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Equity Incentive Plans and Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
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
Shares available as of December 31, 2019 | 6,826,863 |
Increase in shares approved for issuance (3) | 7,800,000 |
Stock options granted | — |
Stock options forfeited | 57,836 |
Nonvested equity stock and stock units granted (1) (2) | (3,358,046) |
Nonvested equity stock and stock units forfeited (1) | 803,481 |
Total available for grant as of June 30, 2020 | 12,130,134 |
_________________________________________ (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 share of restricted stock granted reduces the number of shares available for grant by 1.5 shares and each share of restricted stock forfeited increases shares available for grant by 1.5 shares. (2)Amount includes approximately 0.5 million shares that have been reserved for potential future issuance related to certain performance unit awards granted in the first quarter of 2020 and discussed under the section titled “Nonvested Equity Stock and Stock Units” below. (3)On April 30, 2020, the Company’s stockholders approved an additional 7,800,000 shares for issuance under the 2015 Plan. | [1]
Schedule of stock option activity | The following table summarizes stock option activity under the 2015 Plan for the six months ended June 30, 2020 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of June 30, 2020.
|  | 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, 2019 |  | 1,639,146 |  |  | $ | 11.37 |  |  |  |  |
Options granted |  | — |  |  | $ | — |  |  |  |  |
Options exercised |  | (473,170) |  |  | $ | 10.48 |  |  |  |  |
Options forfeited |  | (57,836) |  |  | $ | 18.73 |  |  |  |  |
Outstanding as of June 30, 2020 |  | 1,108,140 |  |  | $ | 11.36 |  |  | 4.86 |  | $ | 4,495 |
Vested or expected to vest at June 30, 2020 |  | 1,105,704 |  |  | $ | 11.36 |  |  | 4.85 |  | $ | 4,490 |
Options exercisable at June 30, 2020 |  | 889,527 |  |  | $ | 10.98 |  |  | 4.08 |  | $ | 3,996 |
Weighted-average assumptions for employee stock purchase plan |
| Employee Stock Purchase Plan |  |
| Six Months Ended |  |
| June 30, |  |
| 2020 |  | 2019
Employee Stock Purchase Plan: |  |  |
Expected stock price volatility | 46 | % |  | 32 | %
Risk free interest rate | 0.12 | % |  | 2.44 | %
Expected term (in years) | 0.5 |  | 0.5
Weighted-average fair value of purchase rights granted under the purchase plan | $ | 3.50 |  |  | $ | 2.80 |
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, 2020:
Nonvested Equity Stock and Stock Units |  | Shares |  | Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2019 |  | 5,289,483 |  |  | $ | 11.27 |
Granted |  | 1,872,547 |  |  | $ | 15.65 |
Vested |  | (1,330,009) |  |  | $ | 11.38 |
Forfeited |  | (431,636) |  |  | $ | 11.50 |
Nonvested at June 30, 2020 |  | 5,400,385 |  |  | $ | 12.75 |
[1] | Amount includes approximately 0.5 million shares that have been reserved for potential future issuance related to certain performance unit awards granted in the first quarter of 2020 and discussed under the section titled “Nonvested Equity Stock and Stock Units” below.

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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=116856206&loc=d3e5070-113901 + Details
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