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Share-based Compensation | 9 Months Ended
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Sep. 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 September 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 September 30, 2019, there were 677,500 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 September 30, 2019, no stock option awards were granted pursuant to the 2013 Equity Plan. As of September 30, 2019, there were options to purchase 1,326,233 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 September 30, 2019:
|  | Stock Options Outstanding |
|  |  |  |  |  | Weighted Average |  |  | Aggregate |  |  | Weighted Average |
|  |  |  |  |  | Exercise Price |  |  | Intrinsic |  |  | Remaining Contractual |
|  | Shares |  |  | Per Share |  |  | Value |  |  | Term (Years) |
Balance as of July 1, 2019 |  |  | 1,459 |  |  | $ | 137.05 |  |  |  |  |  |  |  |  |
Granted |  |  | 0 |  |  | $ | 0 |  |  |  |  |  |  |  |  |
Exercised |  |  | (27 | ) |  | $ | 131.14 |  |  | $ | 287 |  |  |  |  |
Forfeited/Expired |  |  | (106 | ) |  | $ | 135.28 |  |  |  |  |  |  |  |  |
Balance as of September 30, 2019 |  |  | 1,326 |  |  | $ | 137.32 |  |  |  |  |  |  |  |  |
Exercisable as of September 30, 2019 |  |  | 842 |  |  | $ | 137.96 |  |  | $ | 15,742 |  |  |  | 5.5 |
Expected to vest as of September 30, 2019 |  |  | 484 |  |  | $ | 136.20 |  |  | $ | 7,870 |  |  |  | 8.5 |
Total |  |  | 1,326 |  |  | $ | 137.32 |  |  | $ | 23,612 |  |  |  | 6.6 |
Stock options outstanding as of September 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 September 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 |  |  | 1,058 |  |  | $ | 126.05 |  |  |  | 6.7 |
$140.01 - $160.00 |  |  | 0 |  |  | $ | 0 |  |  |  | 0.0 |
$160.01 - $180.00 |  |  | 113 |  |  | $ | 167.75 |  |  |  | 5.4 |
$180.01 - $201.25 |  |  | 155 |  |  | $ | 191.97 |  |  |  | 6.9 |
Total |  |  | 1,326 |  |  | $ | 137.32 |  |  |  | 6.6 |
An aggregate of 27,500 stock options with an aggregate fair value of $1.8 million vested during the three months ended September 30, 2019. No stock option awards were granted during the three months ended September 30, 2019. The weighted average grant date fair value of stock option awards using the Black-Scholes pricing model was $50.57 for each share subject to a stock option granted during the three months ended September 30, 2018 based on the following assumptions:
|  | Three months ended |
|  | September 30, |
|  | 2018 |
Expected term of options in years |  | 6.3 |
Expected volatility |  |  | 34.5 | %
Risk-free interest rate |  |  | 2.9 | %
Expected dividend yield |  |  | 0.0 | %
For the three and nine months ended September 30, 2019, the Company recognized approximately $1.8 million and $7.8 million, respectively, in share-based compensation expense from stock options granted under the 2013 Equity Plan. For the three and nine months ended September 30, 2018, the Company recognized approximately $3.0 million and $11.1 million, respectively, in share-based compensation expense from stock options granted under the 2013 Equity Plan. As of September 30, 2019, there was approximately $21.0 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 2.5 years. Other stock-based awards During the three months ended September 30, 2019, the Company did not grant any “other stock-based awards” under the 2013 Equity Plan. For each of the three and nine months ended September 30, 2019 and 2018, the Company did not recognize a material amount of share-based compensation expense from other stock-based awards. As of September 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 2.7 years, subject to additional fair value adjustments through the earlier of settlement or expiration.

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- Definition The entire disclosure for share-based payment arrangement. + 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 + Details
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