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Cumulative operating losses.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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Management's Plans - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
Management's Plans - Additional Information (Detail)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) Employee shares	Dec. 31, 2018 Employee
Financial Support For Nonconsolidated Legal Entity [Line Items]
Cumulative operating losses	$ 10,000,000		$ 10,000,000
Gain (loss) on litigation	405,000	$ (505,000)	405,000	$ (505,000)
Number of full time employees \| Employee					19
Promissory Notes [Member]
Financial Support For Nonconsolidated Legal Entity [Line Items]
Repayments of notes payable including accrued interest and other costs					$ 4,720,860
Debt Instrument, due					2018-04
Repayments of notes payable, in exchange of common shares \| shares					2,953,189
Repayments of notes					$ 717,500
Senior Secured Convertible Note [Member]
Financial Support For Nonconsolidated Legal Entity [Line Items]
Principal amount	$ 500,000		500,000
Scenario, Forecast [Member]
Financial Support For Nonconsolidated Legal Entity [Line Items]
Number of full time employees \| Employee						10
Litigation Reversal [Member]
Financial Support For Nonconsolidated Legal Entity [Line Items]
Gain (loss) on litigation			405,000
Insurance Reimbursement for Legal Fees [Member]
Financial Support For Nonconsolidated Legal Entity [Line Items]
Gain (loss) on litigation			$ 200,000