
Percentage of beneficial ownership if effective upon conversion date of debt instrument					19.90%
Senior Secured Convertible Notes due August 15 2018 | Maximum
Debt Instrument [Line Items]
Period for outstanding balance of accounts receivable has not recorded an allowance for doubtful accounts					90 days
Senior Secured Convertible Notes due August 15, 2023
Debt Instrument [Line Items]
Conversion price				$ 0.5717	$ 8.50
Outstanding Notes payable						$ 2,700,000
Interest Note
Debt Instrument [Line Items]
Conversion price						$ 0.5717
Semi-annual interest payments			$ 78,000
Number of shares issuable if notes converted to shares of common stock						4,808,626
Beneficial ownership ceiling						9.90%

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

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The period for outstanding balance of accounts receivable has not recorded an allowance for doubtful accounts pledged under the debt instrument conversion features, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Debt Instrument Convertible Number Of Shares Of Common Stock

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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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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Percentage of principal amount of debt redeemed.

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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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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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