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Share-based Compensation | 3 Months Ended
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Mar. 31, 2020
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 March 31, 2020, 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 March 31, 2020, there were 391,850 shares of class A common stock reserved and available for future issuance under the 2013 Equity Plan. Stock option awards As of March 31, 2020, there were options to purchase 1,600,533 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 March 31, 2020:
|  | Stock Options Outstanding |
|  |  |  |  |  | Weighted Average |  |  | Aggregate |  |  | Weighted Average |
|  |  |  |  |  | Exercise Price |  |  | Intrinsic |  |  | Remaining Contractual |
|  | Shares |  |  | Per Share |  |  | Value |  |  | Term (Years) |
Balance as of January 1, 2020 |  |  | 1,634 |  |  | $ | 141.60 |  |  |  |  |  |  |  |  |
Granted |  |  | 0 |  |  | $ | 0 |  |  |  |  |  |  |  |  |
Exercised |  |  | (3 | ) |  | $ | 130.85 |  |  | $ | 53 |  |  |  |  |
Forfeited/Expired |  |  | (30 | ) |  | $ | 152.22 |  |  |  |  |  |  |  |  |
Balance as of March 31, 2020 |  |  | 1,601 |  |  | $ | 141.41 |  |  |  |  |  |  |  |  |
Exercisable as of March 31, 2020 |  |  | 925 |  |  | $ | 137.95 |  |  | $ | 0 |  |  |  | 4.9 |
Expected to vest as of March 31, 2020 |  |  | 676 |  |  | $ | 146.13 |  |  | $ | 0 |  |  |  | 9.0 |
Total |  |  | 1,601 |  |  | $ | 141.41 |  |  | $ | 0 |  |  |  | 6.7 |
Stock options outstanding as of March 31, 2020 are comprised of the following range of exercise prices per share (in thousands, except per share data and years):
|  | Stock Options Outstanding at March 31, 2020 |
|  |  |  |  |  | Weighted Average |  |  | Weighted Average |
|  |  |  |  |  | Exercise Price |  |  | Remaining Contractual |
Range of Exercise Prices per Share |  | Shares |  |  | Per Share |  |  | Term (Years) |
$119.02 - $140.00 |  |  | 941 |  |  | $ | 125.65 |  |  |  | 5.6 |
$140.01 - $160.00 |  |  | 412 |  |  | $ | 152.21 |  |  |  | 9.6 |
$160.01 - $180.00 |  |  | 95 |  |  | $ | 169.07 |  |  |  | 5.0 |
$180.01 - $201.25 |  |  | 153 |  |  | $ | 192.11 |  |  |  | 6.3 |
Total |  |  | 1,601 |  |  | $ | 141.41 |  |  |  | 6.7 |
An aggregate of 99,375 stock options with an aggregate fair value of $5.6 million vested during the three months ended March 31, 2020. No stock option awards were granted during the three months ended March 31, 2020. The weighted average grant date fair value of stock option awards using the Black-Scholes pricing model was $54.85 for each share subject to a stock option granted during the three months ended March 31, 2019, based on the following assumptions:
|  | Three months ended |
|  | March 31, |
|  | 2019 |
Expected term of options in years |  |  | 6.3 |
Expected volatility |  |  |  | 33.4 | %
Risk-free interest rate |  |  |  | 2.5 | %
Expected dividend yield |  |  |  | 0.0 | %
For the three months ended March 31, 2020 and 2019, the Company recognized approximately $3.2 million and $3.0 million, respectively, in share-based compensation expense from stock options granted under the 2013 Equity Plan. As of March 31, 2020, there was approximately $32.7 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 3.0 years. Other stock-based awards During the three months ended March 31, 2020, the Company did not grant any “other stock-based awards” under the 2013 Equity Plan. For each of the three months ended March 31, 2020 and 2019, the Company did not recognize a material amount of share-based compensation expense from other stock-based awards. As of March 31, 2020, there was approximately $0.2 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 2.2 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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