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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity and Weighted Average Exercise Prices | A summary of the Company’s stock option activity and weighted average exercise prices follows:
| Stock Option Activity |  | Weighted Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In thousands)
| Options (In thousands) |  | Weighted Average Exercise Price |  |
Balances outstanding at December 31, 2020 | 4,332 |  |  | $ | 19.78 |  |  | 6.79 |  | $ | 183,825 |
Granted | 472 |  |  |  |  |  |  |
Exercised | (461) |  |  |  |  |  |  |
Cancelled or expired | (88) |  |  |  |  |  |  |
Balances outstanding at June 30, 2021 | 4,255 |  |  | 24.21 |  |  | 6.85 |  | 166,339 |
Options vested and expected to vest | 1,187 |  |  | 32.09 |  |  | 8.25 |  | 37,185 |
Options exercisable at June 30, 2021 | 2,448 |  |  | $ | 16.58 |  |  | 5.66 |  | $ | 114,235 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | A summary of the Company’s restricted stock unit (“RSU”) activity and weighted average exercise prices follows:
| Restricted Stock Unit Activity |  |
| Number of Shares (In thousands) |  | Weighted Average Grant Date Fair Value (Per share) |  | Aggregate Fair Value (In thousands)
Balances outstanding at December 31, 2020 | 2,950 |  |  | $ | 27.00 |  |  | $ | 183,781 |
Awarded | 1,565 |  |  |  |  |
Vested | (1,244) |  |  |  |  |
Forfeited | (250) |  |  |  |  |
Non-vested and outstanding at June 30, 2021 | 3,021 |  |  | $ | 38.46 |  |  | $ | 191,205 |
Expected to vest | 1,841 |  |  | $ | 36.30 |  |  | $ | 116,404 |
Weighted Average Assumptions of Fair Value Options Using Black-Scholes Option-Pricing Model | The fair value of each option grant is estimated on the date of grant, adjusted for estimated forfeitures, using the Black-Scholes option-pricing model with the following weighted average assumptions:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Dividend yield | 0.00% |  | 0.00% |  | 0.00% |  | 0.00%
Risk-free interest rate | 0.77% -0.84% |  | 0.31% - 0.32% |  | 0.46% - 0.84% |  | 0.31% - 0.66%
Expected life (in years) | 5 |  | 5 |  | 5 |  | 5
Historical volatility | 54.31% - 54.55% |  | 51.91% - 51.94% |  | 53.94% - 54.55% |  | 46.50% - 51.94%

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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