Debt instrument default interest rate.

No definition available.

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- Definition

Percentage of remaining outstanding unconverted principal payment obligation upon change of control.

+ References

No definition available.

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- Definition

Qualified financing gross proceeds threshold.

+ References

No definition available.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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- Definition

Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

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- Definition

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

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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- Definition

Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature.

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- Definition

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

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- Definition

The average effective interest rate during the reporting period.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

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.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Represents the charge against earnings during the period for commitment fees and debt issuance expenses.

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- Definition

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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- Definition

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

+ References

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- Definition

Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in CCYY-MM-DD format.

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- Definition

Fair value portion of warrants not settleable in cash classified as equity.

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Related Party Convertible Notes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	May 30, 2018	Jun. 15, 2017
Debt Instrument [Line Items]
Amortization of the issuance costs		$ 141	$ 25
Debt instrument, convertible, beneficial conversion feature		1,007
2018 Warrant
Debt Instrument [Line Items]
Estimated fair value of warrant	$ 743	$ 743
2018 Senior Unsecured Convertible Promissory Note
Debt Instrument [Line Items]
Debt principal amount				$ 1,750
Interest rate during period		10.00%
Interest rate during default	16.00%	16.00%
Maturity Date		May 30, 2023
Interest expense	$ 44	$ 58
Debt instrument, convertible, beneficial conversion feature		$ 1,200
Debt instrument, effective interest rate	26.40%	26.40%
Amortization of debt discount	$ 70	$ 95
Interest expense derived from issuance costs	$ 0	85
2018 Senior Unsecured Convertible Promissory Note and Warrant
Debt Instrument [Line Items]
Debt instrument, convertible, beneficial conversion feature		$ 1,000
Chess Deposit Interest \| 2018 Warrant
Debt Instrument [Line Items]
Warrant to purchase CDIs				97,222,200
Warrant initial exercise price per CDI				$ 0.018
Warrant expiration date				May 30, 2023
Chess Deposit Interest \| 2018 Senior Unsecured Convertible Promissory Note
Debt Instrument [Line Items]
Debt instrument conversion ratio		0.02
Debt instrument conversion description		The entire outstanding principal balance under the 2018 Note and all unpaid accrued interest thereon is convertible into CHESS Depositary Interests (“CDIs”), each representing 1/50th of a share of the Company’s common stock, at the option of the Purchaser at a conversion price of $0.018 per CDI. In the event that the Borrower issues additional CDIs in a subsequent equity financing at a price per CDI that is less than $0.018 the conversion price of the 2018 Note will adjust to the lower CDI conversion price. In addition, upon a change of control of the Company, the Purchaser may demand prepayment of accrued and unpaid interest plus 110% of the remaining outstanding unconverted principal balance of the 2018 Note.
Debt instrument conversion price per CDI	$ 0.018	$ 0.018
Percentage of remaining outstanding unconverted principal payment obligation upon change of control	110.00%	110.00%
2017 Senior Secured Convertible Promissory Note
Debt Instrument [Line Items]
Debt principal amount					$ 5,000
Interest rate during period		5.00%
Interest rate during default	8.00%	8.00%
Maturity Date		Dec. 31, 2018
Debt issuance costs					$ 115
Interest expense	$ 67	$ 191
Amortization of the issuance costs	$ 19	56
2017 Senior Secured Convertible Promissory Note \| Chess Deposit Interest
Debt Instrument [Line Items]
Qualified financing least amount raised		$ 10,000