Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 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 fiscal years ended December 31, 2018 and 2017, the fair value of each stock option award was estimated using the Black-Scholes option-pricing model using the following assumptions:

	2018			2017
Risk-free interest rate		2.64-2.89	%		1.89% to 2.2	%
Expected dividend yield		0	%		0	%
Expected volatility		186.07-222.64	%		132.87% to 184.92	%
Expected life at date of issuance		5 years			4.55-5 years

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

At December 31, 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.

	December 31,
	2018		2017
Series B convertible preferred stock		11		11
Convertible notes payable		16,319		32,941
Common stock warrants		1,783,229		1,464,415
Common stock options		4,344,994		3,996,167
Total		6,144,553		5,493,534