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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions | The fair value of each stock option award granted during the years ended December 31, 2020 and 2019 was estimated as of the grant date using a trinomial lattice model. Weighted average assumptions used during the years ended December 31, 2021, 2020, and 2019 are as follows:
| 2021 |  | 2020 |  | 2019
Expected term (in years) | 1.2 – 5.5 |  | 3.8 – 5.5 |  | 3.0 – 5.5
Risk-free interest rate (%) | 0.7 | % |  | 0.7 | % |  | 2.4 | %
Expected volatility (%) | 45.1 | % |  | 42.7 | % |  | 43.2 | %
Dividend yield (%) | — |  |  | — |  |  | — |
Weighted average fair value/share at grant date | $ | 18.87 |  |  | $ | 8.88 |  |  | $ | 5.77 |
Share-based Compensation, Stock Options, Activity | The status of the stock options are summarized as follows:
| Number of Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2018 | 6,839,417 |  |  | $ | 7.63 |
Granted | 969,720 |  |  | 19.70 |
Exercised | (2,309,451) |  |  | 6.83 |
Forfeited | (180,927) |  |  | 13.34 |
Outstanding at December 31, 2019 | 5,318,759 |  |  | 9.97 |
Granted | 845,120 |  |  | 28.33 |
Exercised | (2,310,934) |  |  | 7.96 |
Forfeited | (67,004) |  |  | 16.37 |
Outstanding at December 31, 2020 | 3,785,941 |  |  | 15.21 |
Granted | 1,232,056 |  |  | 42.13 |
Exercised | (1,372,564) |  |  | 9.97 |
Forfeited | (684,238) |  |  | 29.70 |
Outstanding at December 31, 2021 | 2,961,195 |  |  | 25.46 |
Exercisable at December 31, 2021 | 1,668,356 |  |  | 15.29 |
Schedule of Nonvested Share Activity | The number and weighted average grant-date fair values of options non-vested at the beginning and end of 2021, as well as options granted, vested, and forfeited during the year were as follows:
| Number of Options |  | Weighted Average Grant Date Fair Value
Non-vested at December 31, 2020 | 2,163,809 |  |  | $ | 6.07 |
Granted | 1,232,056 |  |  | 18.87 |
Vested | (1,421,042) |  |  | 8.17 |
Forfeited | (681,984) |  |  | 9.58 |
Non-vested at December 31, 2021 | 1,292,839 |  |  | 13.93 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable | The following table summarizes information about the options outstanding at December 31, 2021:
|  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices ($) |  | Number Outstanding |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price
7.27 – 8.21 |  | 638,040 |  |  | 0.95 |  | $ | 7.86 |  |  | 638,040 |  |  | 0.95 |  | $ | 7.86 |
8.22 – 19.76 |  | 701,148 |  |  | 1.89 |  | 15.53 |  |  | 618,439 |  |  | 1.80 |  | 15.07 |
19.77 – 27.97 |  | 359,217 |  |  | 4.85 |  | 24.22 |  |  | 112,799 |  |  | 4.68 |  | 23.30 |
27.98 – 43.49 |  | 612,500 |  |  | 5.59 |  | 31.47 |  |  | 298,980 |  |  | 5.19 |  | 28.57 |
43.50 – 55.40 |  | 650,290 |  |  | 6.33 |  | 48.46 |  |  | 98 |  |  | 5.99 |  | 55.40 |
|  | 2,961,195 |  |  | 3.79 |  | 25.46 |  |  | 1,668,356 |  |  | 2.28 |  | 15.29 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The number of shares and weighted average grant date fair values of restricted non-vested common stock at the beginning and end of 2021, 2020, and 2019, as well as stock awards granted, vested, and forfeited during the year were as follows:
| Number of Restricted Shares |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2018 | 282,508 |  |  | $ | 9.01 |
Granted | 230,980 |  |  | 19.93 |
Vested | (115,711) |  |  | 9.36 |
Forfeited | (62,479) |  |  | 12.53 |
Nonvested at December 31, 2019 | 335,298 |  |  | 15.75 |
Granted | 149,012 |  |  | 28.45 |
Vested | (184,127) |  |  | 12.90 |
Forfeited | (8,292) |  |  | 20.75 |
Nonvested at December 31, 2020 | 291,891 |  |  | 23.82 |
Granted | 936,648 |  |  | 39.52 |
Vested | (213,777) |  |  | 32.83 |
Forfeited | (163,359) |  |  | 38.58 |
Nonvested at December 31, 2021 | 851,403 |  |  | 36.00 |

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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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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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