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STOCKHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2018
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 six months ended June 30, 2018 and 2017 are set forth in the table below.
|  | Six Months Ended June 30, 2018 |  | Six Months Ended June 30, 2017
Risk-free interest rate |  |  | 2.38-2.63% |  |  |  | 1.84-2.01% |
Volatility |  |  | 61.82-64.04% |  |  |  | 61.56-63.95% |
Term (in years) |  |  | 5.1-6.25 |  |  |  | 5.5-6.25 |
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Schedule of 2009 and 2012 Plans activity | 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, 2017 |  |  | 23,365,225 |  |  | $ | 3.78 |  |  |  | 5.13 |  |  | $ | 64,664,821 |
Granted |  |  | 2,315,500 |  |  | $ | 5.26 |  |  |  |  |  |  |  |  |
Exercised |  |  | (404,576 | ) |  | $ | 2.79 |  |  |  |  |  |  | $ | 1,386,827 |
Expired/Forfeited |  |  | (62,250 | ) |  | $ | 7.61 |  |  |  |  |  |  |  |  |
Balance at June 30, 2018 |  |  | 25,210,899 |  |  | $ | 3.92 |  |  |  | 5.16 |  |  | $ | 69,013,547 |
Vested and Exercisable at |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 30, 2018 |  |  | 20,565,025 |  |  | $ | 3.46 |  |  |  | 4.30 |  |  | $ | 66,096,342 |
Unvested at June 30, 2018 |  |  | 4,645,874 |  |  | $ | 5.98 |  |  |  | 8.96 |  |  | $ | 2,917,204

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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