Stockholders Deficit (Tables)

9 Months Ended

Sep. 30, 2019

A summary of the Company’s stock option activity for the nine months ended September 30, 2019 is as follows:

	Number of Shares			Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Balance at December 31, 2018		2,047,237		$	3.07		7.6	$	366,007
Granted		1,227,500			1.50
Exercised		(54,256	)		2.23			$	21,380
Forfeited		(62,946	)		3.26
Expired/Cancelled		(216,545	)		3.38
Balance at September 30, 2019		2,940,990		$	2.41		8.2	$	-
Exercisable at September 30, 2019		1,300,596		$	2.90		6.6	$	1,621

Summary of Restricted Stock Unit ("RSU") Plans Activity

A summary of restricted stock unit (“RSU”) activity for the nine months ended September 30, 2019 is as follows:

	Number of Shares			Weighted- Average Grant Date Fair Value Per Share
Balance at December 31, 2018		227,707		$	3.39
Granted		77,500			1.93
Released		(58,128	)		3.30
Balance at September 30, 2019		247,079		$	2.95
Vested and unissued at September 30, 2019		15,001		$	3.26

Summary of Stock-Based Compensation

Stock-based compensation expense recorded in the accompanying condensed consolidated statements of operations for the three and nine months ended September 30, 2019 and 2018 was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Selling, general and administrative	$	226,645	$	200,317	$	625,821	$	1,475,975
Research and development		74,652		41,553		181,336		121,651
Cost of product and product-related services revenue		15,258		16,105		37,976		45,727
	$	316,555	$	257,975	$	845,133	$	1,643,353