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Derivative Liability and Fair Value Measurements (Estimate the fair value of warrants outstanding) (Detail) - Monte Carlo Options Lattice Pricing Model Warrants Outstanding - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Assumptions for Pricing Model:
Expected term in years	4 months 6 days	7 months 2 days
Volatility range for years	145.00%	143.00%
Risk-free interest rate	2.09%	1.76%
Expected annual dividends	0.00%	0.00%
Value of warrants outstanding:
Fair value of warrants	$ 124,794	$ 152,927

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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