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Equity Incentive Plans and Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of shares available for grant | 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.
Schedule of stock option activity | 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 |
Weighted-average assumptions for employee stock purchase plan |
| 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
Schedule of nonvested equity stock and stock units activity | 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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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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