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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Summary of Warrants Issued and Outstanding

The following table summarizes the warrants issued and outstanding as of December 31, 2019:

Warrants Issued and Outstanding as of December 31, 2019

Date of

Exercise

Shares of

Description

Issuance

Expiration

Price

Common Stock

Exercisable warrants

Warrants

3/30/2016

3/30/2021

$

3.88

521,060

Total warrants issued and outstanding

521,060

Summary of Stock Option Activity

The following table summarizes the stock option activity from January 1, 2018 through December 31, 2019:

		Stock Options
								Weighted-
						Exercise		Average
		Number				Price Per		Exercise Price
		of Shares				Share		Per Share
Outstanding at January 1, 2018			1,389,816			$1.17 — $26.00		$	8.39
Granted			420,500			$1.65  —  $2.62		$	2.38
Canceled/Forfeited			(37,250	)		$2.39 — $23.20		$	5.98
Outstanding at December 31, 2018			1,773,066			$1.17 — $26.00		$	7.02
Granted			1,074,515			$1.51  —  $3.12		$	1.93
Canceled/Forfeited			(402,128	)		$1.51 — $26.00		$	15.64
Outstanding at December 31, 2019			2,445,453			$1.17 — $23.20		$	3.37

Summary of Stock Option Outstanding

The following additional information applies to options outstanding at December 31, 2019:

Range of Exercise Prices		Outstanding at December 31, 2019				Weighted- Average Remaining Contractual Life				Weighted- Average Exercise Price				Exercisable at December 31, 2019				Weighted- Average Exercise Price
$1.17 - $23.20			2,445,453				7.6			$	3.37				1,209,087			$	4.47

The following additional information applies to options outstanding at December 31, 2018:

Range of Exercise Prices		Outstanding at December 31, 2018				Weighted- Average Remaining Contractual Life				Weighted- Average Exercise Price				Exercisable at December 31, 2018				Weighted- Average Exercise Price
$1.17 - $26.00			1,773,066				6.9			$	7.02				999,999			$	10.05

Schedule of Weighted-Average Estimated Value of Employee Stock Options Granted

The weighted-average estimated value of employee stock options granted during the years ended December 31, 2019 and 2018 were estimated using the Black-Scholes-Merton option pricing model with the following weighted-average assumptions:

		Years Ended December 31,
		2019				2018
Expected volatility			76	%			85	%
Risk-free interest rate			2.37	%			2.42	%
Expected dividends			0.00	%			0.00	%
Expected term in years			5.8				5.9

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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