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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2018
STOCK-BASED COMPENSATION |
Schedule of valuation assumptions |
|  | Three Months Ended |  |
|  | March 31, |  |
|  | 2018 |  | 2017 |  |
Option Plan Shares |  |  |  |  |  |
Risk-free interest rates |  | 2.79% |  | 2.13% |  |
Expected term (in years) |  | 6.44 |  | 6.59 |  |
Expected volatility |  | 61.8% |  | 62.9% |  |
Dividend yield |  | 0% |  | 0% |  |
Weighted average fair value per share of options granted during the period |  | $26.84 |  | $13.20 |  |
Summary of stock option activity under the Stock Plans |
|  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  | Weighted |  | Average |  |  |  |
|  |  |  | Average |  | Remaining |  | Aggregate |
|  |  |  | Exercise |  | Contractual |  | Intrinsic |
Options |  | Shares |  | Price |  | Term (Years) |  | Value(1) |
(Aggregate intrinsic value in thousands) |  |  |  |  |  |  |  |  |  |  |
Outstanding, January 1, 2018 |  | 3,360,461 |  | $ | 11.89 |  | 6.4 |  |  |  |
Granted |  | 343,566 |  |  | 44.37 |  |  |  |  |  |
Exercised |  | (420,129) |  |  | 3.31 |  |  |  |  |  |
Forfeited |  | — |  |  | — |  |  |  |  |  |
Outstanding, March 31, 2018 |  | 3,283,898 |  | $ | 16.39 |  | 7.0 |  | $ | 80,098 |
Exercisable, March 31, 2018 |  | 1,757,384 |  | $ | 10.80 |  | 5.4 |  | $ | 51,901 |
| (1) |  | The aggregate intrinsic value of options outstanding, exercisable and vested and expected to vest is calculated as the difference between the exercise price of the underlying options and the market price of the Company’s common stock for options that had exercise prices that were lower than the $40.33 market price of the Company’s common stock at March 31, 2018. The total intrinsic value of options exercised during the three months ended March 31, 2018 and 2017 was $19.1 million and $0.2 million, respectively.
Summary of restricted stock and restricted stock unit activity under the Stock Plans |
|  |  |  | Weighted |
|  | Restricted |  | Average Grant |
|  | Shares |  | Date Fair Value |
Outstanding, January 1, 2018 |  | 6,148,778 |  | $ | 15.76 |
Granted |  | 1,079,223 |  |  | 45.16 |
Released |  | (880,022) |  |  | 17.67 |
Forfeited |  | (33,307) |  |  | 26.37 |
Outstanding, March 31, 2018 |  | 6,314,672 |  | $ | 20.36 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options and employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + 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://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 Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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