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STOCK-BASED COMPENSATION | 9 Months Ended
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Sep. 30, 2017
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 $191,000 and $532,000 in stock-based compensation during the three and nine months ended September 30, 2017, respectively, as compared with $173,000 and $533,000 for the three and nine months ended September 30, 2016. The status of our stock options and stock awards are summarized as follows:
| Number of options |  | Weighted average exercise price
Outstanding at December 31, 2016 | 3,752,209 |  |  | $ | 3.04 |
Granted | 628,000 |  |  | 3.26 |
Exercised | (104,500 | ) |  | 2.64 |
Canceled and forfeited | (196,803 | ) |  | 4.99 |
Outstanding at September 30, 2017 | 4,078,906 |  |  | $ | 2.99 |
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.
| 2017 Grants
Option value | $ | 1.73 |  | - | $ | 2.34 |
Risk-free rate | 1.5%
Expected dividend yield | —%
Expected volatility | 68.0%
Expected term (in years) | 6

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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