Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Summary of Fair Value of Option Estimated Using Black-Scholes Pricing Model with Valuation Assumptions

For stock options requiring an assessment of value during the nine months ended September 30, 2017, the fair value of each stock option award was estimated using the Black-Scholes option-pricing model using the following assumptions:

Risk-free interest rate	1.83% to 1.92	%
Expected dividend yield	0	%
Expected volatility	132.87	%
Expected life	4.833 years

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

At September 30, 2018 and 2017, the Company excluded the outstanding securities summarized below, which entitle the holders thereof to acquire shares of common stock, from its calculation of earnings per share, as their effect would have been anti-dilutive.

	September 30,
	2018		2017
Series B convertible preferred stock		11		11
Convertible notes payable		16,061		32,239
Common stock warrants		1,703,229		985,915
Common stock options		4,323,317		2,046,749
Total		6,042,618		3,064,914