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Loans Payable - Summary of Significant Conversion Option Valuation Inputs and Results (Detail) - After Modification [Member] - Binomial Lattice Process [Member] | 9 Months Ended
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Sep. 30, 2018 $ / shares
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Underlying price on valuation date | $ 1.25
Contractual conversion rate | $ 1.00
Contractual term to maturity | 1 year 9 months 25 days
Implied expected term to maturity | 1 year 9 months 25 days
Market volatility: |
Equivalent market risk adjusted interest rates | 0.52%
Measurement Input, Price Volatility [Member] |
Market volatility: |
Equivalent volatilities/Risk free rates using zero coupon US Treasury Security rates | 1.201
Minimum [Member] | Measurement Input, Price Volatility [Member] |
Market volatility: |
Equivalent volatilities/Risk free rates using zero coupon US Treasury Security rates | 0.960
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member] |
Market volatility: |
Equivalent volatilities/Risk free rates using zero coupon US Treasury Security rates | 0.0029
Maximum [Member] | Measurement Input, Price Volatility [Member] |
Market volatility: |
Equivalent volatilities/Risk free rates using zero coupon US Treasury Security rates | 1.540
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member] |
Market volatility: |
Equivalent volatilities/Risk free rates using zero coupon US Treasury Security rates | 0.68

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