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STOCKHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2019
Stockholders' Equity: |
Schedule of assumptions used in the Black-Scholes Model of stock options |
| Six months ended June 30,
| 2019 |  | 2018
Risk-free interest rate | 2.19—2.54 % |  | 2.38—2.63 %
Volatility | 61.25—61.85 % |  | 61.82—64.04 %
Term (in years) | 5.5—6.25 |  | 5.1—6.25
Dividend yield | 0.00% |  | 0.00%
Schedule of activity of 2009 and 2012 Plans | A summary of activity under the 2009, 2012 and 2019 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 |  |  | 1,544,500 |  |  | $ | 4.40 |  |  |  |  |  |  |  |  |
Exercised |  |  | (288,480 | ) |  | $ | 0.35 |  |  |  |  |  |  | $ | 1,315,238 |
Expired/Forfeited |  |  | (56,375 | ) |  | $ | 5.77 |  |  |  |  |  |  |  |  |
Balance at June 30, 2019 |  |  | 22,072,469 |  |  | $ | 4.95 |  |  |  | 5.80 |  |  | $ | 3,945,665 |
Vested and Exercisable at June 30, 2019 |  |  | 17,125,888 |  |  | $ | 4.79 |  |  |  | 4.94 |  |  | $ | 3,945,665 |
Unvested at June 30, 2019 |  |  | 4,946,581 |  |  | $ | 5.48 |  |  |  | 8.79 |  |  | $ | 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=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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