Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Fair Value of Stock Options Issued to Employees

The fair value of stock option issued to employees was estimated at the date of grant using Black-Scholes with the following weighted-average assumptions:

	For the Year Ended December 31,
	2019			2018
Expected volatility		92.68	%		92.14	%
Expected term (years)		5.89			6.07
Risk-free interest rate		2.17	%		2.86	%
Expected dividend yield		0.00	%		0.00	%

Schedule of Information Related to Stock Options Outstanding

A summary of stock option activities under the Plans is presented below:

	Number of Stock Options			Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term (Year)		Weighted- Average Intrinsic Value
Outstanding, January 1, 2019		353,274		$	10.97		6.04	$	-
Granted		725,000			2.67
Exercised		—						$	-
Forfeited or expired		(105,102	)		14.89
Outstanding, December 31, 2019		973,172		$	4.36		5.91	$	-
Exercisable, December 31, 2019		289,518		$	6.86		5.48	$	-
Expected to vest, December 31, 2019		594,779		$	3.30		6.09	$	-

Summary of Restricted Stock Activity

A summary of restricted stock activities is presented below:

	Shares			Weighted- average Grant Date Fair Value
Unvested, January 1, 2019		323,404		$	4.06
Vested		(87,738	)		4.58
Unvested, December 31, 2019		235,666		$	3.87

Schedule of Stock-based Compensation Expense

Stock-based compensation expense is classified in the accompanying consolidated statements of operations and comprehensive loss for the years ended December 31, 2019 and 2018 as follows:

	Year-Ended December 31,
	2019		2018
Research and development	$	356,718	$	319,354
General and administrative		907,513		453,894
Total	$	1,264,231	$	773,248