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Equity Incentive Plans and Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Equity Incentive Plans and Stock-Based Compensation | Equity Incentive Plans and Stock-Based Compensation A summary of shares available for grant under the Company’s plans is as follows:
|  | Shares Available for Grant
Total shares available for grant as of December 31, 2020 |  | 12,412,320
Stock options forfeited |  | 51,477
Nonvested equity stock and stock units granted (1) (2) |  | (3,369,905)
Nonvested equity stock and stock units forfeited (1) |  | 1,155,509
Total shares available for grant as of June 30, 2021 |  | 10,249,401
_________________________________________ (1) For purposes of determining the number of shares available for grant under the 2015 Equity Incentive Plan (the “2015 Plan”) against the maximum number of shares authorized, each restricted stock granted reduces the number of shares available for grant by 1.5 shares and each restricted stock forfeited increases shares available for grant by 1.5 shares. (2) Amount includes approximately 0.4 million shares that have been reserved for potential future issuance related to certain performance unit awards granted in the first quarter of 2021 and discussed under the section titled “Nonvested Equity Stock and Stock Units” below. General Stock Option Information The following table summarizes stock option activity under the Company’s equity incentive plans for the six months ended June 30, 2021 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of June 30, 2021.
|  | Options Outstanding |  |  |  |
(In thousands, except per share amounts and years) |  | Number of Shares |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding as of December 31, 2020 |  | 964,211 |  | $ | 11.08 |  |  |  |  |
Options granted |  | — |  | $ | — |  |  |  |  |
Options exercised |  | (99,458) |  | $ | 11.29 |  |  |  |  |
Options forfeited |  | (51,477) |  | $ | 15.09 |  |  |  |  |
Outstanding as of June 30, 2021 |  | 813,276 |  | $ | 10.80 |  |  | 4.5 |  | $ | 10,497 |
Vested or expected to vest at June 30, 2021 |  | 812,918 |  | $ | 10.80 |  |  | 4.4 |  | $ | 10,493 |
Options exercisable at June 30, 2021 |  | 728,233 |  | $ | 10.54 |  |  | 4.1 |  | $ | 9,590 |
Employee Stock Purchase Plan Under the 2015 Employee Stock Purchase Plan (“2015 ESPP”), the Company issued 263,933 shares at a price of $11.58 per share and 277,838 shares at a price of $10.51 per share during the six months ended June 30, 2021 and 2020, respectively. As of June 30, 2021, approximately 2.9 million shares under the 2015 ESPP remained available for issuance. Stock-Based Compensation For the six months ended June 30, 2021 and 2020, the Company maintained stock plans covering a broad range of potential equity grants including stock options, nonvested equity stock and equity stock units and performance based instruments. In addition, the Company sponsors the 2015 ESPP, whereby eligible employees are entitled to purchase common stock semi-annually, by means of limited payroll deductions, at a 15% discount from the fair market value of the common stock as of specific dates. Stock Options There were no stock options granted during the three and six months ended June 30, 2021 and 2020, respectively. During the three and six months ended June 30, 2021, the Company recorded stock-based compensation expense related to stock options of $0.1 million and $0.2 million, respectively. During the three and six months ended June 30, 2020, the Company recorded stock-based compensation expense related to stock options of $0.1 million and $0.3 million, respectively. As of June 30, 2021, there was $0.7 million of total unrecognized compensation cost, net of expected forfeitures, related to non-vested stock-based compensation arrangements granted under the stock option plans. That cost is expected to be recognized over a weighted-average period of 1.6 years. Employee Stock Purchase Plan For the three and six months ended June 30, 2021, the Company recorded stock-based compensation expense related to the 2015 ESPP of $0.2 million and $0.8 million, respectively. For the three and six months ended June 30, 2020, the Company recorded stock-based compensation expense related to the 2015 ESPP of $0.2 million and $0.7 million, respectively. As of June 30, 2021, there was $0.4 million of total unrecognized compensation cost related to stock-based compensation arrangements granted under the 2015 ESPP. That cost is expected to be recognized over four months. Valuation Assumptions The fair value of stock awards is estimated as of the grant date using the Black-Scholes-Merton (“BSM”) option-pricing model assuming a dividend yield of 0% and the additional weighted-average assumptions as listed in the table below. There were no stock options granted during the three and six months ended June 30, 2021 and 2020, respectively.
| Employee Stock Purchase Plan
| Six Months Ended
| June 30,
| 2021 |  | 2020
Employee Stock Purchase Plan: |  |  |
Expected stock price volatility | 32% |  | 46%
Risk free interest rate | 0.04% |  | 0.12%
Expected term (in years) | 0.5 |  | 0.5
Weighted-average fair value of purchase rights granted under the purchase plan | $4.53 |  | $3.50
Nonvested Equity Stock and Stock Units The Company grants nonvested equity stock units to officers, employees and directors. During the three and six months ended June 30, 2021, the Company granted nonvested equity stock units totaling approximately 0.1 million and 2.0 million shares, respectively. During the three and six months ended June 30, 2020, the Company granted nonvested equity stock units totaling approximately 0.1 million and 1.9 million shares, respectively. These awards have a service condition, generally a service period of four years, except in the case of grants to directors, for which the service period is one year. For the three and six months ended June 30, 2021, the nonvested equity stock units were valued at the date of grant giving them a fair value of approximately $2.8 million and $41.3 million, respectively. For the three and six months ended June 30, 2020, the nonvested equity stock units were valued at the date of grant giving them a fair value of approximately $1.7 million and $29.3 million, respectively. During the first quarters of 2021 and 2020, the Company granted performance unit awards to certain Company executive officers with vesting subject to the achievement of certain performance and/or market conditions. The ultimate number of performance units that can be earned can range from 0% to 200% of target depending on performance relative to target over the applicable period. The shares earned will vest on the third anniversary of the date of grant. The Company’s shares available for grant have been reduced to reflect the shares that could be earned at the maximum target. For the three and six months ended June 30, 2021, the Company recorded stock-based compensation expense of approximately $7.0 million and $12.9 million, respectively, related to all outstanding nonvested equity stock grants. For the three and six months ended June 30, 2020, the Company recorded stock-based compensation expense of approximately $6.3 million and $11.8 million, respectively, related to all outstanding nonvested equity stock grants. Unrecognized stock-based compensation related to all nonvested equity stock grants, net of estimated forfeitures, was approximately $51.5 million at June 30, 2021. This amount is expected to be recognized over a weighted-average period of 2.3 years. The following table reflects the activity related to nonvested equity stock and stock units for the six months ended June 30, 2021:
Nonvested Equity Stock and Stock Units |  | Shares |  | Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2020 |  | 4,851,265 |  | $ | 12.82 |
Granted |  | 1,998,321 |  | $ | 20.68 |
Vested |  | (1,287,156) |  | $ | 12.35 |
Forfeited |  | (585,690) |  | $ | 15.01 |
Nonvested at June 30, 2021 |  | 4,976,740 |  | $ | 15.84 |

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