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WARRANTS (Tables)

6 Months Ended

Jun. 30, 2020

Schedule of common stock warrants outstanding

The following table summarizes information about common stock warrants outstanding at June 30, 2020:

Outstanding								Exercisable
				Weighted
				Average		Weighted				Weighted
				Remaining		Average				Average
Exercise		Number		Contractual		Exercise		Number		Exercise
Price		Outstanding		Life (Years)		Price		Exercisable		Price
$ —		6,500		3.75		$ —		6,500		$ —
$ 0.88		281,250		4.77		$ 0.88		—		$ 0.88
$ 1.07		400,000		4.91		$ 1.07		400,000		$ 1.07
$ 1.14		144,928		4.69		$ 1.14		—		$ 1.14
$ 1.16		95,238		4.91		$ 1.16		—		$ 1.16
$ 1.17		157,143		4.79		$ 1.17		157,143		$ 1.17
$ 1.19		277,778		4.66		$ 1.19		—		$ 1.19
$ 1.21		90,909		4.81		$ 1.21		—		$ 1.21
$ 1.43		270,198		4.61		$ 1.43		—		$ 1.43
$ 2.43		361,991		1.41		$ 2.43		361,991		$ 2.43
$ 8.00		397		1.34		$ 8.00		397		$ 8.00
$ 8.80		25,000		4.01		$ 8.80		25,000		$ 8.80
$ 12.00		12,500		3.86		$ 12.00		12,500		$ 12.00
$ 19.80		15,555		3.75		$ 19.80		15,555		$ 19.80
$ 440.00		355		2.36		$ 440.00		355		$ 440.00
$ 480.00		94		2.84		$ 480.00		94		$ 480.00
$ 528.00		186		2.34		$ 528.00		186		$ 528.00
$ 560.00		2,657		2.37		$ 560.00		2,657		$ 560.00
$ 600.00		170		1.87		$ 600.00		170		$ 600.00
$ 640.00		200		1.82		$ 640.00		200		$ 640.00
$ 752.00		9,614		2.88		$ 752.00		9,614		$ 752.00
$ 800.00		350		2.44		$ 800.00		350		$ 800.00
$ 880.00		947		1.17		$ 880.00		947		$ 880.00
$ 920.00		2,126		2.74		$ 920.00		2,126		$ 920.00
$ 1,040.00		1,243		2.79		$ 1,040.00		1,243		$ 1,040.00
$ 1,760.00		781		2.56		$ 1,760.00		781		$ 1,760.00
$ 1,800.00		140		2.57		$ 1,800.00		140		$ 1,800.00
$ 2,000.00		203		2.57		$ 2,000.00		203		$ 2,000.00
$ 0.88 - $ 2,000.00		2,158,453		4.16		$ 8.88		998,152		$ 17.85

Schedule of option pricing

The Company utilized the Black-Scholes option pricing model and the assumptions used during the six months ended June 30, 2020 and 2019:

		Six Months Ended
		June 30, 2020		June 30, 2019
Weighted average risk free interest rate		0.17% — 1.38%		2.18% — 2.28%
Weighted average life (in years)		1.42 — 5		5.0
Volatility		86.3% — 103.1%		87.5%
Expected dividend yield		0%		0%
Weighted average grant-date fair value per share of warrants granted		$ 0.78		$ 10.48