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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2020
Stockholders' Equity Note [Abstract] |
Schedule of Stock Option and Restricted Stock Activity | Stock option and restricted stock activity for the Plans was as follows for the six months ended June 30, 2020:
|  |  | Options outstanding |  | Restricted stock outstanding
| Number of shares available for issuance under the Plans |  | Number of shares outstanding under the Plans |  | Weighted- average exercise price per share |  | Weighted- average remaining contractual term (In years) |  | Aggregate intrinsic value |  | Number of shares outstanding under the Plans |  | Weighted- average grant date fair value per share
Balance at December 31, 2019 | 66.2 |  |  | 2.0 |  |  | $ | 12.28 |  |  | 6.5 |  |  | $ | 16.40 |  |  | 30.7 |  |  | $ | 20.48 |
Additional shares authorized | 21.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Options exercised and RSUs released | — |  |  | (0.3 | ) |  | 4.77 |  |  | — |  |  | — |  |  | (6.1 | ) |  | 20.01 |
Options and RSUs canceled | 5.9 |  |  | (0.2 | ) |  | 17.40 |  |  | — |  |  | — |  |  | (5.8 | ) |  | 20.25 |
Shares repurchased for tax withholdings on release of restricted stock units and awards | 2.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 20.00 |
Restricted stock and options granted | (20.8 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | 20.8 |  |  | 18.64 |
Balance at June 30, 2020 | 75.2 |  |  | 1.5 |  |  | $ | 13.37 |  |  | 6.2 |  |  | $ | 12.70 |  |  | 39.6 |  |  | $ | 19.62 |
Vested at June 30, 2020 |  |  | 1.0 |  |  | $ | 16.47 |  |  | 5.5 |  |  | $ | 6.30 |  |  | — |  |  | $ | — |
Unvested at June 30, 2020 |  |  | 0.5 |  |  | $ | 5.55 |  |  |  |  | $ | 6.40 |  |  | 39.6 |  |  | $ | 19.62 |
Schedule of Pre-Tax Intrinsic Value | The following table summarizes information about the pre-tax intrinsic value of options exercised during the three and six months ended June 30, 2020 and 2019:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Intrinsic value of options exercised | $ | 3.0 |  |  | $ | 1.4 |  |  | $ | 4.8 |  |  | $ | 4.5 |
Fair Value of Stock Options Assumptions Used | The fair value of stock options assumed were estimated using the following assumptions:
Expected volatility | 51.6 | %
Expected term (in years) | 3.4 - 7.0 |
Risk-free interest rate | 2.42% - 2.51% |
Dividend yield | — | %

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