Stock Award Plans and Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Grant Date Fair Value

The assumptions underlying the calculation of grant date fair value per share are as follows:

	For the Three Months Ended March 31,
	2019		2018
Number of options granted		74,000		206,500
Volatility	61.35%-61.42%		62.08%
Risk-free interest rate	2.45%-2.50%		2.30-2.64%
Weighted-average expected option term (in years)	6.25		6.08
Dividend yield	—%		—%
Weighted-average fair value per share of grants	0.79		2.14

Schedule of Stock-based Compensation Expense

The Company recognized stock-based compensation expense related to the issuance of stock option awards to employees and non-employees, restricted stock awards to employees and directors, and restricted stock units to employees, in the statements of operations as follow:

	March 31,
	2019		2018
Research and development	$	27,138	$	31,658
Selling, general and administrative		180,467		304,697
Total	$	207,605	$	336,355