STOCK OPTIONS (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Summary of stock options and stock awards

The status of our stock options and warrants are summarized as follows:

	Number of options and warrants		Weighted average exercise price
Outstanding at December 31, 2016	3,526,287		$	3.17
Granted	1,728,000		3.09
Exercised	(176,750	)	2.41
Canceled and forfeited	(443,302	)	3.95
Outstanding at December 31, 2017	4,634,235		$	3.10
Granted	225,000		2.40
Exercised	(1,378,615	)	2.43
Canceled and forfeited	(225,841	)	2.10
Outstanding at December 31, 2018	3,254,779		$	3.18
Granted	1,379,500		7.70
Exercised	(410,635	)	2.99
Canceled and forfeited	(256,785	)	4.76
Outstanding at December 31, 2019	3,966,858		$	4.67

Number of weighted average grant-date fair values of options

	Number of options		Weighted average grant date fair value
Non-vested at December 31, 2018	1,436,429		$	1.68
Granted	1,379,500		4.57
Vested	(1,119,000	)	1.90
Forfeited	(212,000	)	2.31
Non-vested at December 31, 2019	1,484,929		$	4.11

Schedule of option fair value assumptions

Inputs used in the valuation models are as follows:

	2019 Grants			2018 Grants			2017 Grants
Option value	$7.15	-	$7.91	$1.46	-	$3.04	$1.73	-	$2.34
Risk-free rate	1.7%	-	2.6%	1.9%	-	2.5%	1.5%	-	1.9%
Expected dividend yield	—%			—%			—%
Expected volatility	64.9%	-	66.4%	60.9%	-	68.8%	62.1%	-	68.0%
Expected term (in years)	4.5	-	6	6			6