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STOCKHOLDERS' EQUITY (Tables) | 3 Months Ended
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Mar. 31, 2015
Stockholders' Equity Note [Abstract] |
Schedule of assumptions used in the Black-Scholes Model of stock options | The assumptions used in the Black-Scholes Model during the three months ended March 31, 2015 and 2014 are set forth in the table below.
|  | Three Months Ended March 31, 2015 |  | Three Months Ended March 31, 2014
Risk-free interest rate |  |  | 1.47 | % |  |  | 1.70-1.75 | %
Volatility |  |  | 58.78-62.59 | % |  |  | 69.15-70.76 | %
Term (in years) |  |  | 5.27-6.25 |  |  |  | 5.5-6.25 |
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Schedule of option 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, 2014 |  |  | 16,792,443 |  |  | $ | 1.88 |  |  |  | 6.92 |  |  | $ | 43,996,311 |
Granted |  |  | 919,500 |  |  | $ | 5.92 |  |  |  |  |  |  |  |  |
Exercised |  |  | (11,250 | ) |  | $ | 0.64 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (114,584 | ) |  | $ | 2.82 |  |  |  |  |  |  |  |  |
Balance at March 31, 2015 |  |  | 17,586,109 |  |  | $ | 2.09 |  |  |  | 6.53 |  |  | $ | 69,714,593 |
Vested and Exercisable at March 31, 2015 |  |  | 13,701,873 |  |  | $ | 1.50 |  |  |  | 5.89 |  |  | $ | 62,312,047 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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