Stock-Based Compensation (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2019

Dec. 31, 2018

Share-based Payment Arrangement [Abstract]

Summary of Stock Option Activity

The following represents a summary of the options granted to employees and non-employees that are outstanding at September 30, 2019 and changes during the period then ended:

		Options				Weighted Average Exercise Price				Aggregate Intrinsic Value				Weighted Average Remaining Contractual Life (in years)
Outstanding at December 31, 2018			673,885			$	19.82			$	―				8.2
Granted			698,750			$	0.62			$	―				9.0
Exercised/ Expired/ Forfeited			(28,500	)		$	0.98			$	―				―
Outstanding at September 30, 2019			1,344,135			$	10.24			$	―				8.4
Exercisable at September 30, 2019			531,528			$	28.66			$	―				7.4

The following represents a summary of the options granted to employees and non-employees that are outstanding at December 31, 2018 and changes during the period then ended:

		Number of Shares				Weighted- Average Exercise Price				Aggregate Intrinsic Value				Weighted- Average Remaining Contractual Life (in years)
Outstanding at December 31, 2017			254,171			$	47.43			$	―				7.3
Options granted			456,718				3.16				―				8.6
Options forfeited			(37,004	)			3.90				―				―
Outstanding at December 31, 2018			673,885				19.82				―				8.2
Exercisable at December 31, 2018			290,818			$	50.19			$	―				6.9

Schedule of Assumptions Used in Black-Scholes Option-Pricing Method

The material factors incorporated in the Black-Scholes model in estimating the fair value of the options granted for the periods presented were as follows (three months ended September 30, 2018 stock price adjusted for 1-for-10 reverse stock split):

		For the three months ended September 30,								For the nine months ended September 30,
		2019				2018				2019				2018
Expected dividend yield			0.00	%			0.00	%			0.00	%			0.00	%
Expected stock-price volatility			69.00% – 69.38	%			48.89% – 50.22	%			46.33% – 69.38	%			46.47% – 53.11	%
Risk-free interest rate			1.47% – 1.54	%			2.78% – 3.07	%			1.47% – 2.60	%			2.46% – 3.07	%
Expected average term of options			5 –7				7 – 10				5 – 7				5 – 10
Stock price		$	1.04			$	1.85 – $2.22			$	0.60 – $1.04			$	1.85 – $3.40

The material factors incorporated in the Black-Scholes model in estimating the fair value of the options granted for the periods presented were as follows (adjusted for 1-for-10 reverse stock split):

		For the year ended December 31,
		2018				2017
Expected dividend yield			0.00	%			0.00	%
Expected stock-price volatility			46.47% - 53.11	%			53.08% - 54.08	%
Risk-free interest rate			2.46% - 3.07	%			1.89% - 2.58	%
Term of options			5 - 10				10
Stock price		$	1.85 - $3.40			$	0.30 - $3.48

Schedule of Nonvested Restricted Stock Units

The following table summarizes restricted stock unit activity for the nine months ended September 30, 2019:

		Number of Units				Weighted Average Grant Date Fair Value
Unvested at December 31, 2018			1,100,000			$	2.73
Granted			35,000				0.63
Forfeited			―				―
Expired			(35,000	)			0.63
Unvested at September 30, 2019			1,100,000			$	2.73