STOCK-BASED COMPENSATION

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

Under our stock option plans, our board of directors may grant options to purchase common shares to our key employees, officers, directors and consultants. We account for stock options in accordance with FASB ASC Topic 718, Compensation - Stock Compensation, with option expense amortized over the vesting period based on the trinomial lattice option-pricing model fair value on the grant date, which includes a number of estimates that affect the amount of our expense. We expensed approximately $377,000 and $749,000 in stock-based compensation during the three and six months ended June 30, 2018, as compared with $182,000 and $341,000 for the three and six months ended June 30, 2017, respectively.

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

	Number of options		Weighted average exercise price
Outstanding at December 31, 2017	4,860,157		$	3.00
Granted	117,000		2.95
Exercised	(37,250	)	2.23
Canceled and forfeited	(57,500	)	6.55
Outstanding at June 30, 2018	4,882,407		$	2.94

Common shares required to be issued upon the exercise of stock options and warrants would be issued from our authorized and unissued shares. We calculated the fair value of issued options utilizing a trinomial lattice with an expected life calculated via the simplified method as we do not have sufficient history to determine actual expected life.

	2018 Grants
Option value	$	1.46	-	$	1.96
Risk-free rate	1.9%
Expected dividend yield	—
Expected volatility	68.8%
Expected term (in years)	6