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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
	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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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