Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Stockholders' Equity Note [Abstract]

Summary of warrant activity

The following is a summary of warrant activity from December 31, 2018 to June 30, 2019:

					Weighted
			Weighted		Average
			Average		Remaining		Aggregate
	Warrants		Exercise		Contractual		Intrinsic
	Outstanding		Price		Life		Value
Outstanding, December 31, 2018		419,167	$	61.00		3.48	$	—
Granted		110,000		63.00
Forfeited		—
Exercised
Outstanding, June 30, 2019		529,167	$	61.00		2.98	$	—
Exercisable, June 30, 2019		525,167	$	62.00		2.97	$	—

Summary of exercise price for warrant outstanding

The exercise price for warrant outstanding and exercisable at June 30, 2019:

Outstanding			Exercisable
Number of		Exercise	Number of		Exercise
Warrants		Price	Warrants		Price
20,000	$	32.00	20,000	$	32.00
320,000		50.00	320,000		50.00
75,000		75.00	75,000		75.00
50,000		100.00	50,000		100.00
30,000		185.00	30,000		185.00
6,667		200.00	6,667		200.00
10,000		235.00	10,000		235.00
7,500		250.00	7,500		250.00
5,000		270.00	5,000		270.00
5,000		280.00	1,000		280.00
529,167			525,167

Schedule of Assumptions

The fair value of the warrants listed above was determined using the Black-Scholes option pricing model with the following assumptions:

	June 30,			December 31,
	2019			2018
Risk-free interest rate		2.49	%		2.65	%
Expected life of the options		5 years			5 years
Expected volatility		200	%		210	%
Expected dividend yield		0	%		0	%