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STOCK-BASED COMPENSATION PLANS (Tables) | 9 Months Ended
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Sep. 30, 2019
STOCK-BASED COMPENSATION PLANS |
Fair Value of Stock Options Grants | The Company used the Black Scholes option pricing model to determine the fair value of stock option grants, using the following assumptions for the three and nine months ended September 30, 2019 and 2018.
|  | For the Three Months |  | For the Nine Months |
|  | Ended September 30, |  | Ended September 30, |
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Expected term (years) |  | 6.25 |  | 6.25 |  | 6.25 |  | 6.25 |
Risk-free interest rate |  | 1.83 | % | 2.78 | % | 2.34 | % | 2.78 | %
Expected volatility |  | 121.58 | % | 123.05 | % | 121.83 | % | 123.05 | %
Expected dividend yield |  | — | % | — | % | — | % | — | %
Summary of Stock Option Activity Under the Option Plan | A summary of stock option activity under all equity compensation plans for the nine months ended September 30, 2019, is presented below:
|  |  |  |  |  |  | Weighted- |  |  |
|  |  |  |  |  |  | Average |  |  |
|  |  |  | Weighted- |  | Remaining |  | Aggregate
|  | Number of |  | Average |  | Contractual |  | Intrinsic
|  | Shares |  | Exercise |  | Term |  | Value
|  | (in thousands) |  | Price |  | (Years) |  | (in thousands)
Outstanding at December 31, 2018 |  | 1,885 |  | $ | 0.80 |  | 6.3 |  | $ | 4,085
Granted |  | 616 |  | $ | 5.62 |  |  |  |  |
Expired |  | (7) |  |  | 1.00 |  |  |  |  |
Forfeited |  | (115) |  | $ | 2.47 |  |  |  |  |
Exercised |  | (253) |  | $ | 0.68 |  |  |  |  |
Outstanding at September 30, 2019 |  | 2,126 |  | $ | 2.12 |  | 6.6 |  | $ | 15,720
Exercisable at September 30, 2019 |  | 1,171 |  | $ | 0.43 |  | 4.7 |  | $ | 10,626
Restricted Stock Award Activity Under all Equity Compensation Plans | A summary of restricted stock award activity under all equity compensation plans for the nine months ended September 30, 2019, is presented below:
|  | Number of
|  | Shares
|  | (in thousands)
Granted but not vested at December 31, 2018 |  | 76
Granted |  | 45
Forfeited |  | —
Vested |  | (21)
Granted but not vested at September 30, 2019 |  | 100

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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