Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation Expense

The following table sets forth the total stock-based compensation expense resulting from stock options, restricted stock and warrants included in our Condensed Consolidated Statements of Operations:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Research and development	$	—	$	—	$		$	(2,672	)
General and administrative — employee		86,659		214,706		173,321		427,880
Total employee stock-based compensation	$	86,659	$	214,706	$	173,321	$	425,208

Schedule of Share-based Compensation, Stock Options, Activity

Presented below is our stock option activity:

	Six Months Ended June 30, 2020
	Number of Options (Employees)			Number of Options (Non-Employees)		Total Number of Options			Weighted-Average Exercise Price
Outstanding at January 1, 2020		7,126,340			615,000		7,741,340		$	3.32
Granted		—			—		—			—
Forfeited or expired		(3,570	)		—		(3,570	)	$	32.76
Outstanding at June 30, 2020		7,122,770			615,000		7,737,770		$	3.31
Exercisable at June 30, 2020		7,075,104			615,000		7,690,104		$	3.32

Schedule of Ranges of Stock Options

The following table summarizes significant ranges of outstanding stock options under our plans at June 30, 2020:

Range of Exercise Prices		Number of Options		Weighted-Average Remaining Contractual Life (years)		Weighted-Average Exercise Price		Number of Options Exercisable		Weighted-Average Remaining Contractual Life (years)		Weighted-Average Exercise Price
$	0.26 – $1.00		5,400,000		9.46	$	0.26		5,400,000		9.46	$	0.26
$	1.01 – $3.00		1,050,673		7.11	$	2.04		1,003,007		7.00	$	2.04
$	3.01 – $15.00		852,360		4.47	$	12.56		852,360		4.47	$	12.56
$	15.01 –$42.42		434,737		3.44	$	26.13		434,737		3.44	$	26.13
			7,737,770		8.25	$	3.32		7,690,104		8.24	$	3.32