STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Stock option activity

				Weighted Average
	Options on					Remaining		Aggregate
	Common			Exercise		Contractual		Intrinsic
	Shares			Price		Term		Value
Outstanding January 1, 2019		2,067,500		$	1.68		4.44	$	3,063,375
Granted		1,000,000			5.41		5.00		-
Exercised		(16,250	)		1.50		-		-
Forfeited, cancelled, expired		(75,000	)		1.50		-		-
Outstanding June 30, 2019		2,976,250		$	2.94		4.21	$	9,757,700
Vested and exercisable at June 30, 2019		1,208,438		$	1.58		3.92	$	5,611,323

Assumptions used to compute the fair value of options granted

	Six Months
	Ended
	June 30,
	2019
Expected stock price volatility		49	%
Risk-free interest rate		2.41	%
Forfeiture rate		0	%
Expected dividend yield		0	%
Expected life of options - years		3.50
Weighted-average fair value of options granted	$	2.06

Service-based RSU activity

	Service-Based		Grant Date		Vesting
	RSU's		Fair Value		Period
Unvested at January 1, 2019		-
Granted at May 23, 2019		263,087	$	7.24	3 Years
Vested		-
Forfeited and cancelled		-
Unvested at June 30, 2019		263,087

Stock-based compensation

	For the Three Months				For the Six Months
	Ended June 30,				Ended June 30,
	2019		2018		2019		2018
Selling, general and administrative	$	345,217	$	125,878	$	548,417	$	125,878
Research and development		28,634		47,095		52,481		47,095
Total stock-based expense	$	373,851	$	172,973	$	600,898	$	172,973

Warrant activity

	Number			Average Purchase Price Per Share
Shares purchasable under outstanding warrants at January 1, 2019		5,017,181		$	4.82
Stock purchase warrants issued		2,076,922		$	6.62
Stock purchase warrants exercised		(336,317	)	$	4.63
Shares purchasable under outstanding warrants at June 30, 2019		6,757,786		$	5.38

Summary of stock purchase warrants

	Number of		Exercise Price
Description	Common Shares		Per Share		Expiration Date
Purchase Warrants (1)		4,286,907	$	5.00	October 30, 2020
Agent Warrants		393,957	$	3.00	October 30, 2020
Purchase Warrants		1,923,076	$	6.50	June 18, 2021
Agent Warrants		153,846	$	8.125	June 18, 2021

(1)333,334 warrants are held by a family trust of officer Elwood G. Norris.