Explanation of Responses: |
(1) | These shares of common stock were acquired upon the vesting and settlement of certain restricted stock units. |
(2) | These shares were delivered to the issuer to pay for the applicable withholding tax due upon vesting of certain restricted stock units. |
(3) | Each restricted stock unit represents a contingent right to receive one share of common stock of the issuer. |
(4) | On February 12, 2016, these restricted stock units were granted in the original grant amount of 25,000, which vest in four equal annual installments, with a final vesting in 2020. |
(5) | This field is not applicable. |
(6) | On February 19, 2019, these restricted stock units were granted in the original amount of 8,942, which vest in three equal annual installments, with a final vesting in 2022. |
(7) | On February 23, 2018, these restricted stock units were granted in the original amount of 7,930, which vest in four equal annual installments, with a final vesting in 2022. |
(8) | On February 24, 2017, these restricted stock units were granted in the original amount of 11,222, which vest in four equal annual installments, with a final vesting in 2021. |
(9) | On February 25, 2016, these restricted stock units were granted in the original amount of 11,201, which vest in four equal annual installments, with a final vesting in 2020. |
(10) | On February 19, 2019, these stock options were granted in the original amount of 23,236, which vest in three equal annual installments, with a final vesting in 2022. |
(11) | On February 23, 2018, these stock options were granted in the original amount of 18,570, which vest in four equal annual installments, with a final vesting in 2022. |
(12) | On February 24, 2017, these stock options were granted in the original amount of 26,733, which vest in four equal annual installments, with a final vesting in 2021. |
(13) | On February 25, 2016, these stock options were granted in the original amount of 26,113, which vest in four equal annual installments, with a final vesting in 2020. |
(14) | On February 12, 2016, these stock options were granted in the original amount of 50,000, which vest in four equal annual installments, with a final vesting in 2020. |
(15) | On February 26, 2015, these stock options were granted in the original amount of 15,074, which vest in four equal annual installments, with a final vesting in 2019. |
(16) | On February 27, 2014, these stock options were granted in the original amount of 12,490, which vest in four equal annual installments, with a final vesting in 2018. |
(17) | On January 2, 2014, these stock options were granted in the original amount of 100,000, which vest in four equal annual installments, with a final vesting in 2018. |
(18) | On February 26, 2013, these stock options were granted in the original amount of 10,021, which vest in four equal annual installments, with a final vesting in 2017. |