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STOCKHOLDERS' EQUITY (Tables) | 3 Months Ended
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Mar. 31, 2019
Stockholders' Equity: |
Schedule of assumptions used in the Black-Scholes Model of stock options | The assumptions used in the Black-Scholes Model for options granted during the three months ended March 31, 2019 and 2018 are set forth in the table below.
|  | Three Months Ended March 31, 2019 |  |  | Three Months Ended March 31, 2018 |
Risk-free interest rate |  |  | 2.54 | % |  |  | 2.38-2.60 | %
Volatility |  |  | 61.85 | % |  |  | 63.59-64.04 | %
Term (in years) |  |  | 6.25 |  |  |  | 6-6.25 |
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Schedule of activity of 2009 and 2012 Plans | A summary of activity under the 2009 and 2012 Plans and related information follows:
|  | Number of Shares Underlying Stock Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life in Years |  |  | Aggregate Intrinsic Value |
Balance at December 31, 2018 |  |  | 20,872,824 |  |  | $ | 4.93 |  |  |  | 5.94 |  |  | $ | 12,239,876 |
Granted |  |  | 907,000 |  |  | $ | 5.63 |  |  |  |  |  |  |  |  |
Exercised |  |  | (288,480 | ) |  | $ | 0.35 |  |  |  |  |  |  | $ | 1,315,238 |
Expired/Forfeited |  |  | (43,625 | ) |  | $ | 5.69 |  |  |  |  |  |  |  |  |
Balance at March 31, 2019 |  |  | 21,447,719 |  |  | $ | 5.02 |  |  |  | 5.93 |  |  | $ | 19,747,182 |
Vested and Exercisable at March 31, 2019 |  |  | 16,995,263 |  |  | $ | 4.78 |  |  |  | 5.16 |  |  | $ | 19,747,182 |
Unvested at March 31, 2019 |  |  | 4,452,456 |  |  | $ | 5.93 |  |  |  | 8.83 |  |  | $ | 0 |

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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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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