STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2020

The fair values of stock options granted for the periods were estimated using the following assumptions:



	Stock Option Grants Awarded During the Six Months Ended June 30, 2020	Stock Option Grants Awarded During the Six Months Ended June 30, 2019
Stock Price	$1.74 to $2.58	$1.52 to $3.15
Dividend Yield	0.00%	0.00%
Expected Volatility	70% to 80%	70%
Risk-free interest rate	0.47% to 1.52%	1.92% - 2.62%
Expected Life	7 years	7 years

The following is a summary of our stock option activity during the six months ended June 30, 2020:



	Number of Options		Weighted Average Exercise Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Life In Years
Outstanding, January 1, 2020	1,340,252		$	4.57	$	2.88	6.95
Granted	60,500		2.19		1.56		9.85
Exercised	—		—		—		—
Canceled / Forfeited	(225,992	)	4.29		2.81		—
Outstanding, June 30, 2020	1,174,760		$	4.50	$	2.83	6.03



	Number of Options		Weighted Average Exercise Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Life In Years
Exercisable, January 1, 2020	989,092		$	4.85	$	3.03	6.37
Vested	73,693		3.70		2.36		5.44
Exercised	—		—		—		—
Canceled / Forfeited	(107,958	)	4.72		3.04		—
Exercisable, June 30, 2020	954,827		$	4.78	$	2.98	5.40

The following table presents information related to stock options outstanding and exercisable at June 30, 2020:



Options Outstanding		Options Exercisable
Exercise Price	Outstanding Number of Options	Weighted Average Remaining Life In Years	Exercisable Number of Options
$1.52 – $3.15	321,058	5.72	183,071
$3.25 – $4.92	464,772	6.17	406,053
$5.01 – $6.00	230,500	4.54	216,633
$6.18 – $7.20	68,130	4.46	62,510
$7.54 – $7.80	67,800	3.40	64,060
$8.06 – $12.98	22,500	4.55	22,500
	1,174,760	5.40	954,827

A summary of restricted stock unit activity for the six months ended June 30, 2020 is as follows:



	Number of Restricted Share Units		Weighted- Average Grant-Date Fair Value Per Share
Outstanding at January 1, 2020	2,556,004		$	3.38
Granted	2,304,059		1.91
Vested	(851,356	)	2.89
Forfeited	(362,739	)	2.62
Outstanding at June 30, 2020	3,645,968		$	2.64

Total stock-based compensation recorded in the condensed consolidated statements of comprehensive loss is allocated as follows:



	Three Months Ended June 30, 2020		Three Months Ended June 30, 2019		Six Months Ended June 30, 2020		Six Months Ended June 30, 2019
Research and development	$	870,000	$	690,000	$	1,518,000	$	1,323,000
Sales, marketing and administration	741,000		767,000		1,472,000		1,488,000
Total stock-based compensation	$	1,611,000	$	1,457,000	$	2,990,000	$	2,811,000