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Share-based Compensation | 6 Months Ended
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Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Share-based Compensation | (9) Share-based Compensation The Company’s 2013 Stock Incentive Plan (as amended, the “2013 Equity Plan”) authorizes the issuance of various types of share-based awards to the Company’s employees, officers, directors, and other eligible participants. As of June 30, 2019, a total of 2,300,000 shares of the Company’s class A common stock were authorized for issuance under the 2013 Equity Plan. As of June 30, 2019, there were 572,500 shares of class A common stock reserved and available for future issuance under the 2013 Equity Plan. Stock option awards During the three months ended June 30, 2019, stock options to purchase an aggregate of 22,500 shares of class A common stock were granted pursuant to the 2013 Equity Plan. As of June 30, 2019, there were options to purchase 1,458,733 shares of class A common stock outstanding under the 2013 Equity Plan. The following table summarizes the Company’s stock option activity (in thousands, except per share data and years) for the three months ended June 30, 2019:
|  | Stock Options Outstanding |
|  |  |  |  |  | Weighted Average |  |  | Aggregate |  |  | Weighted Average |
|  |  |  |  |  | Exercise Price |  |  | Intrinsic |  |  | Remaining Contractual |
|  | Shares |  |  | Per Share |  |  | Value |  |  | Term (Years) |
Balance as of April 1, 2019 |  |  | 1,460 |  |  | $ | 137.38 |  |  |  |  |  |  |  |  |
Granted |  |  | 23 |  |  | $ | 133.62 |  |  |  |  |  |  |  |  |
Exercised |  |  | (3 | ) |  | $ | 131.53 |  |  | $ | 38 |  |  |  |  |
Forfeited/Expired |  |  | (21 | ) |  | $ | 156.14 |  |  |  |  |  |  |  |  |
Balance as of June 30, 2019 |  |  | 1,459 |  |  | $ | 137.05 |  |  |  |  |  |  |  |  |
Exercisable as of June 30, 2019 |  |  | 842 |  |  | $ | 136.98 |  |  | $ | 12,676 |  |  |  | 5.8 |
Expected to vest as of June 30, 2019 |  |  | 617 |  |  | $ | 137.15 |  |  | $ | 6,823 |  |  |  | 8.7 |
Total |  |  | 1,459 |  |  | $ | 137.05 |  |  | $ | 19,499 |  |  |  | 7.0 |
Stock options outstanding as of June 30, 2019 are comprised of the following range of exercise prices per share (in thousands, except per share data and years):
|  | Stock Options Outstanding at June 30, 2019 |
|  |  |  |  |  | Weighted Average |  |  | Weighted Average |
|  |  |  |  |  | Exercise Price |  |  | Remaining Contractual |
Range of Exercise Prices per Share |  | Shares |  |  | Per Share |  |  | Term (Years) |
$119.02 - $140.00 |  |  | 1,161 |  |  | $ | 126.51 |  |  |  | 7.1 |
$140.01 - $160.00 |  |  | 30 |  |  | $ | 145.41 |  |  |  | 9.7 |
$160.01 - $180.00 |  |  | 113 |  |  | $ | 167.75 |  |  |  | 5.7 |
$180.01 - $201.25 |  |  | 155 |  |  | $ | 191.97 |  |  |  | 7.2 |
Total |  |  | 1,459 |  |  | $ | 137.05 |  |  |  | 7.0 |
An aggregate of 40,625 stock options with an aggregate fair value of $2.4 million vested during the three months ended June 30, 2019. The weighted average grant date fair value of stock option awards using the Black-Scholes pricing model was $48.84 and $50.76 for each share subject to a stock option granted during the three months ended June 30, 2019 and 2018, respectively, based on the following assumptions:
|  | Three months ended |
|  | June 30, |
|  | 2019 |  |  | 2018 |
Expected term of options in years |  | 6.3 |  |  | 6.3 |
Expected volatility |  | 33.2% - 33.3% |  |  | 34.6% - 34.9% |
Risk-free interest rate |  | 2.0% -2.3% |  |  | 2.7% -2.8% |
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
For the three and six months ended June 30, 2019, the Company recognized approximately $3.0 million and $6.0 million, respectively, in share-based compensation expense from stock options granted under the 2013 Equity Plan. For the three and six months ended June 30, 2018, the Company recognized approximately $3.4 million and $8.1 million, respectively, in share-based compensation expense from stock options granted under the 2013 Equity Plan. As of June 30, 2019, there was approximately $28.4 million of total unrecognized share-based compensation expense related to unvested stock options. The Company expects to recognize this remaining share-based compensation expense over a weighted average vesting period of approximately 2.7 years. Included in this amount is approximately $4.2 million of total unrecognized share-based compensation expense related to unvested stock options that have been or will be forfeited in connection with the departures of two executive officers in July 2019. Prior to their departures, such amount was expected to be recognized over a remaining service period of approximately 2.8 years. Other stock-based awards During the three months ended June 30, 2019, the Company did not grant any “other stock-based awards” under the 2013 Equity Plan. For each of the three and six months ended June 30, 2019 and 2018, the Company did not recognize a material amount in share-based compensation expense from other stock-based awards. As of June 30, 2019, there was approximately $0.4 million of total unrecognized share-based compensation expense related to other stock-based awards. The Company expects to recognize this remaining share-based compensation expense over a weighted average vesting period of approximately 2.9 years, subject to additional fair value adjustments through the earlier of settlement or expiration.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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